🎥七年級自然習作直播教學：南一Ch2習作練習題

What are you talking about? Please listen to what I'm saying. What? Good night, online students. Welcome to "Natural and Simple." I'm Teacher Scon. I will finish explaining all the exercises in Chapter 2 today. Today's class is the West Seat for the male first-year student, the junior-level seventh West Seat. The substances that make up cells are composed of molecules such as water, carbohydrates, proteins, and lipids. I'll provide a导读 (reading guide) for the key points of Chapter Two. The elements of carbohydrates are carbon, hydrogen (H), oxygen (O), nitrogen (N), and sulfur (S). Glucose has the chemical formula C6H12O6, and eggs are one of the primary sources of protein. These are the elements our cells require: carbon, hydrogen, oxygen, nitrogen, and sulfur, CHONS. Okay, is the audio clear? Since this is my first time using this teaching method, I'm not sure how everyone's audio reception is. Alright, next let's look at the breakdown of macromolecules. Some large molecules cannot be absorbed and utilized by our cells, so they must be absorbed through the process of digestion. When it comes to this type of carbohydrate, such as starch and cellulose, they break down into glucose. That is, starch is a large molecule, and our cells cannot use it after we ingest it. Cellulose is also a macromolecule, which our cells cannot use; humans cannot utilize it either. Proteins can be broken down into amino acids, which are one of the essential substances required by cells and are very important. But some herbivores can break down this cellulose into glucose. Therefore, starch cellulose is a macromolecule that breaks down into glucose. Moreover, regarding that lipid, it breaks down into fatty acids and glycerol. As for lipids, they can be broken down into fatty acids and glycerol. Therefore, these small molecules can be absorbed and utilized by cells. What is diffusion? When we drop a single drop of ink into water, how does it naturally behave? This process, in which the entire bath of water becomes dyed blue, is called diffusion. Its direction of diffusion is the movement from a region of higher concentration to a region of lower concentration, which is known as diffusion. Therefore, diffusion itself does not require energy; it is a natural phenomenon that occurs spontaneously in nature. So if a student sprays perfume in the classroom, you'll notice everyone can smell it—why is that? Since the fragrance naturally disperses, apart from cases like us, sometimes you might say, Why did you pour a cup of ink into that swimming pool, yet it didn't turn black? Because the amount of your ink is insufficient; although it does spread, the quantity is too small, so after spreading, it becomes less noticeable. Alright, then what about this—what is meant by penetration? That is a plant cell, and the outer part here is the plant cell wall. It refers to the diffusion of water through a cell membrane, which is called osmosis. Therefore, osmosis is a phenomenon concerning water passing through a cell membrane. You place the plant cell wall in a concentrated saline solution, Am I the one blocking your way? Sorry, I'm moving my head away. My head is so annoying. Alright, come over here. Alright, what I just said is that this is osmosis—it's the diffusion of water through a cell membrane. When I soaked this plant's cells in concentrated saline solution, then It shrinks inward, which is the cell membrane; the cell membrane shrinks, but the shape of the cell wall remains unchanged. This one is placed in physiological saline; at this point, the water concentration is equivalent. Thus, water also exits and water also enters, maintaining a dynamic balance. As for distilled water, if there's less water inside and more water outside, osmosis will cause water to move inward. Once it penetrates inside, the plant will become more inflated. So its cell wall has already become bent throughout, and the cell membrane completely fills the cell wall with no gaps. When you compare that with this concentrated saline solution, the cell membrane will shrink, and water will all seep out. Now let's look at the ways substances enter and exit cells—the concept map of our cell membrane. And this water seeping in, these two can be compared. If there's no head, it won't work; without a head, it's as if no one is watching you during class, right? Having a head on makes me feel like the teacher is still watching over me. As for how substances enter and exit cells, it is controlled by the cell membrane. Some small molecules can freely pass through, such as gases or water molecules. What gas does it contain? It contains oxygen and carbon dioxide. Some large molecules, such as glucose and various nutrients and minerals we mentioned. Therefore, oxygen and carbon dioxide can pass through the cell membrane directly via this method without requiring special channels. Water