Physiological Responses

Question 0

Hormone that induces cell division and is an auxin antagonist in mediating apical dominance

Answer 0

Cytokinins

Question 1

Hormone that induces apical dominance, growth and fruit development, and it’s means of transports involves the parenchyma of vascular bundle

Answer 1

Auxin

Question 2

Hormone that induces fruit ripening and senescence

Answer 2

Ethylene

Question 3

Hormone that induces stomates closure

Answer 3

Abscisic acid

Question 4

Hormone that induces elongated growth, seed germination and flowering

Answer 4

Gibberellins

Question 5

Hormone that induces cell growth (expansion and division) in shoots, and promote/inhibit root growth.

Answer 5

Brassinosteroids

Question 6

Hormone responsible for induction of flowering

Answer 6

Florigen

Question 7

What happens when Pr is flashed with red light?

Answer 7

It converts to Pfr

Question 8

What happens when Pfr is flashed with far red light?

Answer 8

It converts to Pr

Question 9

Effect of Pfr in long day plants

Answer 9

Stimulates flowering

Question 10

Effect of Pfr in short day plants

Answer 10

Inhibits flowering

Question 11

How does auxin trigger cell growth?

Answer 11

1. Proton pumps are activated in response to auxin
2. Protons are pumped from the cytoplasm to cellwall, pH of the cell wall changes from 7 to ~4.5
3. Expansins are activated by decreased pH. Expansins disrupt hydrogen bonding between components of the cell wall.
4. Cell wall loosens

Question 12

Short day plants

Answer 12

Requires the light period to be shorter than critical length

Question 13

Long day plants

Answer 13

Requires the light period to be longer than critical length