In a chloroplast the highest number of protons are found in

Options

A. Lumen of thylakoids
B. Inter membrane space
C. Antennae complex
D. Stroma

Answer

To answer the question "In a chloroplast, the highest number of protons are found in," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Chloroplasts**:
- Chloroplasts are organelles in plant cells where photosynthesis occurs. They contain structures such as thylakoids, stroma, and an inner membrane space.

2. **Identify the Process of Photosynthesis**:
- Photosynthesis consists of two main stages: the light reactions and the dark reactions (Calvin cycle). The light reactions occur in the thylakoid membranes and involve the absorption of light energy.

3. **Know the Role of Water in Light Reactions**:
- During the light reactions, water (H2O) undergoes photolysis, which is the process of breaking down water molecules into oxygen (O2), protons (H+), and electrons (e-).

4. **Determine Where Protons are Generated**:
- The photolysis of water occurs in the thylakoid lumen, leading to the release of protons into this space.

5. **Compare the Locations**:
- The options provided are:
- A) Lumen of thylakoids
- B) Inner membrane space
- C) Antenna complex
- D) Stroma
- Among these, the thylakoid lumen is where the highest concentration of protons is found due to the photolysis of water.

6. **Conclude the Answer**:
- Therefore, the correct answer is **A) Lumen of thylakoids**.