molecules can also freely enter and exit this cell. There will be some water that can enter and exit the cell through this special structure. That diagram illustrates a concept: specifically, how our water molecules undergo the process of osmosis. Some small molecules, such as water molecules or certain gas molecules, can freely pass through and permeate in. Allow oxygen to permeate in and allow carbon dioxide to permeate out and be expelled. That means it uses this special channel to allow certain substances to enter and exit. It sounds a bit choppy when I speak. The starch, proteins, and fats are too large; they are too big molecules and therefore cannot get in. Alright, now carbon dioxide and water can directly enter and exit. Glucose, amino acids, minerals, and water must pass in and out of the cell through specific protein channels. This is a way substances enter and exit cells. You stay right here. Now I know which way to direct my vote. Alright, let's continue. Move it to the lower-left corner; it's least likely to get stuck. In this case, it's physiological saline, distilled water, and frozen saline. When our red blood cells are placed in physiological saline, because the water concentration outside is the same as inside. I can't seem to post pictures here. Thus, water diffuses in and water also diffuses out. Water渗透 in, and water also渗透 out. It maintains a balance. At this point, the shape of this red blood cell remains unchanged. Okay, that rookie is good. So it will seep in. If we perform distillation again, and it's distilled water, the concentration of water inside is relatively low, while the concentration of water outside is higher. What happens afterward, once it has penetrated in? The red blood cell may burst—this bursting means. If you place this red blood cell in a concentrated saltwater solution, meaning there is less water outside and more water inside, water will move out through osmosis. This is the cell of the plant we just mentioned. This layer is the cell membrane, and the outer, very rigid layer is called the cell wall. Therefore, depending on the situation, its differences become like this. So when you put it in salt water, the amount of water moving in and out will be roughly equal, maintaining a balance. If it's distilled water, since there's less water inside, water from outside will渗透 in. If it's placed in concentrated salt water, the outside has less water, so water inside will seep out. Then this cell would be considered relatively larger. This is a diagram. This is the unicellular organism we were discussing, called Asterionella. And this is a Euglena. The euglena I mentioned last time was particularly special, I mean, regarding the euglena, Only plants have chloroplasts. Euglena has chlorophyll, which is an enzyme enabling euglena to perform photosynthesis. It has chlorophyll on it; it is chlorophyll, not a chloroplast. Therefore, Euglena can produce its own nutrients through sunlight, and also obtain nutrients by ingestion. It's a rather peculiar creature, either one works. Alright, this is an amoeba. Okay, this is bacteria. The green thing known as_less than a green thing, not because paramecium itself contains chlorophyll. As for bacteria, they also have a cell wall. This is a bacterium, and this is also a type of bacterium. Alright, next is animals. This is a tarsier, our animal. The teacher once said that the slow loris I photographed in the Philippines is a multicellular organism. So what we just saw was single-celled; now we move on to multicellular. This is also a bushbaby; in fact, it is a nocturnal animal. This is also the Chocolate Hills in the Philippines, extremely beautiful. When we go there, it will be daytime, since everyone is resting at the moment, so we need to keep our eyes wide open to take a look. He looked very sleepy, and his eyes soon closed. Actually, when it gets to autumn or winter, look—do you see it's brown? It turns the entire mountain range into a brown color. Alright, this is mold. It looks just like golden sand scattered on the ground, so it's called the Chocolate Hills. Mold should be noted; mold is a type of multicellular organism. It is not unicellular; the mold has hyphae underneath and secretes certain enzymes. This is a rather peculiar phenomenon on the Earth's surface. Break down the nutrients in this food, and then absorb them. This is mold. Just like our bread went moldy and grew this kind of black mold. That cell has many, many cells; tissues are like muscle tissue, skin tissue. As for organs, things like the stomach, liver, pancreas—are all organs. Right, the hierarchical levels of animal organization are: cells, tissues, organs, systems, individuals, and organisms. It's like our digestive system. Now, let's introduce this organism one by one. This is a cell; for example, skeletal muscle cells, smooth muscle cells, cardiac muscle cells, muscle cells, and