Read the assertion and reason carefully to mark the correct option in question.
1. Assertion: Cell is the fundamental structural and functional unit of all living organisms.
Reason: Anything less than a complete structure of a cell does not ensure independent living.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.

Explanation

To solve the assertion and reason question, we will analyze both statements and determine their validity and relationship.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "Cell is the fundamental structural and functional unit of all living organisms."
- This means that cells are the basic building blocks of life. Every living organism, whether unicellular or multicellular, is made up of cells. Cells perform essential functions necessary for life.

2. **Understanding the Reason**:
- The reason states that "Anything less than a complete structure of a cell does not ensure independent living."
- This implies that for an organism to live independently, it must have a complete cell structure. If a structure is incomplete (like just a part of a cell or organelles), it cannot function independently or sustain life.

3. **Evaluating the Truth of Both Statements**:
- Both the assertion and the reason are true. Cells are indeed the fundamental units of life, and a complete cell structure is necessary for independent living.

4. **Determining the Relationship**:
- The reason explains why the assertion is true. The assertion highlights the importance of cells, while the reason clarifies that without a complete cell, independent life cannot be sustained.

5. **Choosing the Correct Option**:
- Since both the assertion and reason are true, and the reason correctly explains the assertion, the correct option is:
- **Option 1**: Both assertion and reason are true, and the reason is the correct explanation of the assertion.