A) ethylene
B) cytokinin
C) IAA
D) gibberellins
Correct Answer: D
Solution :
Germination of barley seed is triggered by soaking the seed in water. After imbibing water the embyro secretes gibberellin, which diffuses to the aleurone layer, gibberellins, stimulates the synthesis of several enzymes including a-amylase. These enzymes catalyze the breakdown of food reserve in the endosperm and the products of digestion diffuse to the embryo, where they are used in growth.
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