Question

Name the hormone which is responsible for apical dominance.
iA farmer wants to remove broad-leaved weeds from the jowar plantation in his field. Suggest any plant hormone to remove such weeds.
iiMention any two applications of cytokinin.

Hint:

Auxins control growth patterns; synthetic auxins like 2,4-D are selective herbicides; cytokinins promote growth and longevity.

Answer 1

i. Hormone: Auxin (e.g., IAA) is responsible for apical dominance, inhibiting lateral bud growth.
ii. Hormone for Weeds: 2,4-D (synthetic auxin) selectively kills broad-leaved weeds without harming monocots like jowar.
iii. Applications of Cytokinin:
1. Promotes cell division in tissue culture.
2. Delays senescence in leaves.
Answer: i. Auxin; ii. 2,4-D; iii. Cell division, delays senescence.