In several fungi and plants the bisexual condition is denoted by

Options

A. Homothallic and monoecious
B. Heterothallic and monoecious
C. Homothallic and dioecious
D. Heterothallic and dioecious

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the terms used to denote the bisexual condition in several fungi and plants.

2. **Identifying the Term for Fungi**: In fungi, the bisexual condition is referred to as **homothallic**. This term indicates that both male and female sex organs are present on the same thallus (the vegetative body of the fungus).

3. **Defining Homothallic**: The term "homothallic" can be broken down into two parts: "homo" meaning same, and "thallic" referring to the thallus. Thus, homothallic fungi have both reproductive structures in the same organism.

4. **Identifying the Term for Plants**: In plants, the bisexual condition is referred to as **monoecious**. This means that both male and female reproductive organs are found on the same plant.

5. **Defining Monoecious**: The term "monoecious" comes from Greek roots where "mono" means one and "oikos" means house, indicating that both types of reproductive organs are housed within a single plant.

6. **Evaluating the Options**:
- The first option combines **homothallic** for fungi and **monoecious** for plants, which is correct.
- The second option suggests **heterothallic** for fungi, which is incorrect as it refers to organisms with separate male and female structures.
- The third option pairs **homothallic** with **dioecious** for plants, which is also incorrect since dioecious plants have separate male and female individuals.
- The fourth option suggests **heterothallic** for fungi and **dioecious** for plants, which is incorrect.

7. **Conclusion**: The correct answer is the first option: **homothallic** for fungi and **monoecious** for plants.