nerve cells. These are all skin cells, all belonging to the cellular level. Blood is also a type of tissue, as it consists of three different types of blood cells and some plasma. As for the organization, such as muscle tissue, membrane tissue, or nervous tissue. Therefore, in our classification, blood is regarded as a level of tissue. It is the blood vessels that represent the level of organs. Another one is nerve cell; when many nerve cells join together, they form nerve tissue. This is muscle tissue, this is the tissue of our epidermis, this is nerve tissue. Blood is also a type of tissue. Alright, now let's talk about organs. Different tissues can join together to form specific structures that perform particular functions. Like eyes, like lungs, heart, pancreas, liver. The skin is the largest organ on the surface of the human body, while the liver is one of the larger organs inside the human body. Such as our gastrointestinal tract, our bladder, or blood vessels—they are all parts of an organ. This is our heart. The heart is a very powerful muscle that beats continuously throughout the day and cannot stop. And this is the lung, the organ in the human body with the largest surface area in contact with the external environment. The intestine is the human body's largest organ by surface area, as it is covered with villi that aid in nutrient absorption. Because the lungs contain numerous alveoli, and these alveoli increase the surface area available for contact with air. Therefore, it is the organ with the largest surface area of contact. So it is our largest organ. We will provide detailed explanations for these later. Next is the organ system. Such as the digestive system, circulatory system, respiratory system, and excretory system. In an animal's body, when organs with related functions work together through division of labor, providing services in a coordinated manner, this arrangement is called a system. This is our digestive system: after entering through the mouth, food passes through the esophagus, then the stomach, small intestine, large intestine, and finally exits through the anus. Therefore, the anus is also one of our digestive organs. including, for example, the liver. Just hear it for now, as it will all be explained again later. The human circulatory system refers to the system of blood circulation; red represents arteries, and blue represents veins. The liver secretes bile, which is stored in the gallbladder and released when fatty foods are consumed, emulsifying the fat. It also includes the lymphatic circulation system. This is the human circulatory system. As for the respiratory system, it includes the nose, which isn't drawn here and therefore can't be seen. That is our excretory system. Nose, pharynx, larynx—the larynx is here—nose, pharynx, larynx. The excretory system actually does not include the anus. The excretory system refers to our body's process of eliminating excess waste, known as the excretory system. Next is the trachea; below it branches into the bronchi. This is our respiratory system. For example, the lungs—when we breathe, they also expel some waste products. But we wouldn't deliberately refer to this respiratory system as the excretory system, because that would be rather strange. That excretory system, like this, is our kidneys. It filters out excess water and salt, then transports the remaining fluid through the ureter to the bladder for storage. However, the respiratory system includes the elimination of waste, carbon dioxide, which should not be. When the bladder fills up to capacity, it will expel the urine through the urethra. This is our excretory system. If it is an unfertilized egg, that is, a regular egg, then it is not considered a living organism. Alright, next comes living organisms. A developing egg like this one is a living organism. It is a unicellular organism, specifically an egg cell, which belongs to the cellular level. This bird is also a living organism. What if it's already undergoing cell division and generating new life here? Once it comes out, it becomes a living organism. Alright, the above are the levels of organization of this animal. It has only cells, tissues, organs, and individual organisms. What about the cells? They are specifically called epidermal cells. Alright, then the structural hierarchy of plants is relatively simple; it has no system. Epidermal cells remember, it's transparent. You say there's green here, but this green actually comes through from the mesophyll cells behind. The epidermal cells themselves are transparent, because transparency means there are no chloroplasts. Okay, it's a stratum corneum. As for the epidermal cells in plants, the stomata are mostly located on the lower epidermis. Epidermal cells, transparent, without chloroplasts. Its composition is the epidermis, with the lower epidermis being more abundant. Note this down briefly—it's