Question

The activity of $\alpha$-amylase in the endosperm of a germinating seed of barley is induced by

• A. Ethylene
• B. Cytokinin
• C. IAA
• D. Gibberellin

Answer 1

The correct option is D Gibberellin

Gibberellic acid induces de novo(a new) synthesis of various hydrolytic enzymes, such as $\alpha$-amylase, ribonuclease, $\alpha$-1, 3-glucanase and protease in aleurone cells of barley grains. This has been experimentally shown by isolating the aleurone layer and treating it with gibberellin solution. These enzymes are mobilized to endosperm during germination and hydrolyze the storage reserve.

So the correct answer is 'gibberellin'.