What is the ratio of monoecious and dioecious plants in the following examples _____ Pinus, chara, papaya, castor, marchantia, maize, cycas

Options

A. `3 :4`
B. `2 :5`
C. `4:3`
D. `5:2`

Answer

To determine the ratio of monoecious and dioecious plants from the given examples, we will follow these steps:

### Step 1: Identify the definitions
- **Monoecious plants**: These are plants that have both male and female reproductive structures on the same individual.
- **Dioecious plants**: These are plants that have male and female reproductive structures on separate individuals.

### Step 2: List the plants and classify them
We will classify each of the given plants as either monoecious or dioecious:
1. **Pinus** - Monoecious
2. **Chara** - Monoecious
3. **Papaya** - Dioecious
4. **Castor** - Dioecious
5. **Marchantia** - Dioecious
6. **Maize** - Dioecious
7. **Cycas** - Dioecious

### Step 3: Count the number of each type
- **Monoecious plants**: Pinus, Chara (Total = 2)
- **Dioecious plants**: Papaya, Castor, Marchantia, Maize, Cycas (Total = 5)

### Step 4: Calculate the ratio
The ratio of monoecious to dioecious plants is calculated as follows:
- Monoecious : Dioecious = 2 : 5

### Step 5: Conclusion
The final answer is that the ratio of monoecious to dioecious plants in the given examples is **2:5**.

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