Seeds placed deep in the soil do not germinate because they are

Options

A. Unable to get sufficient oxygen
B. Without sufficient food to bring the seeding to the surface
C. Under pressure of overlying soil layers
D. Unable to get light

Answer

**Step-by-Step Solution:**

1. **Understanding Seed Germination**: Seed germination is the process by which a seed develops into a new plant. This process involves rapid cell division and growth.

2. **Energy Requirement**: During germination, seeds require energy to fuel the rapid cell division. This energy is primarily obtained through the oxidation of stored food within the seed.

3. **Role of Oxygen**: The oxidation process requires oxygen. Therefore, for seeds to germinate, they must have access to atmospheric oxygen.

4. **Conditions in Deep Soil**: When seeds are placed deep in the soil, they often encounter a lack of sufficient oxygen. The deeper the seed is buried, the less oxygen is available due to the overlying soil layers.

5. **Evaluating the Options**:
- **Option A**: "Unable to get sufficient oxygen" - This is correct because seeds need oxygen for the oxidation of food to generate energy for germination.
- **Option B**: "Without sufficient food to bring seedlings to the surface" - This is incorrect. Seeds have enough stored food; the issue is the lack of oxygen.
- **Option C**: "Under pressure of overlying soil layers" - This is also incorrect. While pressure may be a factor, it is not the primary reason for the lack of germination.
- **Option D**: "Unable to get light" - This is incorrect as well. Light is not necessary for the initial stages of germination.

6. **Conclusion**: The correct answer is Option A: Seeds placed deep in the soil do not germinate because they are unable to get sufficient oxygen.

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