Read the following statements (A - D) and answer the question that follows them -
A Infundibulum in the thyroid is a thin flap of connective tissue .
B - Rupturing of Graafian follicles to release ovum is mediated by LH.
C - Source of GH and Prolactin are different
D - Hormones are non - nutrient chemicals.
How many of the above statements are incorrect ?

Options

A. None
B. One
C. Two
D. Three

Answer

To solve the question, we will analyze each statement (A to D) to determine whether they are correct or incorrect.

### Step-by-Step Solution:

1. **Statement A**: "Infundibulum in the thyroid is a thin flap of connective tissue."
- **Analysis**: This statement is incorrect. The correct term for the thin flap of connective tissue connecting the two lobes of the thyroid gland is "isthmus." The term "infundibulum" refers to a funnel-shaped structure, such as the proximal part of the fallopian tube, not a part of the thyroid gland.

2. **Statement B**: "Rupturing of Graafian follicles to release ovum is mediated by LH."
- **Analysis**: This statement is correct. Luteinizing hormone (LH) is responsible for triggering ovulation, which involves the rupture of the Graafian follicle and the release of a mature ovum from the ovary.

3. **Statement C**: "Source of GH and Prolactin are different."
- **Analysis**: This statement is incorrect. Both growth hormone (GH) and prolactin are produced by the anterior pituitary gland, making their source the same.

4. **Statement D**: "Hormones are non-nutrient chemicals."
- **Analysis**: This statement is correct. Hormones are indeed non-nutrient chemicals that act as intercellular messengers and are produced in trace amounts.

### Summary of Findings:
- **Incorrect Statements**: A and C
- **Correct Statements**: B and D

### Conclusion:
Out of the four statements, two statements (A and C) are incorrect.

### Final Answer:
**The number of incorrect statements is 2.**

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