GK QUESTION#3608
Consider the following statements about guard cells:
1. When water flows into guard cells, they become turgid, causing the stomatal pore to close.
2. Loss of water from guard cells leads to the opening of stomatal pores and allowing gas exchange.
3. The opening and closing of stomata help regulate transpiration and control the exchange of gases in plants.
Which of the above statements is/are correct?
Show Answer
Answer
B. 3 only
Show Explanation
Explanation
Only statement 3 is correct. Water uptake normally makes guard cells turgid and opens the stomatal pore; water loss makes them flaccid and closes it. Stomata regulate gas exchange and transpiration. Guard-cell shape varies among plant groups.