likely to be tested. Alright, next, the structure responsible for protecting cells is the stomata. Didn't we just talk about stomata? There are more stomata on the lower epidermis. That's how the stomata work: they consist of two guard cells paired together, shaped like half-moons, forming a single pore. There are many small green dots on the stomata, which are chloroplasts, enabling them to perform photosynthesis. As for the stomata, they are essentially pores. In fact, water can exit through them, but it cannot enter. Therefore, during the process of transpiration, it expels some excess water through the stomata. So this is only for going out, not coming in. The plant's water must enter and be absorbed through its roots. As long as a living organism is alive, it will breathe. As for the stomata, they allow oxygen and carbon dioxide to enter and exit. This refers to cellular respiration, not respiratory movements; it is cellular respiration. Do you say oxygen should come in? Of course it should come in! In order for its cells to produce energy, it needs both oxygen and glucose. So when plants are at night, they are still alive and must carry out respiration, which requires oxygen. So where does the oxygen come from? It doesn't have lungs, does it? So why is it said not to go into that very dense, thick forest at night? It can carry out respiration only by drawing in oxygen through this pore. At this time, some plants in the forest area are also undergoing respiration. It's competing with you for oxygen. So some people say that overseas, its forests are vast stretches. So at this point, if the air at the bottom has very little oxygen, It is possible to lose consciousness due to lack of oxygen when entering that dense forest. When it's too dense, it tells you not to enter at night. Because when entering at night, if there's no wind at that moment and the air isn't circulating, And at this moment, the plant itself is also undergoing respiration. And in this valley area, there are many forests and many trees. It also competes with you for oxygen, and at this point, what might happen to you? You won't have enough oxygen. Well then, off the subject. So remember, stomata can only allow this gas to enter and exit. A person entering might experience hallucinations or even pass out due to insufficient oxygen. This gas refers to oxygen and carbon dioxide. As for oxygen, It is possible to enter and possible to exit. If it performs respiration at night, oxygen will enter through the stomata. When performing photosynthesis, it releases oxygen. This is the part of the stomata. These are chloroplast cells in plants; the numerous green dots are chloroplasts. As for carbon dioxide, it also has inflows and outflows. It is an enzyme, so it can assist this plant-like photosynthesis. As for the part about photosynthesis, a more detailed explanation will be provided later. This is the epidermal tissue. Alright, next is the hierarchical organization of our cells. As for the epidermal tissue, it includes the epidermal tissue layer shown here. Once again, there are cells, tissues, organs, and organisms. Thus, the epidermal cells and some of the tissues on top are all referred to as epidermal tissue. This is called a疏导 tissue. Just like our blood vessels, they transport nutrients. Nutrients and water, then called conducting tissues. Conducting tissues refer to those specialized in transporting water and nutrients. As for plants, some of them get thicker because they have this kind of branching tissue. We'll call it疏导. The plant's tendons can gradually thicken year by year. This is the hierarchical structure of plants. Okay, then the nutritional organs of plants are also divided into three types, called root, stem, and sap. It's called a nutritional organ because it is related to the production of nutrients. It is related to the production, transportation, and absorption of nutrients. That root absorbs water, while the stem enables the plant to stand upright. Thus they are called nutritional organs. Therefore, the nutritional organs of plants are roots, stems, and leaves. It can, as it contains conducting tissues that enable the plant to transport water and nutrients. That fluid is the site of the type of photosynthesis, where nutrients are produced. Alright, this is the root of our plant. As for plant roots, they are divided into taproots and fibrous roots. As for the detailed classifications, yes, for example, that sort of thing, This part will be explained in detail later; just glance through it here. As for the stem, it is divided into stems arranged in a ring pattern and those arranged in a fan pattern. Which types of plants have circular, radially arranged structures, and which have fan-shaped ones will be explained later. As for this leaf, it can be divided into reticulate venation, resembling a spiderweb—reticulate venation. This so-called parallel