The structures that are formed by stacking of organized flattered membrances sacs in the chloroplasts are

Options

A. grana
B. stroma lamellae
C. stroma
D. cristae

Answer

**Step-by-Step Solution:**

1. **Understanding Chloroplast Structure**: Begin by recognizing that chloroplasts are double membrane-bound organelles found in plant cells. They are responsible for photosynthesis.

2. **Identifying Key Components**: Within the chloroplast, there are two main components to focus on: the stroma and the thylakoids. The stroma is the fluid-filled space inside the chloroplast, while thylakoids are the membrane-bound structures.

3. **Thylakoid Arrangement**: Thylakoids are organized into stacks. These stacks are referred to as "grana" (singular: granum). Each granum consists of multiple thylakoids stacked on top of each other, resembling a pile of coins.

4. **Conclusion**: The structures formed by the stacking of organized flattened membrane sacs in the chloroplasts are called "grana".

**Final Answer**: The structures that are formed by stacking of organized flattened membrane sacs in the chloroplasts are called **grana**.

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