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

Consider the following statements:
I. The process of cold treatment that hastens floweringis called vernalisaion. Thus,

   artificial cold treatmentof germinating winter wheat seeds could induce flowering if

    grown  in spring.

II. Vernalisation prepares a plant to flower. It makes the plant perceptive to a stimulus

     but does not function as a stimulus.

III. If vernalisation is followed by high temperature treatment at about 40o C for a

     minimum of 2 days, the vernalisation stimulus is lost. This is known as

     devernalisation.

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:

1. Both are correct and II explains I

2. Both are correct but II does not explain I

3. I is correct but II is incorrect

4. I is incorrect but II is correct

Consider the following statements regarding a certain plant growth regulator:

This plant hormone must be:

1. Auxin

2. Cytokinin

3. Giberrellin

4. Ethylene

Consider the following statements regarding the synthesis and distribution of auxins:

I. Auxins are made continuously in the shoot apex and young leaves

II. It moves away from the tip and its movement is described as basipetal and polar

III. It moves by active transport from cell to cell and is eventually inactivated and

     degraded by enzymes

IV. Long term transport can also occur via the vascular system (mainly phloem) from

    shoots to roots

V. No auxin is made by roots

The correct statements are:

(1) I, II, III1

(2) I, II, IV

(3) II, III, 2

(4) III, IV, 34

Consider the following statements:

I. In low concentrations, auxin can inhibit ethylene formation and transport of precursor

   in plants;
II. High concentrations of auxin can induce the synthesis of ethylene.

III. Therefore, the high concentration can induce maleness of flowers in some species.

The correct statements are:

(1) I, II, III

(2) I, II

(3) I, III

(4) II, III

Match the following concerning the activity/function and the phytohormone involved :-

(a) Fruit ripener         (i) Abscisic acid

(b) Herbicide             (ii) GA 3

(c) Bolting agent       (iii) 2, 4-D

(d) Stress hormone   (iv) Ethephon

Select the correct option from following :-

(1) (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)

(2) (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)

(3) (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)

(4) (a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)

Two leaves with respective growth are depicted below.

Consider A' and B' or final size after growth. Which of following statement explain the above situation appropriately :-

1. Relative growth rate of A is twice as that of B relative growth rate
2. Absolute growth rate is same in A and B
3. Absolute growth rate of B is 1/10 of A absoulate growth rate
4. Relative growth rate of B is same as A relative growt