Why is diffusion alone not enough in multicellular organisms?
Answer and explanation
Correct answer: Because all cells are not in direct contact with the outside environment
Diffusion is effective only over short distances and depends on a concentration gradient. A multicellular organism has many layers of cells, so inner cells are far from the external environment and may have high oxygen and nutrient demands. Diffusion alone would be too slow to supply them and remove wastes efficiently. Hence option A is correct; the other choices are false generalisations about multicellular organisms.
Frequently asked questions
What is the correct answer to this question?
Because all cells are not in direct contact with the outside environment
Why is this the correct answer?
Diffusion is effective only over short distances and depends on a concentration gradient. A multicellular organism has many layers of cells, so inner cells are far from the external environment and may have high oxygen and nutrient demands. Diffusion alone would be too slow to supply them and remove wastes efficiently. Hence option A is correct; the other choices are false generalisations about multicellular organisms.
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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