Developing pollen obtains its nutrition from
(a) Endothecium
(b) Tapetum
(c) Epidermis
(d) Middle layer

Options

A. Endothecium
B. Tapetum
C. Epidermis
D. Middle layer.

Answer

To solve the question "Developing pollen obtains its nutrition from," we need to analyze the options provided and understand the role of each layer of the anther in pollen development.

### Step-by-Step Solution:

1. **Understand the Structure of Anther**:
The anther is composed of four layers: epidermis, endothecium, middle layer, and tapetum. Each of these layers has a specific function.

2. **Evaluate Each Option**:
- **(a) Endothecium**: This layer is responsible for the dehiscence of the anther (the release of pollen) but does not provide nutrition to developing pollen.
- **(b) Tapetum**: This is the innermost layer of the anther and plays a crucial role in providing nutrition to the developing pollen grains. The cells of the tapetum are usually multinucleate and have a polyploid nucleus, which aids in nutrient supply.
- **(c) Epidermis**: This is the outermost layer of the anther and primarily serves as a protective layer. It does not provide nutrition to the pollen.
- **(d) Middle Layer**: This layer is present between the tapetum and the endothecium but does not contribute to the nutrition of the pollen grains.

3. **Identify the Correct Answer**:
Based on the analysis, the tapetum is the layer that provides nutrition to the developing pollen grains. Therefore, the correct answer is **(b) Tapetum**.

### Final Answer:
(b) Tapetum

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