Arrange the following layers of microporangium according to outside .
(A) Endothecium
(B) Middle layer
(C) Tapetum
(D) Epidermis

Options

A. D, A, B ,C
B. B, A, C, D
C. D, C, B , A
D. C, B , A, D

Answer

To arrange the layers of the microsporangium from the outside to the inside, we need to identify the correct order of the layers mentioned in the question. The layers are:

(A) Endothecium
(B) Middle layer
(C) Tapetum
(D) Epidermis

### Step-by-Step Solution:

1. **Identify the Outermost Layer**: The outermost layer of the microsporangium is the **Epidermis**. This layer serves as a protective covering.

2. **Next Layer Inward**: After the epidermis, the next layer is the **Endothecium**. This layer is located just beneath the epidermis and plays a role in the dehiscence of the microsporangium.

3. **Following Layer**: The next layer after the endothecium is the **Middle Layer**. This layer is situated between the endothecium and the tapetum.

4. **Innermost Layer**: The innermost layer of the microsporangium is the **Tapetum**. This layer is responsible for nourishing the developing microspores.

5. **Final Arrangement**: Therefore, the correct arrangement of the layers from the outside to the inside is:
- (D) Epidermis
- (A) Endothecium
- (B) Middle layer
- (C) Tapetum

### Final Answer:
The correct order is **D, A, B, C**.