Pick out the correct statements.
I. Cytokinins especially help in delaying senescence.
II. Auxins are involved in regulating apical dominance.
III. Ethylene is especially useful in enhancing seed germination.
IV. Gibberellins are responsible for immature falling of leaves.
Pick out the correct statements.
I. Cytokinins especially help in delaying senescence.
II. Auxins are involved in regulating apical dominance.
III. Ethylene is especially useful in enhancing seed germination.
IV. Gibberellins are responsible for immature falling of leaves.
The correct option is C I and II
Statement III and IV are incorrect because ethylene is a gaseous hormone responsible for fruit ripening. Gibberellin is especially useful in enhancing seed germination. Germination of seed is triggered by soaking the seed in water. After imbibing water the embryo secretes gibberellin, which diffuses to the aleurone layer and stimulates the synthesis of several enzymes including α-amylase.
These enzymes catalyze the breakdown of food reserve in endosperm. Abscission (immature falling) of various parts is stimulated by ethylene.
I and II
Statement III and IV are incorrect because ethylene is a gaseous hormone responsible for fruit ripening. Gibberellin is especially useful in enhancing seed germination. Germination of seed is triggered by soaking the seed in water. After imbibing water the embryo secretes gibberellin, which diffuses to the aleurone layer and stimulates the synthesis of several enzymes including α-amylase.
These enzymes catalyze the breakdown of food reserve in endosperm. Abscission (immature falling) of various parts is stimulated by ethylene.
