Physical basis of life is

Options

A. Nucleoplasm
B. Cytoplasm
C. Plasmalemma
D. Protoplasm

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the "physical basis of life." This refers to the fundamental components that constitute living organisms.

2. **Analyzing the Options**:
- **a. Nuclear plasma**: This is the substance found within the nucleus of a cell, but it does not represent the entire physical basis of life.
- **b. Cytoplasm**: This is the jelly-like substance outside the nucleus within a cell, containing organelles, but it is not the complete physical basis of life.
- **c. Plasma lemma**: This term refers to the plasma membrane, which surrounds the cell. While important, it does not encompass all aspects of life.
- **d. Protoplasm**: This includes both the cytoplasm and the nucleoplasm (the substance within the nucleus), along with all the organelles and substances necessary for life processes.

3. **Identifying the Correct Answer**: Protoplasm is considered the physical basis of life as it contains all the essential components required for the functioning of living cells. It accounts for a significant portion of the cell's weight and includes nucleic acids, proteins, lipids, and other nutrients.

4. **Conclusion**: Based on the analysis, the correct answer to the question "Physical basis of life is" is **option D: Protoplasm**.