Question

Read the given statements and identify the plant hormones X, Y and Z.
(i) Hormone Y suppresses flowering in mango and also promotes rapid internode/petiole elongation in deep water rice plants and hence helping leaves or upper part of shoot to remain above water.
(ii) Hormone X promotes root growth and root hair formation.
(ii) Hormone Z inhibits the seed germination, increases the tolerance of plant to various stresses, play important role in seed development maturation and dormancy.

• A. Y- Abscisic acid, X-Auxin, Z-Gibberellin
• B. Y-Ethylene, X-Auxin, Z-Gibberellin
• C. Y-Auxin, X-Ethylene, Z-Gibberellin
• D. Y-Gibberellin , X-auxin, Z-Abscisic acid

Answer 1

The correct option is D Y-Gibberellin , X-auxin, Z-Abscisic acid

• Gibberellic Acid (GA) suppresses flowering in fruit trees. GA plays a role in internode elongation in submerged parts of the rice plant.
• Auxin along with cytokinin promotes root growth and root hair formation.
• Abscisic acid (ABA) is a stress hormone, it protects the plant from unfavourable environmental conditions, by preventing seed germination (due to oxygen deficit, water stress etc).

So, the correct answer is option D.