Coleoptile and coleorhize in monocot embryo :

Options

A. are extensions of scutellum
B. are foliar structures
C. are extensions of plumule and radicle
D. secrete hydrolytic enzmes

Answer

### Step-by-Step Solution:

1. **Understanding the Terms**:
- **Coleoptile**: This is a protective sheath that covers the emerging shoot (plumule) in monocot seeds.
- **Coleorhiza**: This is a protective sheath that covers the radicle (embryonic root) in monocot seeds.

2. **Identifying Their Functions**:
- The coleoptile serves to protect the plumule as it grows upwards towards the light.
- The coleorhiza protects the radicle as it grows downwards into the soil.

3. **Relation to Scutellum**:
- The scutellum is the single cotyledon found in monocots, such as grasses.
- Both coleoptile and coleorhiza are extensions of the scutellum, which means they develop from it.

4. **Analyzing the Options**:
- The options provided include:
- Extensions of scutellum
- Foliar structures
- Extensions of plumule and radical
- Secrete hydrolytic enzymes
- The correct option is "are extensions of scutellum" since both coleoptile and coleorhiza derive from the scutellum.

5. **Conclusion**:
- Therefore, the correct answer to the question regarding coleoptile and coleorhiza in monocot embryos is that they are extensions of the scutellum.