Question
Biology Question on Transport in Plants
Opening and closing of stomata is due to the :-
A
Hormonal change in guard cells
B
Change in turgor pressure of guard cells
C
Gaseous exchange
D
Respiration.
Answer
Change in turgor pressure of guard cells
Explanation
Solution
During night or dark : CO conc. increases in sub-stomatal cavities ---> ABA participation --> K ions exchange stopped --> K ions transported back into subsidiary cells --> Decreased pH -->Starch synthesized in guard cells --> Decreased O.P of guard cells -->Exosmosis from guard cell --> Stomata close