Why is diffusion alone not sufficient in multicellular organisms?
Answer and explanation
Correct answer: Because all cells are not very close to the external environment
Diffusion is effective only across short distances and depends on a concentration gradient. In a multicellular organism, many cells lie deep inside the body and are far from the external environment or the surface where gases and nutrients enter. Diffusion alone would be too slow to meet their continuous demands or remove wastes efficiently, so specialized transport systems are needed. Therefore option A is correct; the other statements contradict basic biology.
Frequently asked questions
What is the correct answer to this question?
Because all cells are not very close to the external environment
Why is this the correct answer?
Diffusion is effective only across short distances and depends on a concentration gradient. In a multicellular organism, many cells lie deep inside the body and are far from the external environment or the surface where gases and nutrients enter. Diffusion alone would be too slow to meet their continuous demands or remove wastes efficiently, so specialized transport systems are needed. Therefore option A is correct; the other statements contradict basic biology.
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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