Question

During seed germination is stored food is mobilized by

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

Answer 1

The correct option is C Gibberellin

Gibberellin is a plant hormone that is involved in various physiological processes of plant. It causes stem elongation, flowering, germination. During seed germination, it promotes aleurone cells to secrete enzyme which breakdowns and mobilizes food stored in seed.

In seed the stored food is starch Gibberellins stimulate the synthesis of two enzymes i.e protease and α-amylase which are involved in the formation of sugar from starch. The proteases convert an inactive β-amylase to the active form. The active β-amylase and α-amylase together convert starch to glucose which is mobilized to meet the metabolic demands of the embryo during the germination of seed.

Cytokinines promote nutrient mobilisation, which helps in the delay of leaf senescence. ABA plays an important role in seed development, maturation and dormancy. Ethylene induces fruit ripening, breaks seed dormancy.

So, the correct answer is 'Gibberellin'