It is a double-membrane structure in which the outer membrane is more permeable than inner membrane. The inner membrane possesses more proteins. The outer membrane may be attached to ER. They are present in the cytoplasm of green algae and higher plants. Based on the given information, answer the given questions
Given the structure and location of the identified structure

Explanation

### Step-by-Step Solution:

1. **Identify the Structure**:
- The question describes a double-membrane structure with specific characteristics: the outer membrane is more permeable than the inner membrane, the inner membrane contains more proteins, and the outer membrane may be attached to the endoplasmic reticulum (ER).
- Based on these features, the identified structure is **chloroplast**.

2. **Explain the Function**:
- Chloroplasts are primarily involved in **photosynthesis**, which is the process by which plants convert sunlight into chemical energy.
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