The sexual reproduction whereby vegetative cells come in contact and sexual apparatus is alltogther absent is known as

Options

A. parthenogenesis
B. somatogamy
C. plasmogamy
D. hologamy

Answer

To solve the question, we need to identify the type of sexual reproduction in fungi where vegetative cells come into contact without the presence of sexual apparatus. Let's break down the solution step by step:

### Step-by-Step Solution:

1. **Understanding Sexual Reproduction in Fungi**:
- In fungi, sexual reproduction typically involves the fusion of gametes. However, in some cases, this can occur without distinct sexual structures.

2. **Identifying the Key Terms**:
- The question mentions "vegetative cells" and "sexual apparatus is altogether absent." This indicates that the process does not involve traditional male and female gametes.

3. **Analyzing the Options**:
- **Option A: Parthenogenesis** - This refers to a form of asexual reproduction where an egg develops into a new individual without fertilization. This does not fit our criteria.
- **Option B: Somatogamy** - This term refers to the fusion of vegetative cells (hyphae) to form a new individual, which aligns with the description in the question.
- **Option C: Plasmogamy** - This is the fusion of cytoplasm from two parent cells, but it does not specifically refer to vegetative cells.
- **Option D: Hologamy** - This involves the fusion of two complete organisms, which is not the same as the fusion of vegetative cells.

4. **Conclusion**:
- Based on the definitions and the analysis of the options, the correct answer is **Option B: Somatogamy**. This is the process where vegetative cells come in contact and fuse without the presence of sexual apparatus.

### Final Answer:
The sexual reproduction whereby vegetative cells come in contact and sexual apparatus is altogether absent is known as **Somatogamy** (Option B).

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