In bacteria, alternation of generations is absent because of the absence of

Options

A. nucleus and chromosomes
B. DNA and histone
C. syngamy and meiosis
D. equational division

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks why alternation of generations is absent in bacteria. This implies we need to identify a key reproductive process that is missing in bacteria.

2. **Modes of Reproduction**: Bacteria can reproduce through two primary modes: asexual reproduction and sexual reproduction. Asexual reproduction is common in bacteria, while sexual reproduction is more complex.

3. **Definition of Alternation of Generations**: Alternation of generations refers to a life cycle that alternates between asexual and sexual reproduction. In many organisms, this cycle includes the formation of gametes and the fusion of these gametes.

4. **Role of Syngamy**: Syngamy is the process where gametes fuse during sexual reproduction. In organisms that exhibit alternation of generations, syngamy is crucial for the transition between haploid and diploid stages.

5. **Absence of Gametes in Bacteria**: In bacteria, there is no formation of gametes. This is a critical point because without gametes, syngamy cannot occur.

6. **Consequences of Absence of Syngamy**: Since there is no syngamy, there is no meiosis (the process that reduces the chromosome number and leads to the formation of gametes). Without meiosis, the alternation between haploid and diploid stages cannot happen.

7. **Conclusion**: Therefore, the absence of syngamy and meiosis in bacteria is the reason why alternation of generations is absent.

### Final Answer:
In bacteria, alternation of generations is absent because of the absence of syngamy and meiosis.

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