pattern is called a parallel vein. Next, the reproductive organs of plants are the flowers, fruits, and seeds. Flowers, fruits, and persimmon seeds are all related to a plant's reproduction and are collectively known as reproductive organs. Flowering and fruiting—fruits, persimmons, and seeds inside them—so these three are all reproductive organs of plants. Okay, this is a flower. As for flowers, they can be categorized in various ways—such as having three petals, or a number that's a multiple of four. I'll introduce that later; this is the section on fruits and persimmons. That is a seed; that seed is here; autumn fruit is a type of seed. This is a seed; the seeds of autumn fruit have wings and will fly away. Alright, this is an individual plant; the mung bean sprout is an individual plant. I'll explain that later; just a brief mention here. Alright, next, let's take a look at this: hair is a symptomatic tissue growing on the skin. Because some people think hair is a cell—no, our cells must certainly have what? It will have cells and cytoplasm, cell membranes—yes, its basic, common structures. Alright, this is rotifer; rotifers are one type of feed for ornamental fish. That hair is just tissue, it's tissue of a symptom. The three natural feeds for ornamental fish are worms and brine shrimp. Rotifers and fish worms; fish worms are actually algae. Rotifers feed on bacteria, yeast from bread, or certain types of microalgae feed. Oh, the microphone is moving. It's a storage root, not the part you eat. This is a radish, so the radish is eaten as its abnormal root. Alright, next, as for the radish, it always eats its transformed root. Didn't I say before? Yes-man, yes-man, potatoes are the pervert who eats them. That sweet potato is eaten as its modified root. This is also worth jotting down a bit, just in case it gets copied sometimes. Just as I was saying, for the first question, it matched some elements and symbols. Alright, next we'll do the practice exercise for the male lead's seat, part of Chapter Two. This problem is usually encountered in the second year of junior high school, according to the curriculum. So we don't understand why they teach this in the first year of junior high school at this time. Since it has been taught, let's take a look together. Which one is correct for pairing? Carbon, carbon should be C, isn't it? Not N. Oxygen should be O, hydrogen H, nitrogen N. So the correct one is hydrogen, hydrogen is H. So fix the mistake you made; this is the first question. Okay, the second one: the following molecules are composed of the same element. Actually, this topic is also part of the junior high school second-year curriculum. Because it was pulled over here too quickly, due to the abrupt transition. Let me briefly explain: a molecule refers to something composed of, not a single element. It's the same kind of element; this is really hard to explain. You don't even understand the current target molecules. It consists of two elements; oxygen is O2. Many molecules, such as water, whose chemical formula is H2O. But they stick together in pairs, so oxygen meets its condition. A molecule composed of the same element. That's ozone, which is O3. Can this be written as text? Water is H2O, let me write it down. H2O is the water molecule, and oxygen is called O2. What I just said, O3, is ozone. I haven't tried it before; let me write it down. Highlighter, brush, brush is ready. As for bubbles, it's C6H12O6. C6H12O6 Two oxygen atoms bonded together look something like this. Writing with a mouse is really hard. Let's change the color, I don't like this one. This "2" refers to CO2. It's somewhat like oxygen, with two atoms bonded together like this. So, look here, only this oxygen is O. It's that oxygen. You sometimes see this item in beverage products. I just realized my head bumped into that water molecule; I just wasted my time. I didn't advertise that Taishan pure water for them. Taishan pure water isn't pure either. When we talk about pure water, we mean distilled water. Taishan Pure Water is mineral water containing minerals. It's impure, you know. I'm writing from this side. That's beside the point; ignore it. That water's chemical formula is called H2O. As for water, its chemical formula is called H2O. Alright, let's move on to the next one. How about this one? Okay, question three. It states that A is carbon dioxide, B is a cell, C is protein, and D is hydrogen. Which of the following is correct when arranged from smallest to largest? Of course, the smallest one is hydrogen. Who's the smallest? Good, come here! Here is carbon dioxide, using small molecules. That one is the largest—the cell, since cells are relatively large. So it's arranged as one, two, three, in this order. When comparing these two, protein is obviously smaller, right? Ding, Jia, Bing, Yi. Ding, Jia, Bing, Yi. So the answer is pig. What properties does glucose