A. The term 'limited life span' cannot be associated with many unicellular organism.
R. The unicellular organims divide as soon as they get mature and continue to live as two or more daughter organisms .

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion
B. It both Assertion & Reason are true but the reason is not the correct explanation of the assertion
C. If Assertion is true statement but Reason is false
D. If both Assertion and Reason are false statements

Answer

To solve the assertion and reason question, we will analyze both statements step by step.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states: "The term 'limited life span' cannot be associated with many unicellular organisms."
- We need to clarify what is meant by "limited life span." In biological terms, lifespan refers to the duration of life from birth to natural death.

2. **Analyzing Unicellular Organisms**:
- Unicellular organisms, such as bacteria and amoeba, reproduce by a process called binary fission, where one organism divides into two or more daughter cells.
- This means that as soon as they reach maturity, they can divide and continue their lineage without experiencing a natural death.

3. **Understanding the Reason**:
- The reason states: "The unicellular organisms divide as soon as they get mature and continue to live as two or more daughter organisms."
- This statement explains the assertion by indicating that the process of division allows unicellular organisms to perpetuate their existence without a defined end or natural death.

4. **Conclusion**:
- Since unicellular organisms do not experience natural death and can continuously divide, the assertion that they do not have a limited lifespan is true.
- The reason provided accurately explains why the assertion is correct. Thus, both the assertion and the reason are true, and the reason is the correct explanation for the assertion.

### Final Answer:
Both the assertion and the reason are true, and the reason is the correct explanation of the assertion.

---