Which one of the following plants is monoecious

Options

A. Cycas
B. Papaya
C. Marchantia
D. Pinus

Answer

To determine which of the given plants is monoecious, we need to understand the definition of monoecious plants and analyze the options provided.

### Step-by-Step Solution:

1. **Understand the Term Monoecious**:
- Monoecious plants are those that have both male and female reproductive organs on the same individual. This means they produce both staminate (male) and pistillate (female) flowers.

2. **Analyze the Given Options**:
- The options provided are:
- Cyclus
- Papaya
- Pansyntia
- Pinus

3. **Identify Characteristics of Each Plant**:
- **Cyclus**: This plant is dioecious, meaning it has separate male and female plants.
- **Papaya**: Papaya can be monoecious, as some varieties have both male and female flowers on the same plant.
- **Pansyntia**: This is not a commonly recognized plant, and its classification is unclear.
- **Pinus**: Pine trees are also monoecious, as they produce both male and female cones on the same tree.

4. **Determine the Correct Answer**:
- Based on the definitions and characteristics, both Papaya and Pinus can be considered monoecious. However, since the question asks for one option, and Pinus is a well-known example of a monoecious plant, it is the most appropriate answer.

5. **Final Answer**:
- The correct answer is **Pinus** (option 4).