DNA is absent in

Options

A. Mature spermatozoan
B. Mature RBC
C. Hair root
D. Enucleated ovum.

Answer

**Step-by-Step Solution:**

1. **Understanding DNA**: DNA (deoxyribonucleic acid) is the genetic material found in the nucleus of cells. It carries the genetic information necessary for the growth, development, and reproduction of organisms.

2. **Identifying the Options**: The question asks where DNA is absent among the following options:
- Mature spermatozoon
- Mature red blood cell (RBC)
- Hair root
- Enucleated ovum

3. **Analyzing Each Option**:
- **Mature Spermatozoon**: Sperm cells do contain DNA, as they have a nucleus that carries genetic information.
- **Mature Red Blood Cell (RBC)**: Mature RBCs are unique because they lack a nucleus and organelles. This absence means they do not contain DNA.
- **Hair Root**: Hair roots are part of living cells that contain DNA within their nuclei.
- **Enucleated Ovum**: An enucleated ovum (egg cell) is a cell that has had its nucleus removed, and therefore, it does not contain DNA.

4. **Conclusion**: Among the options, the mature red blood cell is the only one that is known to lack DNA, as it does not have a nucleus.

5. **Final Answer**: The correct answer is **Mature Red Blood Cell (RBC)**.

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