Acacia (Australian Acacia), Euphorbia, and Taeniophyllum possess modified parts for the purpose of photosynthesis. These modified parts respectively are

Options

A. Root, Stem and Petiole
B. Stem, Petiole and Root
C. Petiole, Root and Stem
D. Petiole, Stem and Root

Answer

To answer the question about the modified parts of Acacia, Euphorbia, and Taeniophyllum that are adapted for photosynthesis, we can break down the information as follows:

### Step-by-Step Solution:

1. **Understand Photosynthesis**:
- Photosynthesis is the process by which green plants use sunlight to synthesize foods from carbon dioxide and water. This process primarily occurs in green parts of the plants where chlorophyll is present.

2. **Identify the Modified Part in Acacia**:
- In Acacia, the petioles (the stalks that attach leaves to the stem) are modified for photosynthesis. These petioles contain chlorophyll, allowing them to perform photosynthesis instead of the leaves.

3. **Identify the Modified Part in Euphorbia**:
- In Euphorbia, the stems are modified for photosynthesis. The leaves are either very small or absent, and the green stems take over the role of photosynthesis due to the presence of chlorophyll.

4. **Identify the Modified Part in Taeniophyllum**:
- In Taeniophyllum, the modified parts are the roots. These roots are thin and ribbon-like, growing above the soil surface. They are green and contain chlorophyll, enabling them to carry out photosynthesis.

5. **Summarize the Findings**:
- Acacia has modified petioles for photosynthesis.
- Euphorbia has modified stems for photosynthesis.
- Taeniophyllum has modified roots for photosynthesis.

### Final Answer:
- The modified parts for photosynthesis in these plants are:
- **Acacia**: Petiole
- **Euphorbia**: Stem
- **Taeniophyllum**: Root