angiosperm flowering control

Question 1

PHOTOPERIODISM

Answer 1

a plant’s response to light

Question 2

Phytochromes

Answer 2

(pigment containing proteins) play an important role in plant regulation, as they change back and forth between two isomeric forms.

Question 3

Pr:

Answer 3

absorbs red light and converts it to infrared (DAYTIME)

Question 4

Pfr:

Answer 4

Pfr: absorbs infrared (far red) light and converts it to red (NIGHTTIME)
E.g. seed inhibited by infrared and promoted by red light