How many plants contain alternate phyllotaxy from given examples - Alstonia, China rose, Guava , Mustard, Calotropis and sunflower

Options

A. Four
B. Three
C. Two
D. Five

Answer

To determine how many plants from the given examples exhibit alternate phyllotaxy, we will analyze each plant one by one.

### Step-by-Step Solution:

1. **Understanding Phyllotaxy**:
- Phyllotaxy refers to the arrangement of leaves on a plant stem. The main types include:
- **Alternate**: Leaves are arranged at different heights on the stem, with one leaf per node.
- **Opposite**: Two leaves arise from the same node, positioned directly across from each other.
- **Whorled**: More than two leaves arise from a single node.

2. **Analyzing Each Plant**:
- **Alstonia**: This plant exhibits whorled phyllotaxy, where multiple leaves arise from a single node.
- **China Rose**: This plant has alternate phyllotaxy, with leaves arranged at different heights on the stem.
- **Guava**: Guava shows opposite phyllotaxy, with two leaves per node.
- **Mustard**: Mustard also exhibits alternate phyllotaxy, with leaves arranged alternately on the stem.
- **Calotropis**: This plant has opposite phyllotaxy, with leaves arranged in pairs at each node.
- **Sunflower**: Sunflower exhibits alternate phyllotaxy, with leaves arranged alternately on the stem.

3. **Counting the Plants with Alternate Phyllotaxy**:
- From the analysis:
- **China Rose**: Alternate
- **Mustard**: Alternate
- **Sunflower**: Alternate
- Therefore, the total number of plants with alternate phyllotaxy is **3**.

### Final Answer:
The number of plants that contain alternate phyllotaxy from the given examples is **3** (China Rose, Mustard, and Sunflower).