Read the following statements carefully :
(i) Urge for eating and drinking as well as body temperature is controlled by the hypothalamus.
(ii) The limbic system along with hypothalamus involved in the regulation of sexual behavior, expression of emotions , and excitement.
(iii) The presence of four round swellings called corpora quadrigemina on the ventral portion of the midbrain is the characteristics feature of the human brain.
(iv) Cerebellum has a very convoluted surface in order to provide additional space for many neurons.
How many statements from the above is/are correct ?

Options

A. Four
B. One
C. Two
D. Three

Answer

To determine how many statements are correct, let's analyze each statement step by step:

1. **Statement (i)**: "Urge for eating and drinking as well as body temperature is controlled by the hypothalamus."
- The hypothalamus is indeed responsible for regulating homeostasis, which includes the urge for eating and drinking, as well as the regulation of body temperature. Thus, this statement is **correct**.

2. **Statement (ii)**: "The limbic system along with hypothalamus involved in the regulation of sexual behavior, expression of emotions, and excitement."
- The limbic system, which includes the hypothalamus, plays a crucial role in regulating emotions, sexual behavior, and excitement. Therefore, this statement is also **correct**.

3. **Statement (iii)**: "The presence of four round swellings called corpora quadrigemina on the ventral portion of the midbrain is the characteristic feature of the human brain."
- The corpora quadrigemina are indeed present in the midbrain, but they are located on the **dorsal** portion, not the ventral portion. Thus, this statement is **incorrect**.

4. **Statement (iv)**: "Cerebellum has a very convoluted surface in order to provide additional space for many neurons."
- The cerebellum does have a convoluted surface, which increases its surface area and allows for a greater number of neurons. Therefore, this statement is **correct**.

Now, let's summarize the correctness of each statement:
- Statement (i): Correct
- Statement (ii): Correct
- Statement (iii): Incorrect
- Statement (iv): Correct

**Total Correct Statements**: 3

### Final Answer:
**Three statements are correct.**