All the following statement is incorrect except:

Options

A. The longest phase of menstrual cycle is follicular phase while the shortest phases is ovulatory phase.
B. The ovary behaves as an endocrine gland during the luteal phase and is responsible for the thickening of the endometrium.
C. The formation of haploid second polar body occurs just before ovulation.
D. Permanent cessation of menses is an indication of pregnancy .

Answer

To solve the question, we need to evaluate the given statements about the menstrual cycle and identify which one is correct.

### Step-by-Step Solution:

1. **Evaluate the First Statement:**
- The statement claims that "The longest phase of the menstrual cycle is the follicular phase while the shortest phase is the ovulatory phase."
- This statement is incorrect. The longest phase of the menstrual cycle is actually the luteal phase, not the follicular phase. The ovulatory phase is indeed short, but it is not the shortest.

**Hint:** Remember the phases of the menstrual cycle: follicular, ovulatory, and luteal. Identify which is longest and shortest.

2. **Evaluate the Second Statement:**
- The statement claims that "The ovary behaves as an endocrine gland during the luteal phase and is responsible for thickening of the endometrium."
- This statement is correct. During the luteal phase, the corpus luteum forms and secretes progesterone, which is essential for thickening the endometrium in preparation for potential implantation.

**Hint:** Focus on the role of the corpus luteum and its hormonal secretions during the luteal phase.

3. **Evaluate the Third Statement:**
- The statement claims that "Formation of haploid 2nd polar body occurs just before ovulation."
- This statement is incorrect. The second polar body is formed after fertilization, not just before ovulation.

**Hint:** Recall the timing of polar body formation in relation to ovulation and fertilization.

4. **Evaluate the Fourth Statement:**
- The statement claims that "Pregnant cessation of menses is an indication of pregnancy."
- This statement is misleading. While the cessation of menses can indicate pregnancy, it is not definitive proof of pregnancy since other factors can also cause missed periods.

**Hint:** Consider other reasons for missed periods besides pregnancy.

### Conclusion:
After evaluating all the statements, we find that the only correct statement is the second one: "The ovary behaves as an endocrine gland during the luteal phase and is responsible for thickening of the endometrium."

### Final Answer:
The correct statement is: **"The ovary behaves as an endocrine gland during the luteal phase and is responsible for thickening of the endometrium."**