What do guard cells control by changing their water content in leaves?
Answer and explanation
Correct answer: Opening and closing of stomata
The governing concept is stomatal regulation. Guard cells surround each stoma and change their turgidity when water enters or leaves them. When they become turgid, the pore generally opens; when they lose water and become flaccid, it closes. This regulates carbon dioxide entry and limits water loss through transpiration. Therefore option A is correct, while root length, flower colour and seed size are not directly controlled by guard-cell movement.
Frequently asked questions
What is the correct answer to this question?
Opening and closing of stomata
Why is this the correct answer?
The governing concept is stomatal regulation. Guard cells surround each stoma and change their turgidity when water enters or leaves them. When they become turgid, the pore generally opens; when they lose water and become flaccid, it closes. This regulates carbon dioxide entry and limits water loss through transpiration. Therefore option A is correct, while root length, flower colour and seed size are not directly controlled by guard-cell 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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