This section contains Assertion (A) and Reason (R ) type questions. Each questions has (1), (2), (3), and (4) out of which only one is correct.
Assertion (A) Green algae are ancestore of land plants.
Reason (R ) This is because of similar chlorophyll – a and b, carotenoids, cellulose and pectin in cell wall, flagella in motile forms.

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 "Green algae are ancestors of land plants." This is based on evolutionary biology, where it is widely accepted that land plants evolved from green algae.

2. **Analyzing the Reason (R)**: The reason provided is that "This is because of similar chlorophyll – a and b, carotenoids, cellulose and pectin in cell wall, flagella in motile forms." This reason highlights the similarities in biochemical and structural characteristics between green algae and land plants.

3. **Evaluating the Similarities**:
- **Chlorophyll a and b**: Both green algae and land plants contain chlorophyll a and b, which are essential for photosynthesis.
- **Carotenoids**: These pigments are also present in both groups, contributing to their ability to capture light energy.
- **Cellulose and Pectin in Cell Walls**: The cell walls of both green algae and land plants are primarily composed of cellulose and pectin, indicating a close relationship.
- **Flagella in Motile Forms**: Many green algae have flagella in their motile forms, which is a characteristic not found in most land plants but indicates a shared ancestry.

4. **Conclusion**: Since both the assertion and the reason are correct, and the reason provides a valid explanation for the assertion, we conclude that the correct option is (1): "Both A and R are correct, and R is the correct explanation of A."