- 1(current)
Q. No.
Consider the following statements regarding phytochrome:
I. Pr is metabolically inactive and absorbs red light(660nm). On absorption of light it gets
converted into a metabolically active Pfr.
II. Pfr converts back to Pr after absorbing far red light(730nm).
III. Treatment with red light (R) stimulates seed germination,whereas far red light (FR)
inhibits seed germination.
The correct statements are:
(1) I and II
(2) I and III
(3) I, II, III
(4) None
Consider the following statements:
I. They flower when the day length is less than a certain critical length. If these plants are
exposed to day lengths in excess of this critical point, they continue growing vegetatively.
II. Long day plants flower when the day length is greater than a certain critical length
III. short day plants are actually long night plants and long day plants are actually short
night plants. The correct statements are:
(1) I and II
(2) II and III
(3) I and III
(4) I, II and III
Consider the following statements:
I. The phytochrome-mediated response to photoperiod occurs in the leaves
II. Flowering occurs in the apical meristems.
III. A signal, called florigen, connects the two
The correct statements are:
(1) I, II, III
(2) I, II
(3) I, III
(4) II, III
Reason(R): Flowering in LDP needs only the duration of light period.
Choices for Assertions and reasons:
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
- 1(current)
Q. No.
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