What controls the opening and closing of stomata?
Answer and explanation
Correct answer: Guard cells
Each stoma is surrounded by a pair of specialized guard cells. Changes in their water content alter turgor pressure: when they become turgid, the pore generally opens, and when they lose water, it closes. This regulates carbon dioxide entry and reduces excessive water loss. Root, blood and nerve cells do not directly control stomatal movement. Hence option A is correct.
Frequently asked questions
What is the correct answer to this question?
Guard cells
Why is this the correct answer?
Each stoma is surrounded by a pair of specialized guard cells. Changes in their water content alter turgor pressure: when they become turgid, the pore generally opens, and when they lose water, it closes. This regulates carbon dioxide entry and reduces excessive water loss. Root, blood and nerve cells do not directly control stomatal movement. Hence option A is correct.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Life Processes.
Student feedback
Was this question useful?
👍 0 Helpful 👎 0 Not helpful
Yes 0% No 0%
0 responsesStudent Reviews
No published reviews yet.
