Assertion: Plant growth as a whole is indefinite.
Reason : Plants retain the capacity of continuous growth throughout their life.

Options

A. Point out if both are true with reason being correct explanation
B. both are true but reason is not correct explanation
C. assertion is true but reason is wrong
D. and both are wrong

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion**: The assertion states that "Plant growth as a whole is indefinite." This means that plants do not have a fixed size or growth limit; they can grow continuously throughout their lives.

2. **Understanding the Reason**: The reason provided is that "Plants retain the capacity of continuous growth throughout their life." This implies that plants have the ability to keep growing without stopping, which supports the idea of indefinite growth.

3. **Analyzing the Connection**: To determine if the reason correctly explains the assertion, we need to see if the capacity for continuous growth is what allows plants to have indefinite growth. The presence of meristematic tissues in plants (apical, intercalary, and lateral meristems) enables them to grow continuously.

4. **Conclusion**: Both the assertion and the reason are true. The reason does correctly explain the assertion because the continuous growth capacity of plants is what leads to their indefinite growth.

5. **Final Answer**: Therefore, the correct answer is that both the assertion and the reason are true, and the reason is the correct explanation of the assertion.