The integument of Cycas ovule is hard on the account of

Options

A. Testa
B. Tegmen
C. Sclerotesta
D. Sarcotesta

Answer

To answer the question regarding why the integument of the Cycas ovule is hard, we can break down the solution into the following steps:

### Step-by-Step Solution:

1. **Understanding the Structure of Cycas Ovule**:
- The Cycas ovule has three distinct layers of integument: the outer layer, the middle layer, and the innermost layer.

2. **Identifying the Layers**:
- The **outermost layer** is called the **sarco testa**, which is fleshy and not hard.
- The **middle layer** is known as the **sclerotesta**, which is characterized as a hard or stony layer.
- The **innermost layer** is referred to as the **endotesta**, which is also fleshy and not hard.

3. **Determining the Hardness**:
- Since the question specifically asks about the hardness of the integument, we focus on the middle layer, the **sclerotesta**. This layer is known for its hardness and is responsible for the tough nature of the integument.

4. **Conclusion**:
- Therefore, the integument of the Cycas ovule is hard primarily due to the presence of the **sclerotesta**.

### Final Answer:
The integument of Cycas ovule is hard on account of **sclerotesta**.

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