solution possess? What properties can help restore stamina? This is the third question. What do our cells need? Alright, next question, let's look at the fourth one. Glucose, can be quickly absorbed, right? Alright, during hospital erotique, some patients need to be injected with glucose solution to regain their strength. So which one is it? This C option, you know. It can easily pass through cell membranes and be absorbed and utilized. Therefore, glucose is because it is easily absorbed and utilized, Therefore, for hospitalized patients, if their nutritional intake is insufficient, leading to malnutrition, This allows him to quickly absorb nutrients and become more energetic. Alright, why do they need to inject glucose solution? We'll just give him an injection of glucose solution. And what if we don't inject the starch solution? Which of the following is a reasonable inference regarding this phenomenon? He said that starch cannot be directly absorbed by cells. That answer is excellent; select answer A. The human body can break down starch. That's not right either, messing around with drug reactions like that. He said this is easier to obtain than starch, but that has nothing to do with him. We can do it through that oral cavity and intestinal fluid, Starch breakdown results in glucose. It can break down starch into glucose. So the pig's statement is also incorrect. Therefore, the answer is A. Alright, next question. Question 6: Irrigating plants with seawater In a situation with high salinity, when you irrigate plants, What phenomenon might its cells undergo? How is the seawater? The plant will become dehydrated. Oh, it's so salty, isn't it? It's not about drinking water; plants will dehydrate. What does "too salty" mean? Why? Because water will be渗透 out by seawater. The salt content is very high. Because seawater has less moisture. Plants contain a relatively high amount of water. has more water content than cells It will seep out. Alright, Question 7. Therefore, the amount of water entering the cell is less than the amount leaving the cell. A single barbecue restaurant fills countless homes with fragrance. I felt that deeply last time. In the end, it felt like we were grilling meat at home. I used the exhaust fan to vent all the smoke out. The cell membrane shrinks inward. So the answer is pig. The entire street was filled with the smell of grilled meat. How does the following principle of action work? What is this related to? It's basically diffusion. Which of the following statements is correct? Because gas molecules can diffuse outward. He said that paramecia have a specific shape. A specific shape, you mean? Alright, next question. This is unique to plants, really. Only plants have cell walls. It's a unicellular animal, not a multicellular one. The paramecium is a microorganism observed under a microscope. He said that the paramecium's cell has multiple functions. It belongs to multicellular organisms. He said that paramecia have complex organ systems. A system refers to many organs that come together to form a system. Paramecium is a unicellular organism. It is a single cell that carries out all life processes. Of course not. No, it's unicellular, not multicellular. He said that some life phenomena of paramecia can be observed under the microscope. Maybe, sure thing. Everything else is wrong, so the correct answer is indeed D. This is question eight. I wonder if that's the answer—just take a quick peek. He said, "One egg." We've mentioned that if an egg is not fertilized, Yes, good, next, question nine. It is an egg cell. Which of these foods is most likely to be at the organ level? So an egg is not an organ, you know. A slice of ham, kind of looks like the master. A tomato. A tomato is a fruit; it is what part of a plant? Genitalia Tofu is that soy-based product, you know. This has nothing at all to do with those organ cells. It's already a reprocessed food product, you know. So C is okay. Alright, so the answer is C. What about the tofu? Alright, Question 10. What is "eating tofu"? Hello, everyone. It's fine to come back to high school for review, too. If you think it won't be boring. Now regarding the hierarchical levels of composition in different organisms, Because bacteria are single-celled organisms, Therefore, its cell is an individual. That way of saying it isn't wrong. Which one is incorrect? Banyan tree, cellular tissue, organ, individual. There's nothing wrong with writing it in this hierarchical structure. He said that for cells and bacteria, their cell is the individual. Banyan, cellular tissue organ. That's right, that's OK. Go ahead, point out the mistakes. Both A and B are correct. That C said, the metamorphic species, the cell is the individual. That's true, that single-celled organism. How about that single cell? It's just an individual. So that's wrong, you know. Alright, Xinyue Zao