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 need to analyze the phyllotaxy (the arrangement of leaves on the stem) of each plant mentioned.

### Step-by-Step Solution:

1. **Understand Phyllotaxy**:
- Phyllotaxy refers to the arrangement of leaves on a stem or branch. It can be classified into three main types:
- **Alternate**: A single leaf arises from each node, alternating sides.
- **Opposite**: Two leaves arise from each node, positioned directly across from each other.
- **Whorled**: More than two leaves arise from a single node.

2. **Analyze Each Plant**:
- **Alstonia**: Exhibits whorled phyllotaxy (more than two leaves from each node).
- **Brassica**: Typically has an alternate arrangement (single leaf from each node).
- **Calotropis**: Displays opposite phyllotaxy (two leaves from each node).
- **Chilli**: Has alternate phyllotaxy (single leaf from each node).
- **Chinarose**: Also has alternate phyllotaxy (single leaf from each node).
- **Guava**: Exhibits opposite phyllotaxy (two leaves from each node).
- **Datura**: Shows alternate phyllotaxy (single leaf from each node).
- **Sunflower**: Displays alternate phyllotaxy (single leaf from each node).

3. **Count the Plants with Alternate Phyllotaxy**:
- From the analysis, the plants with alternate phyllotaxy (where a single leaf arises from each node) are:
- Brassica
- Chilli
- Chinarose
- Datura
- Sunflower
- Total: 5 plants (Brassica, Chilli, Chinarose, Datura, Sunflower).

4. **Conclusion**:
- The total number of plants from the given list that have a single leaf arising from each node is **5**.

### Final Answer:
**5 plants** (Brassica, Chilli, Chinarose, Datura, Sunflower) have a single leaf arising from each node.