Question

Q. 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 1

Solution:
During night or dark: $\mathrm{CO}_{2}$ conc. incresses in sub-stomatal cevities $\rightarrow>\mathrm{ABA}$ participation $\rightarrow \mathrm{K}^{+}$ions exchange stopped $\rightarrow \mathrm{K}^{+}$ions transported back into subsidiary cells $\rightarrow$ Decreased $\mathrm{pH} \rightarrow>$ Starch synthesized in guard cells $\rightarrow$ Decreased O.P of guard cells $\rightarrow$ Exosmosis from guard cell $\rightarrow$ Stomata close

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