said, "cells, tissues, organs, individuals." Therefore, the answer is C. Alright, let's move on to question eleven. No, Xin Yue Zao belongs to single-celled organisms. He said the deputy table is really so serious. Alright, let's take a look. Compare the functional characteristics of three types of organisms. Well, the function of a single cell. Functions of a single cell. There are many paramecia, right? Which of the following describes the characteristics of the three organisms? Yes, because a single cell needs to manage numerous life processes. So a single cell has many functions, right. All are correct. Are there many aquatic plants? Once a unicellular organism evolves to the point where a single cell performs all necessary functions. Its single cell will have more functions. It has an organ system. Algae are also considered single-celled microorganisms, and of course, there are many of them. Paramecium does not. Yes, none. Xinyue Zao is also much, not little. Algae are present. No, there are no water plants. So that's also incorrect. Xinyue Zao didn't. It can produce its own nutrients. Paramecium doesn't have it, but it can. So this part is wrong. Algae can. Algae won't work either. Xinyue Zao can do it. Ah, I spoke incorrectly again. The answer is B. Oh, awkward. So what? So, what is algae? So my understanding of algae was wrong. Take a look at the algae. Let me check if there's a pattern with algae. Algae, algae. Algae. Let me look for it. Wow, aren't they all wrong then? Algae. Why are you jumping around like that? Let me quickly search for information about algae on Google. Oh no. Abandon. Wait a minute. Otherwise, this question would be incorrect. Can I switch this screen? Let me check. If I perform a search from my end. Can you see that search content? Let me first search for what algae are. What does it look like? I'll clear it first. Algae.时段 It is a diatom. My pronunciation is really terrible, you know. Algae. Let me just paste the image here. Otherwise, you wouldn't be able to see it. Algae. Arthropods. Oh dear. That's multicellular. Algae. Come on, I'll just copy that picture over. Find one that's cuter. The key is wrong. Wait for me a moment. I'm sticking this algae here. Place it in this position. Wait for me a moment. Alright. Is the image displayed? I'm not very proficient with this either. So it's a black screen, right. Oh, yes. Please take a look, everyone. This is the pattern of that algae. The画面 has a delay. Look here. This algae. The algae we just mentioned, what about them? Let's take a look. Paramecium has many functions of a single cell. It belongs to the arthropods in classification. Oh, yes. Because it is a unicellular organism. So a single cell accomplishes many things. Because they are arthropods. Many, that's correct intellectually. It's wrong for there to be so many single-celled algae. Because it is a multicellular organism. So, regarding the arthropods then. That dinoflagellate is unicellular. So it's more rather than less. It has some cells or some tissues. Alright, now let's look at the one with organ systems. That aquatic plant has a system of organs. Algae have organ systems. I don't want to answer this question. This problem is so terrible. To perform a specific task. How can algae have organ systems? Oh, I feel a bit awkward about this question. Algae have organs. I'll skip this question for now; I won't answer it for the time being. Ask our senior teacher about it. How can such a small creature have organ systems? There are organ systems. Generally refers to multicellular organisms. Is it true that all multicellular organisms have organ systems? I'm not quite clear about this part either. So I won't give the answer for now. I'll check it out first before answering. Would multicellularity bring that about? Alright, let's move on to the next question. Alright, Question twelve. Teachers are not omnipotent and do not know everything. Levels composed of the same organism. What does this leaf refer to? Come on, Question twelve. It is an organ. Harvest organs. The eye is an organ. Yes. Blood is a tissue. This is the system. This is the cellular level. Red blood cells belong to the cellular level. So it is also an organ, just like it. In the necklace options, the leaves of the compatible and the number of容 (capacity) The answer is only eyes. Alright, let's pick A next. Alright, thirteen questions, he said. The table below shows the proposals made by four students respectively. Got it, this one is lighter. Statements regarding humans and protoplasm. As Kobayashi said, the human body is capable of undergoing metabolic reactions, Is it the same for the young? Is the aforementioned statement correct? No, as long as it's a living organism, He said, "Is this clear?" All living organisms can carry out metabolic reactions. Then Xiao'an said, humans are multicellular organisms. Protozoa are unicellular. No, it's still