Assertion: Ovule is ategmic in Santalum.
Reason: Ovule without integument is called ategmic.

Options

A. If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
B. If both Assertion and Reason are true and the Reason is not

the correct explanation of the Assertion.
C. If Assertion is true but the Reason is false.
D. If both Assertion and Reason are false.

Answer

**Step-by-Step Solution:**

1. **Understanding the Terms:**
- The assertion states that "Ovule is ategmic in Santalum." To understand this, we need to know what an ategmic ovule is.
- The reason states that "Ovule without integument is called ategmic." This definition is crucial for understanding the assertion.

2. **Definition of Integument:**
- Integument refers to the outer protective layer surrounding the ovule. It plays a significant role in the protection and development of the ovule.

3. **Types of Ovules Based on Integument:**
- There are three types of ovules based on the number of integuments:
- **Unitegmic:** Ovule with one integument.
- **Bitegmic:** Ovule with two integuments (most common in angiosperms).
- **Ategmic:** Ovule with no integuments present.

4. **Identifying the Type of Ovule in Santalum:**
- The assertion claims that the ovule in Santalum is ategmic, meaning it has no integuments. This aligns with the definition provided in the reason.

5. **Evaluating the Assertion and Reason:**
- Since the assertion is true (Santalum has ategmic ovules) and the reason is also true (an ovule without integuments is indeed called ategmic), we can conclude that both statements are correct.

6. **Conclusion:**
- The correct answer to the question is that both the assertion and reason are true, and the reason correctly explains the assertion.

**Final Answer:**
Both the assertion and reason are true, and the reason is the correct explanation of the assertion.

---