A: chalazal vacuole is present in the help cell of embryo sac
R: Polarity of synergid cytoplasm is opposite to egg cell

Options

A. if both assetion A reason are ture and the reason is the correct explanation of the assertion then mark 1
B. if both assertion & reason are ture and the reason is not the correct explanation of the assertion then mark 2
C. if assertion is true statement but reason is false then mark 3
D. if both assertion and reason are false statements then mark 4

Answer

To solve the assertion and reason question, let's break it down step by step.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "chalazal vacuole is present in the help cell of embryo sac."
- In the context of flowering plants, the embryo sac is the female gametophyte and contains various cells, including synergids, egg cells, and polar nuclei.

2. **Identifying the Role of Chalazal Vacuole**:
- The chalazal vacuole is indeed found in the synergid cells of the embryo sac.
- Synergids are located at the micropylar end of the embryo sac and play a crucial role in guiding the pollen tube for fertilization.

3. **Understanding the Reason**:
- The reason states that "polarity of synergid cytoplasm is opposite to egg cell."
- In the embryo sac, the egg cell is positioned at the micropylar end, while the synergids are also at this end but have a different orientation in terms of their cytoplasmic polarity.

4. **Evaluating the Truth of the Statements**:
- Both the assertion and reason are true statements.
- However, while the reason is true, it does not directly explain the assertion. The presence of the chalazal vacuole in the synergid does not depend on the polarity of the synergid's cytoplasm being opposite to that of the egg cell.

5. **Conclusion**:
- Therefore, the correct answer is that both statements are true, but the reason is not the correct explanation for the assertion.

### Final Answer:
- **Assertion (A)**: True
- **Reason (R)**: True
- **Conclusion**: R is not the correct explanation of A.