Test: Nutrition In Plants

QUESTION: 1

The opening and closing of stomata is controlled by:

A.
Guard cells
B.
Xylem
C.
Chloroplast
D.
Phloem

Solution:

Stomata closed by guard cell and it regulate opening and closing of stomata. When stomata swell up when water is full and guard cell open that's why opening of stomata. When water release from stomata then guard cell shrink that's why closing of stomata.

QUESTION: 2

The stomatal pore opens when:

A.
Guard cells shrink
B.
Chloroplast of guard cells swell up
C.
Guard cells swell up
D.
Chloroplast of guard cells shrink

Solution:

The swelling of guard cells due to absorption of water causes opening of stomatal pores while shrinking of guard cells closes the pores. Opening and closing of stomata occurs due to turgor changes in guard cells. When guard cells are turgid, stomatal pore is open while in flaccid conditions, the stomatal aperture.

QUESTION: 3

During photosynthesis, light energy from the sun is absorbed by:

A.
Mitochondria
B.
Guard cell
C.
Chlorophyll
D.
Stomata

Solution:

Chlorophyll is a green coloured photosynthesis pigment occurs in chloroplast. It is site where photosynthesis take place. It traps solar energy and changes it into chemical energy.

QUESTION: 4

A minute pore which helps in exchange of gases is:

A.
Stomata
B.
Matrix
C.
Thylakoid
D.
Guard cell

Solution:

The exchange of oxygen and carbon dioxide in the leaf (as well as the loss of water vapor in transpiration) occurs through pores called stomata (singular = stoma).
The pores through which leaves exchange gases are STOMATA

QUESTION: 5

Chlorophyll is found in oval-shaped structures called as