Gibberellin facilitates seed germination by triggering the synthesis of

Options

A. `alpha`-amylase
B. `beta`-amylase
C. Both A and B
D. `alpha`-amylase and protease.

Answer

**Step-by-Step Solution:**

1. **Understanding Gibberellin**: Gibberellin, specifically gibberellic acid, is a plant hormone that plays a crucial role in breaking seed dormancy and facilitating germination.

2. **Role of Starch in Seeds**: Before germination, seeds rely on stored starch as a source of energy. This starch needs to be converted into a usable form (glucose) for the developing seedling.

3. **Synthesis of Amylase**: Gibberellin stimulates the synthesis of the enzyme amylase in the aleurone layer of certain cereal seeds. This enzyme is critical for the breakdown of starch.

4. **Function of Alpha Amylase**: Among the types of amylases, alpha amylase is particularly important as it hydrolyzes (breaks down) starch into glucose. This glucose is then utilized by the seed embryo for nourishment during the early stages of germination.

5. **Conclusion**: Therefore, gibberellin facilitates seed germination by triggering the synthesis of alpha amylase, which is essential for converting starch into glucose for the seedling's nourishment.

**Final Answer**: Gibberellin facilitates seed germination by triggering the synthesis of alpha amylase.

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