In photosynthesis

Options

A. `ATP` is formed in light reaction and glucose in dark reaction
B. Both `ATP` and glucose are produced in dark reaction
C. Both `ATP` and glucose are produced in light reaction
D. Both `ATP` and glucose are formed in light and dark.

Answer

**Step-by-Step Solution:**

1. **Understanding Photosynthesis**: Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy into chemical energy stored in glucose. It primarily occurs in two stages: the light reactions and the dark reactions (Calvin cycle).

2. **Light Reactions**: The light reactions take place in the thylakoid membranes of the chloroplasts. When light is absorbed by chlorophyll, it energizes electrons, which leads to the splitting of water molecules (photolysis). This process produces ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate).

3. **Dark Reactions (Calvin Cycle)**: The dark reactions occur in the stroma of the chloroplasts and do not require light directly. Instead, they utilize the ATP and NADPH produced during the light reactions to fix carbon dioxide (CO2) and ultimately produce glucose.

4. **Analyzing the Options**:
- **Option 1**: ATP is formed in light reaction and glucose in dark reaction. (This is correct)
- **Option 2**: Both ATP and glucose are produced in dark reaction. (Incorrect)
- **Option 3**: Both ATP and glucose are produced in light reaction. (Incorrect)
- **Option 4**: Both ATP and glucose are formed in light and dark. (Incorrect)

5. **Conclusion**: The correct answer is that ATP is formed in the light reaction and glucose is produced in the dark reaction.

**Final Answer**: ATP is formed in the light reaction and glucose is produced in the dark reaction.

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