Neet Solved Paper 2015 Question 23
Question: Which one gives the most valid and recent explanation for stomatal movements?
Options:
A) Transpiration
B) Potassium influx and efflux
C) Starch hydrolysis
D) Guard cell photosynthesis
Show Answer
Answer:
Correct Answer: B
Solution:
- This explanation is based on the understanding that the movement of potassium ions (K+) into and out of the guard cells plays a crucial role in the opening and closing of stomata. When potassium ions enter the guard cells, water follows by osmosis, causing the guard cells to swell and the stomata to open. Conversely, when potassium ions exit the guard cells, water also leaves, causing the guard cells to shrink and the stomata to close. This mechanism is widely accepted in modern plant physiology.
BETA
