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 "All the following statements are incorrect except:", we will analyze each of the provided statements regarding the menstrual cycle and identify which one is correct.

### Step-by-Step Solution:

1. **Analyze the First Statement:**
- **Statement:** "The longest phase of the menstrual cycle is the follicular phase while the shortest phase is the ovulatory phase."
- **Evaluation:** This statement is correct. The follicular phase is indeed the longest phase of the menstrual cycle, lasting from the first day of menstruation until ovulation. The ovulatory phase is the shortest, lasting approximately 24 hours.

2. **Analyze the Second Statement:**
- **Statement:** "The ovary behaves as an endocrine gland during the luteal phase and is responsible for the thickening of the endometrium."
- **Evaluation:** This statement is incorrect. While the ovary does function as an endocrine gland during the luteal phase, it is the corpus luteum (which develops from the ruptured follicle) that secretes hormones like progesterone to maintain the endometrium. The statement is misleading because it implies the ovary as a whole is responsible rather than specifying the corpus luteum.

3. **Analyze the Third Statement:**
- **Statement:** "The formation of haploid second polar body occurs just before ovulation."
- **Evaluation:** This statement is also incorrect. The second polar body is formed after fertilization, not before ovulation. It occurs when the secondary oocyte completes meiosis II upon the entry of sperm.

4. **Analyze the Fourth Statement:**
- **Statement:** "Permanent cessation of menses is an indication of pregnancy."
- **Evaluation:** This statement is incorrect. Permanent cessation of menses is known as menopause, which is a natural biological process and not an indication of pregnancy.

### Conclusion:
After evaluating all the statements, the only correct statement is the first one: "The longest phase of the menstrual cycle is the follicular phase while the shortest phase is the ovulatory phase."

### Final Answer:
The correct option is: **The longest phase of the menstrual cycle is the follicular phase while the shortest phase is the ovulatory phase.**

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