Why are guard cells important in opening and closing stomata?
Answer and explanation
Correct answer: They control stomatal size by changing water content
Guard cells surround each stomatal pore and regulate its opening. When they take up water, they become more turgid and their shape pulls the pore open; when they lose water, turgor falls and the pore tends to close. This regulation balances carbon-dioxide entry with water loss through transpiration. Thus A is correct. The other options describe invented or animal-specific functions and have no role in stomatal movement.
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What is the correct answer to this question?
They control stomatal size by changing water content
Why is this the correct answer?
Guard cells surround each stomatal pore and regulate its opening. When they take up water, they become more turgid and their shape pulls the pore open; when they lose water, turgor falls and the pore tends to close. This regulation balances carbon-dioxide entry with water loss through transpiration. Thus A is correct. The other options describe invented or animal-specific functions and have no role in stomatal movement.
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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