Which of the following statements are correct ?
1. The hormone responsible fore maintaining the diurnal rhythm of the body is secreted by a gland situated on the dorsal side of thee forebrain .
2. Exophthalmic goitre is characterized by protrusion of eyeballs , weight loss , enlargement of the thyroid gland and decreases basal metabolic rate .
3. Addison's disease occurs due ti decreased production of hormones from the outer part of the adrenal gland.
4. Hyper secretion of parathormone cause an increase in the deposition of calcium in bones .

Options

A. 1, 2 and 3
B. 2, 3 and 4
C. 1 and 3
D. 2 and 4

Answer

To determine which statements are correct, let's analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement 1**: "The hormone responsible for maintaining the diurnal rhythm of the body is secreted by a gland situated on the dorsal side of the forebrain."
- **Analysis**: This statement is correct. The hormone responsible for maintaining the diurnal rhythm is melatonin, which is secreted by the pineal gland. The pineal gland is indeed located on the dorsal side of the forebrain.

2. **Statement 2**: "Exophthalmic goitre is characterized by protrusion of eyeballs, weight loss, enlargement of the thyroid gland and decreased basal metabolic rate."
- **Analysis**: This statement is incorrect. Exophthalmic goitre, also known as Graves' disease, is a form of hyperthyroidism, which is characterized by an increased basal metabolic rate, not a decreased one. Therefore, this statement is false.

3. **Statement 3**: "Addison's disease occurs due to decreased production of hormones from the outer part of the adrenal gland."
- **Analysis**: This statement is correct. Addison's disease is caused by insufficient production of hormones from the adrenal cortex, which is the outer part of the adrenal gland. This includes hormones such as cortisol and aldosterone.

4. **Statement 4**: "Hypersecretion of parathormone causes an increase in the deposition of calcium in bones."
- **Analysis**: This statement is incorrect. Parathormone (or parathyroid hormone) actually increases the level of calcium in the blood by promoting the release of calcium from bones, not its deposition. Therefore, this statement is false.

### Conclusion:
The correct statements are:
- Statement 1: Correct
- Statement 2: Incorrect
- Statement 3: Correct
- Statement 4: Incorrect

Thus, the correct answers are **1 and 3**.