In monoecious plant like castor and maize

Options

A. autogamy and allogmy are not prevented
B. geitonogamy is prevented
C. autogamy is not prevented
D. geitonogamy is not prevented

Answer

**Step-by-Step Solution:**

1. **Understanding Monoecious Plants**:
- Monoecious plants, such as castor and maize, have both male and female flowers on the same plant. This means that a single plant can produce both types of gametes.

2. **Defining Autogamy and Allogamy**:
- Autogamy refers to self-fertilization, where pollen from a male flower fertilizes the ovule of the same flower.
- Allogamy refers to cross-fertilization, where pollen from one flower fertilizes the ovule of another flower.

3. **Analyzing Autogamy in Monoecious Plants**:
- In monoecious plants, autogamy is generally prevented because the male and female flowers are separate. Therefore, pollen cannot transfer from the male to the female flower of the same flower.

4. **Analyzing Allogamy in Monoecious Plants**:
- Allogamy is possible in monoecious plants because pollen can transfer from the male flower of one plant to the female flower of another plant, or from one male flower to a female flower on the same plant.

5. **Understanding Genetogamy**:
- Genetogamy refers to the transfer of pollen from one flower to another flower of the same plant. In monoecious plants, this is not prevented since the plant has both male and female flowers.

6. **Conclusion**:
- In monoecious plants like castor and maize, autogamy is prevented, allogamy is not prevented, and genetogamy is not prevented. The correct statement is that "genetogamy is not prevented."

**Final Answer**: Genetogamy is not prevented in monoecious plants like castor and maize.

---