Gibberellic acid is a/an:-
1. lndole compound
2. Terpene
3. Adenine derivative
4. Carotenoid

Which of the following statements about plant hormones is false?

1. The growth of plants in nature is probably regulated by a combination of growth-stimulating and growth-inhibiting hormones.

2. Abscisic acid generally promotes growth.

3. Gibberellins stimulate cell enlargement.

4. Cytokinins promote cell division.

During seed germination its stored food is mobilised by.

1. ethylene
2. cytokinin
3. ABA
4. gibberellin

“Foolish seedling" disease of rice led to the discovery of:-

1. GA

2. ABA

3. 2,4-D

4. IAA

Which one of the following pairs, is not correctly matched?

1. Abscisic acid - Stomatal closure

2. Gibberellic acid - Leaf fall

3. Cytokinin - Cell division 

4. IAA - Cell wall elongation

Gibberellins can promote seed germination because of their influence on

(1) rate of cell division

(2) production of hydrolyzing enzymes

(3) synthesis of abscisic acid

(4) absorption of water through hard seed coat

One hormone hastens maturity period in juvenile conifers, a second hormone controls xylem differentiation, while the third hormone increases the tolerance of plants to various stresses.They are respectively:-

(1) Gibberellin, Auxin, Ethylene

(2) Auxin, Gibberellin, Cytokinin

(3) Gibberellin, Auxin, ABA

(4) Auxin, Gibberellin, ABA

Which of the following plant growth hormone increase the yield of sugar by increasing the length of stem in sugarcane?
(1) Cytokinin

(2) Ethylene

(3) Gibberellic acid

(4) Auxin

Match each item in Column I with one item in Column II and chose your answer from the codes given below:
Column I                                                        Column II
I. Malting in brewing                                       1. Cytokinins

II. Parthenocarpy in tomatoes                          2. Gibberellins

III. Overcoming apical dominance                    3. Ethylene

IV. Female flowers in Cucumbers                      4. Auxins

Codes:
I II III IV
A. 4 2 3 41
B. 2 1 4 3
C. 2 4 1 3
D. 4 2 1 3

The PGRs of the other group which play an important role in plant growth inhibiting activities is not

1.Ethylene

2.ABA

3.GA

4.All of these