Question

Match List-I with List-II.

List-I (Plant hormones)	List-II (Major function)
(A) Auxins	(I) Induces leaf and fruit abscission
(B) Cytokinin	(II) Elongation of cells
(C) Abscisic acid	(III) Stimulates the swelling of stems and roots
(D) Ethylene	(IV) Stimulate cell division

Choose the correct answer from the options given below:

• (A) - (II), (B) - (IV), (C) - (I), (D) - (III).
• (A) - (I), (B) - (II), (C) - (III), (D) - (IV).
• (A) - (III), (B) - (I), (C) - (IV), (D) - (II).
• (A) - (III), (B) - (IV), (C) - (I), (D) - (II).

Hint:

Match each hormone to the one growth process it is most famous for.

Answer 1

The Correct Option is A

This question asks us to link four plant hormones to the one function each is most associated with in plant physiology.

1. Auxins: Known chiefly for making cells stretch and elongate, especially in the shoot tip and coleoptile, so this pairs with "Elongation of cells" (II).
2. Cytokinin: Works with auxin to push cells through division and multiplication, particularly in roots and shoots, so it pairs with "Stimulate cell division" (IV).
3. Abscisic acid: Builds up when the plant is under water or salt stress and it promotes the dropping of leaves and fruit along with seed dormancy, so it pairs with "Induces leaf and fruit abscission" (I).
4. Ethylene: A gaseous hormone that, besides ripening fruit, is responsible for thickening and swelling of stems and roots as part of its growth response, so it pairs with "Stimulates the swelling of stems and roots" (III).

Putting these together gives (A)-(II), (B)-(IV), (C)-(I), (D)-(III).

Let's summarize:

• Auxin: elongation. Cytokinin: division. Abscisic acid: abscission and stress. Ethylene: swelling and ripening.

So the correct option is option 1.