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 will follow these steps:

1. **Identify the Layers**: The layers of the microsporangium we need to arrange are:
- (A) Endothecium
- (B) Middle layer
- (C) Tapetum
- (D) Epidermis

2. **Understand the Structure**: The microsporangium is a structure that contains microspores (pollen grains) and is typically surrounded by four layers. We need to determine the order of these layers from the outermost to the innermost.

3. **Determine the Outermost Layer**: The outermost layer of the microsporangium is the **Epidermis (D)**. This layer serves as a protective covering.

4. **Identify the Next Layer**: The layer beneath the epidermis is the **Endothecium (A)**. This layer has cells that develop thickenings to provide structural support.

5. **Identify the Middle Layer**: Following the endothecium, we have the **Middle Layer (B)**, which consists of 2 to 4 cells.

6. **Identify the Innermost Layer**: The innermost layer is the **Tapetum (C)**. This layer is responsible for providing nutrition to the developing pollen grains and may be multinucleate.

7. **Final Arrangement**: Based on our analysis, the correct order from the outside to the inside is:
- (D) Epidermis
- (A) Endothecium
- (B) Middle layer
- (C) Tapetum

Thus, the correct arrangement of the layers of the microsporangium from the outside to the inside is **D A B C**.