Read the given paragraph.
Photosynthesis in plants consists of two phases: X and Y. Phase X requires light energy and occurs in granum of chloroplast whereas phase Y is light independent and occurs in stroma of chloroplast. Which of the following holds true regarding phases X and Y of photosynthesis?
Read the given paragraph.
Photosynthesis in plants consists of two phases: X and Y. Phase X requires light energy and occurs in granum of chloroplast whereas phase Y is light independent and occurs in stroma of chloroplast. Which of the following holds true regarding phases X and Y of photosynthesis?
Photosynthesis in plants consists of two phases: X and Y. Phase X requires light energy and occurs in granum of chloroplast whereas phase Y is light independent and occurs in stroma of chloroplast. Which of the following holds true regarding phases X and Y of photosynthesis?
A
In phase X, light energy is used up in photolysis of water and molecular oxygen is evolved.
B
In phase Y, electrons and protons are used up in synthesis of assimilatory power.
C
Assimilatory power generated in phase Y is used up in phase X to convert `CO_2` into carbohydrates.
D
Phase X utilises carbon dioxide gas of atmosphere whereas phase Y evolves oxygen gas that escapes into atmosphere.
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### Step-by-Step Solution:
1. **Understanding Photosynthesis**:
- Photosynthesis is the process by which plants convert light energy into chemical energy, producing food (glucose) and oxygen as by-products.
- It consists of two main phases: the light-dependent reactions (Phase X) and the light-independent reactions (Phase Y).
2. **Identifying the Phases**:
- **Phase X (Light Phase)**:
- Requires light energy.
- Occurs in the granum (stacks of thylakoids) of chloroplasts.
- In this phase, water (H2O) is split (photolysis) to release oxygen (O2) and generate energy carriers like ATP and NADPH.
- **Phase Y (Dark Phase)**:
- Does not require light (light-independent).
- Occurs in the stroma of chloroplasts.
- Utilizes ATP and NADPH produced in Phase X to convert carbon dioxide (CO2) into glucose.
3. **Analyzing the Options**:
- The question asks which statements hold true regarding phases X and Y of photosynthesis.
- Based on the definitions and processes of both phases, we can evaluate the provided options.
4. **Evaluating Each Option**:
- **Option A**: Correct. Phase X uses light energy to split water and release oxygen.
- **Option B**: Incorrect. Electrons and protons are generated in Phase X, not Phase Y.
- **Option C**: Incorrect. Assimilatory power (ATP, NADPH) is generated in Phase X and used in Phase Y.
- **Option D**: Incorrect. Phase X does not utilize carbon dioxide; it releases oxygen.
5. **Conclusion**:
- The correct answer regarding the phases of photosynthesis is **Option A**.
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