Repeated reproduction of Paramecia by binary fission leads to

Options

A. Senile decary
B. Fatigue
C. Sterillity
D. Mortality.

Answer

To answer the question regarding the repeated reproduction of Paramecia by binary fission, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Reproduction**:
- Reproduction is the biological process through which organisms produce new individuals similar to themselves. In Paramecia, this occurs through asexual reproduction.

**Hint**: Remember that reproduction can be either sexual or asexual, and Paramecia specifically reproduces asexually.

2. **Mode of Asexual Reproduction**:
- Paramecia reproduce asexually primarily through a process called binary fission. This involves the division of a single organism into two identical daughter cells.

**Hint**: Focus on the term "binary fission" as it is crucial for understanding how Paramecia reproduce.

3. **Nuclear Division**:
- During binary fission, Paramecia have two types of nuclei: the macronucleus and the micronucleus. The macronucleus undergoes a process called amytosis, while the micronucleus divides through mitosis.

**Hint**: Distinguish between the two types of nuclei and their respective processes of division.

4. **Formation of New Cells**:
- After the division of the nuclei, the cell divides, resulting in two new Paramecia, each containing a copy of both the macronucleus and micronucleus.

**Hint**: Each new cell must inherit genetic material from the parent cell.

5. **Repeated Reproduction Effects**:
- If binary fission occurs repeatedly, it can lead to an accumulation of organisms and eventually the decomposition of dead matter, which is a natural process in ecosystems.

**Hint**: Think about what happens in nature when organisms reproduce continuously.

6. **Identifying the Correct Option**:
- The repeated reproduction of Paramecia by binary fission leads to a process known as senile decay, which is the decomposition of dead matter.

**Hint**: Connect the concept of repeated reproduction to the ecological impact it has, leading to senile decay.

### Conclusion:
The correct answer to the question is **senile decay**, which corresponds to option number one.