Diffusion may be enough in a unicellular organism but not in humans. What is the main reason?
Answer and explanation
Correct answer: In humans all cells are not directly in contact with outside environment
Diffusion is effective over short distances when a cell has a large surface area relative to its volume and is directly exposed to the surroundings. A unicellular organism can exchange gases, water, and dissolved substances across its cell membrane in this way. Humans are large, multicellular organisms; many internal cells lie far from the external environment, and diffusion alone would be too slow to meet their oxygen and nutrient demands. Therefore option A is correct, while the other statements are false.
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What is the correct answer to this question?
In humans all cells are not directly in contact with outside environment
Why is this the correct answer?
Diffusion is effective over short distances when a cell has a large surface area relative to its volume and is directly exposed to the surroundings. A unicellular organism can exchange gases, water, and dissolved substances across its cell membrane in this way. Humans are large, multicellular organisms; many internal cells lie far from the external environment, and diffusion alone would be too slow to meet their oxygen and nutrient demands. Therefore option A is correct, while the other statements are false.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Life Processes.
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