multicellular. That's not right. That Ah Long said, the fruit of young quality is rich in nutrients, Flowers and fruits are seeds, both belonging to reproductive organs. So Ah-Lung was not wrong. The answer is C. That Ah-chuan said, a human's small intestine can absorb nutrients, It belongs to the reproductive organs. What? You're saying the fruit turned into a reproductive organ? Belongs to the nutritional organs. No, humans do not have nutritive organs. Right? Of course it is. Nutritional organs are a term used to describe parts of a plant. So this is incorrect. Alright, next question. Seeing the year 2016 of the Republic of China, What is this? Taiwan has a ten hundred thousand, one hundred thousand, 210,000 newborns were born. How to express using scientific notation Interdisciplinary awareness and application. Number of newborns that year? Assuming you have already studied mathematics to a more advanced level, He said, A-jiao is on the Ministry of the Interior's website. You won't be unfamiliar with scientific notation once you've learned it. Here, I can only write the single digit. You should write it like this It cannot write ten digits. 2 1 Less than units digit, And then multiply by 10 to the power of something, right? 0 Alright, here's how you do it: 4 zeros We start counting from this side. 1 2 3 When writing scientific notation, 4 So you need to write 2 2 5 3 The length represented by the drinker is the smallest. Nanometers, of course. So the answer is selected Next question Yaya can find several types of electronic scales suitable for various applications on the market. Help her solve her life problems with the aid of this diagram. At that time, she said She received a medication prescription form. As shown in the right table Approximately four different dosage unit lengths Calcium hydroxide 10 grams 35 grams of hydrochloric acid Then clarify 230 grams of lime water Is this medicine? Which type of electronic scale can assist Yaya in accurately measuring the required amounts of all four medications? A says electronic fetal scale Its range is between 1 gram and 100 kilograms. Electronic kitchen scale It is between 100 milligrams and 10 kilograms. She needs 500 milligrams of copper sulfate. As for this question, then It's because of this This copper sulfate It is 500 milligrams. If you choose an electronic scale Its maximum capacity can only measure up to 100 grams. That's 500 grams, 500 milligrams. 500 milligrams Can't even detect 230 grams 500 mg measured Electronic desktop scale 500 milligrams is equivalent to 0.5 grams. It is between 1 milligram and 100 grams. Rewrite it again. This is equivalent to 0.5 grams. 0.5G So it's fine if the electronic scale reads 0.5 grams. But you can't weigh 230 grams. Over 100 grams So it's not that. The answer chosen is the electronic kitchen scale. The chosen option is B. Now let's move on to question 18. If it needs to prepare the required gold-precipitating lime water Is that right? The gold-embedded lime water weighs 230 grams. If you want to write 230 grams in scientific notation, 230 will be equal to The decimal point is here. A few to the left One two So it's 2.3 Expressed in scientific notation Go take the 10 quadratic That's how it's written. Therefore, the answer is C. How do I write it? Regarding question 19, here it is. I need to move my head away. It should have gotten stuck Question 19 The teacher moved his head away. The head has been moved. Beautiful 19 Where is Yaya? She wants to know her recent weight changes. Which type of electronic scale should be used? Her weight will definitely exceed 100 grams. It will also exceed 10 kilograms. So which option is the correct answer? Question 18 Less than 1000 yuan So then we chose Electronic platform scales are more suitable Therefore, the answer is A. Well then, regarding the above... That's what we were talking about Youth-level Nanyi's practice work Exercise Problems of Chapter Two Then, up to this point We'll just take that one Nan Yi's Practice Exercises All have been completed. Come to a temporary conclusion What about the next class? We must do Kangxuan's workbook. Finish that first chapter title Like Kangxuan's classification method It rarely exceeds 100 kilograms. It's the first two chapters of Nanyi and Hanlin. So in the end, Kangxuan said it was because After I finish teaching the first two chapters of Nanyi, Now let's talk about Kang Hsuan's curriculum. Because Kangxuan's first chapter already includes Hanlin and Nanyi's first two chapters It's okay if you don't understand, no problem. Alright, see you in our next class. Let me teach that one. Kang Hsuan's first chapter of the course Alright, we're currently on Nanyi's Then we'll have Kangxuan next time. Alright, then let's stop here for today. Kang Hsuan's Chapter One Bye-bye I'm not quite familiar with operating this yet. I'll turn off the microphone first. Wait for me a moment.