In how many of given plants, single leaf arises from each node? Alstonia, Brassica, Calotropis, Chilli, Chinarose, Guava, Datura, Sunflower

Options

A. Six
B. Seven
C. Four
D. Eight

Answer

To determine how many of the given plants have a single leaf arising from each node, we will analyze the phyllotaxy (leaf arrangement) of each plant mentioned in the question.

### Step-by-Step Solution:

1. **Understand Phyllotaxy**: Phyllotaxy refers to the arrangement of leaves on a stem. There are three main types: alternate, opposite, and whorled.

2. **Identify the Plants**:
- **Alstonia**: This plant exhibits whorled phyllotaxy, where more than two leaves arise from each node.
- **Brassica**: This plant also shows whorled phyllotaxy, with more than two leaves at each node.
- **Calotropis**: This plant has opposite phyllotaxy, where two leaves arise at each node.
- **Chilli**: This plant has alternate phyllotaxy, with a single leaf at each node.
- **Chinarose (China Rose)**: This plant exhibits alternate phyllotaxy, with a single leaf at each node.
- **Guava**: This plant has opposite phyllotaxy, with two leaves at each node.
- **Datura**: This plant has alternate phyllotaxy, with a single leaf at each node.
- **Sunflower**: This plant also has alternate phyllotaxy, with a single leaf at each node.

3. **Count the Plants with Single Leaf at Each Node**:
- From the analysis:
- Chilli: 1 leaf per node
- Chinarose: 1 leaf per node
- Datura: 1 leaf per node
- Sunflower: 1 leaf per node
- Total plants with a single leaf at each node = 4 (Chilli, Chinarose, Datura, Sunflower).

4. **Final Answer**: The number of plants from the given list that have a single leaf arising from each node is **4**.