60. Given below are names of phytohormones in column I and their associated features/effects/function in column II.

                   I                                                        II
A.Auxin                                      i. Delayed leaf senescence
               B. Gibberellins                         ii. Epinastic bending of leaves
C.Cytokinin                              iii. Polar transport
D. Ethylene                                iv. Removal of seed dormancy.

Select the correct set ofcombinbinations from the option given below;

(1) A-iii, B-ii, C-iv, D-i              (2) A-iv, B-iii, C-i, D-ii

(3) A-iii, B-iv, C-i, D-ii              (4) A-i, B-iv, C-iii, D-ii

Correct answer: (3) A-iii, B-iv, C-i, D-ii

Explanation:

• (A) Auxin is known for polar transport in plants, crucial for directional growth responses like phototropism and gravitropism.

• (B) Gibberellins are involved in removal of seed dormancy and promotion of germination by breaking dormancy.

• (C) Cytokinins delay leaf senescence and promote cell division and growth in plants.

• (D) Ethylene causes epinastic bending of leaves, a characteristic symptom of ethylene action, and also promotes senescence.

Option-wise:

• (1) A-iii, B-ii, C-iv, D-i — Incorrect (B and C mismatched).

• (2) A-iv, B-iii, C-i, D-ii — Incorrect (A and B mismatched).

• (3) A-iii, B-iv, C-i, D-ii — Correct set.

• (4) A-i, B-iv, C-iii, D-ii — Incorrect (A and C mismatched).

  Auxin directs plant growth through polar transport, gibberellins promote seed germination, cytokinins delay aging of leaves, and ethylene induces characteristic leaf bending, highlighting distinct but essential hormone functions in plant development.