Which one of the following plants is dioecious?

Options

A. Cycas
B. Papaya
C. Marchantia
D. All of these

Answer

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

### Step-by-Step Solution:

1. **Understand Dioecious Plants**:
- Dioecious plants are those that have male and female reproductive organs on separate individual plants. This means that for reproduction to occur, both a male and a female plant are needed.

2. **Analyze the Options**:
- **Option 1: Saccharum (Sugarcane)**:
- Saccharum is typically not dioecious; it is usually considered a monoecious plant, where both male and female flowers can be found on the same plant.
- **Option 2: Papaya**:
- Papaya is a well-known dioecious plant. It has male and female flowers on separate plants, which is a characteristic of dioecious species.
- **Option 3: Marchantia**:
- Marchantia is also dioecious. In this plant, male and female reproductive structures are found on different gametophytes.

3. **Conclusion**:
- Since both Papaya and Marchantia are dioecious, and Saccharum is not, the correct answer to the question is that Papaya and Marchantia are dioecious plants. However, the question asks for which one of the following plants is dioecious, and since the options include "all of these," it is important to note that only Papaya and Marchantia are dioecious among the given options.

4. **Final Answer**:
- The correct answer is **Papaya** and **Marchantia** are dioecious, but if the option "all of these" is included, it is misleading since Saccharum is not dioecious.