_______is the outer covering of endosperm which separates the embryo in monocotyledonous seed.

Options

A. Seed coat
B. Coleoptile
C. Coleorhiza
D. Aleurone layer

Answer

To answer the question, "_______ is the outer covering of endosperm which separates the embryo in monocotyledonous seed," we need to analyze the options provided and identify the correct term.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the name of the outer covering of the endosperm that separates the embryo in a monocotyledonous seed.

2. **Evaluating the Options**:
- **Option 1: Seed Coat**: The seed coat is the outermost layer of the seed, but it does not specifically refer to the covering of the endosperm. Therefore, this option is incorrect.
- **Option 2: Coleoptile**: The coleoptile is a protective sheath covering the emerging shoot (plumule) in monocots. It does not cover the endosperm. Hence, this option is also incorrect.
- **Option 3: Coleorhiza**: The coleorhiza is a protective sheath that covers the root (radicle) of germinating monocots. It is not related to the endosperm, making this option incorrect as well.
- **Option 4: Aleurone Layer**: The aleurone layer is indeed the outer covering of the endosperm in monocot seeds. It separates the embryo from the endosperm and plays a role in providing nutrients during germination.

3. **Conclusion**: Based on the evaluation of the options, the correct answer is **Aleurone Layer**.

### Final Answer:
**Aleurone Layer** is the outer covering of endosperm which separates the embryo in monocotyledonous seed.

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