This section contains Assertion (A) and Reason (R) type questions. Each question has choices (1), (2), (3) and (4), out of which only one is correct.
Assertion (A) Synergids of embryo sac help in fertilisation in angiosperms.
Reason (R) Filiform apparatus of synergids secrete certain chemotropically active substance due to which pollen tube grows towards the embryo sac.

Options

A. Both Assertion and reason are correct, and Reason is the correct explanation of Assertion.
B. Both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
C. Assertion is correct, but Reason is incorrect
D. Assertion is incorrect, but Reason is correct

Answer

**Step-by-Step Solution:**

1. **Understanding the Assertion (A):**
- The assertion states that "Synergids of the embryo sac help in fertilization in angiosperms."
- Synergids are specialized cells present in the embryo sac of flowering plants (angiosperms) that play a crucial role in the fertilization process.

2. **Understanding the Reason (R):**
- The reason states that "Filiform apparatus of synergids secrete certain chemotropically active substances due to which the pollen tube grows towards the embryo sac."
- The filiform apparatus is a structure found in the synergids that helps guide the pollen tube towards the egg cell for successful fertilization.

3. **Connecting Assertion and Reason:**
- The synergids indeed assist in fertilization by guiding the pollen tube towards the egg cell.
- The filiform apparatus, located at the end of the synergids, secretes substances that attract the pollen tube, facilitating its growth towards the embryo sac.

4. **Evaluating the Truth of A and R:**
- Both the assertion and the reason are true statements.
- The reason (R) correctly explains the assertion (A) because the secretion of chemotropic substances by the filiform apparatus is essential for the pollen tube's attraction and growth towards the synergids.

5. **Conclusion:**
- Since both the assertion and reason are true, and the reason correctly explains the assertion, the correct answer is option (1): "Both A and R are true and R is the correct explanation of A."