In seeds, characterised by hypogeal germination, cotyledons generally do not becomes green because

Options

A. They lack mitochondria
B. They developed very early
C. They contain inhibitor
D. They remain below the soil

Answer

**Step-by-Step Solution:**

1. **Understanding Germination Types**:
- There are two main types of germination in plants: epigeal and hypogeal.
- In epigeal germination, the cotyledons (seed leaves) are pushed above the soil surface, where they can photosynthesize and turn green.

2. **Hypogeal Germination Explained**:
- In hypogeal germination, the seed remains below the soil surface during germination.
- The hypocotyl (the stem part below the cotyledons) is short and does not lift the cotyledons above the soil.

3. **Cotyledon Behavior in Hypogeal Germination**:
- Since the cotyledons remain buried in the soil, they do not receive sunlight.
- Without exposure to sunlight, the cotyledons cannot perform photosynthesis.

4. **Color of Cotyledons**:
- The lack of photosynthesis means that the cotyledons do not develop chlorophyll, which is necessary for the green color.
- As a result, the cotyledons in hypogeal germination typically remain brown or non-green.

5. **Conclusion**:
- Therefore, the primary reason that cotyledons do not become green in seeds characterized by hypogeal germination is that they remain below the soil and are not exposed to sunlight.