Question

Which of the following DO NOT promote stomatal opening in plants that do not use CAM metabolism (choose all that are correct) CHOOSE MORE THAN ONE!!

A	Increased levels of the plant hormone ABA (abscisic acid)

B	Blue light

C

Red light

D	Low levels of CO2

E

Darkness

F

Drought

Leaves exposed to full sunlight absorb a lot of energy and need to dissipate heat effectively to prevent damage. Which of the following are used by leaves to dissipate excess heat energy?

A	Radiative heat loss

B	Sensible heat loss

C	Latent heat loss

D	All of the above

E	A and C only.

Answer 1

1. Options AEF are correct.
ABA promotes stomatal closure in all plants.
Both red and blue light promotes stomatal opening in C3 and C4 plants.
Low levels of CO2 promotes stomatal opening.
Darkness promotes stomatal closure.
Drought promotes stomatal closure.

2. Option D is correct.
The heat energy transfer in plants includes radiative transfer, sensible heat transfer, and latent heat transfer.