Read the following statements :-
(i) Ernst Mayr, has been called "The Mendel of the `20^(th)` century.
(ii) All living organisms grow
(iii) Unicellular organisms multiply by cell division
(iv) Non-living object also exhibits metabolism
How many statement is/are correct ?

Options

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

Answer

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

1. **Statement (i)**: "Ernst Mayr has been called 'The Mendel of the 20th century.'"
- This statement is **false**. Ernst Mayr is known as "the Darwin of the 20th century" for his contributions to evolutionary biology, not as "the Mendel."

2. **Statement (ii)**: "All living organisms grow."
- This statement is **true**. All living organisms, whether unicellular or multicellular, exhibit growth as a fundamental characteristic of life.

3. **Statement (iii)**: "Unicellular organisms multiply by cell division."
- This statement is **true**. Unicellular organisms reproduce and multiply through processes such as binary fission, which is a form of cell division.

4. **Statement (iv)**: "Non-living objects also exhibit metabolism."
- This statement is **false**. Metabolism is a characteristic of living organisms, involving chemical processes that occur within them. Non-living objects do not exhibit metabolic processes.

Now, let's summarize the findings:
- Statement (i): False
- Statement (ii): True
- Statement (iii): True
- Statement (iv): False

Thus, the number of correct statements is **2** (statements ii and iii).

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