Question

Dormancy of seed is broken by

• A. Auxin
• B. Gibberellin
• C. Abscisic acid
• D. Cytokinin

Answer 1

The correct option is B Gibberellin

Gibberellin are involved in seed germination in certain plants. They break seed dormancy by promoting mobilisation of reserve food material. In a classic experiment involving barley seed germination, researchers showed that the release of gibberellin from the embryo triggers the synthesis of $\alpha$-amylase, an enzyme that digests starch in the endosperm. As a result, glucose becomes available for absorption by the embryo. Although enzymes mobilize starch reserves in many types of seeds, gibberellin control of seed enzymes appears restricted to cereals and other grasses.

Thus, the correct answer is option B.