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 Coleoptile and Coleorhiza**:
- Coleoptile is a protective sheath that covers the young shoot (plumule) of a monocot embryo. Its primary function is to protect the delicate shoot tip as it emerges from the soil.
- Coleorhiza, on the other hand, is a protective covering that surrounds the radicle (embryonic root) of the monocot embryo. It serves to protect the radicle as it grows downward into the soil.

2. **Identifying the Structures**:
- In a monocot seed, the scutellum is a significant structure that serves as a nutrient-absorbing tissue.
- Coleoptile and coleorhiza are extensions of the scutellum. The coleoptile is located above the scutellum, while the coleorhiza is found below the radicle.

3. **Analyzing the Options**:
- The question provides four options regarding the nature of coleoptile and coleorhiza:
- Option 1: Extensions of scutellum.
- Option 2: Foliar structures.
- Option 3: Extensions of plumule and radical.
- Option 4: Secrete hydrolytic enzymes.

4. **Evaluating Each Option**:
- **Option 1**: Correct. Coleoptile and coleorhiza are indeed extensions of the scutellum.
- **Option 2**: Incorrect. They are not foliar structures; they are protective structures.
- **Option 3**: Incorrect. They do not extend from the plumule and radical; they are protective coverings.
- **Option 4**: Incorrect. They do not secrete hydrolytic enzymes.

5. **Conclusion**:
- The correct answer is Option 1: Coleoptile and coleorhiza are extensions of the scutellum.