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 the 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 to 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 solve the question regarding which statements are correct, we will 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."
- 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.
- **Conclusion**: This statement is **correct**.

2. **Statement 2**: "Exophthalmic goitre is characterized by protrusion of eyeballs, weight loss, enlargement of the thyroid gland and decreases basal metabolic rate."
- Exophthalmic goitre, also known as Graves' disease, is characterized by the **protrusion of eyeballs** (exophthalmos), **weight loss**, and **enlargement of the thyroid gland**. However, it is associated with an **increased** basal metabolic rate due to hyperthyroidism, not a decrease.
- **Conclusion**: This statement is **incorrect**.

3. **Statement 3**: "Addison's disease occurs due to decreased production of hormones from the outer part of the adrenal gland."
- Addison's disease is indeed caused by a deficiency in the production of hormones from the **adrenal cortex**, which is the outer part of the adrenal gland. The primary hormone affected is **cortisol**.
- **Conclusion**: This statement is **correct**.

4. **Statement 4**: "Hyper secretion of parathormone causes an increase in the deposition of calcium in bones."
- Parathormone (or parathyroid hormone) is responsible for increasing blood calcium levels by promoting the release of calcium from bones, not its deposition. Therefore, hypersecretion of parathormone leads to **increased blood calcium levels** and **decreased deposition of calcium in bones**.
- **Conclusion**: This statement is **incorrect**.

### Final Evaluation:
- **Correct Statements**: 1 and 3.
- **Incorrect Statements**: 2 and 4.

Thus, the correct answer is that statements 1 and 3 are correct.