During seed germination which of the following part of embryonal axis grows first in hypogeal germination?

Options

A. Epicotyl
B. Hypocotyl
C. Cotyledons
D. Both (1) & (2)

Answer

To solve the question regarding which part of the embryonal axis grows first during hypogeal germination, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Hypogeal Germination**:
- Hypogeal germination is a type of seed germination where the cotyledons remain below the soil surface. This is in contrast to epigeal germination, where the cotyledons emerge above the ground.

2. **Identify the Parts of the Embryonal Axis**:
- The embryonal axis consists of the radicle (which develops into the root), hypocotyl (the part of the stem below the cotyledons), and the epicotyl (the part of the stem above the cotyledons).

3. **Sequence of Growth**:
- In hypogeal germination, the first part to emerge is the radicle, which grows downwards to anchor the plant and absorb water.
- Following the radicle, the hypocotyl elongates and pushes upwards, while the cotyledons remain below the soil.

4. **Conclusion**:
- In hypogeal germination, the hypocotyl grows first after the radicle has established itself. Therefore, the part of the embryonal axis that grows first is the **hypocotyl**.

### Final Answer:
The part of the embryonal axis that grows first in hypogeal germination is the **hypocotyl**.

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