Given below are the events of photosynthesis. Identify which of the following is/are not true?
(i) Absorption of light energy by chlorophyll.
(ii) The assimilatory power in the form of NADPH and ATP are produced during dark phase.
(iii) Reduction of carbon dioxide to carbohydrates takes place during dark phase.
(iv) Conversion of chemical energy to radiant energy and splitting of water molecules into hydrogen and oxygen.

Options

A. (i) and (ii) only
B. (ii) only
C. (ii) and (iii) only
D. (ii) and (iv) only

Answer

To solve the question regarding the events of photosynthesis and identify which statements are not true, we can analyze each statement step by step.

### Step-by-Step Solution:

1. **Statement (i): Absorption of light energy by chlorophyll.**
- **Analysis:** This statement is true. Chlorophyll, the green pigment in plants, is responsible for absorbing light energy, which is essential for the process of photosynthesis.

2. **Statement (ii): The assimilatory power in the form of NADPH and ATP are produced during the dark phase.**
- **Analysis:** This statement is not true. NADPH and ATP are produced during the light phase of photosynthesis, not the dark phase. The dark phase (Calvin cycle) uses these products to convert carbon dioxide into carbohydrates.

3. **Statement (iii): Reduction of carbon dioxide to carbohydrates takes place during the dark phase.**
- **Analysis:** This statement is true. The reduction of carbon dioxide to carbohydrates occurs during the dark phase (Calvin cycle) of photosynthesis, where the energy stored in NADPH and ATP is utilized.

4. **Statement (iv): Conversion of chemical energy to radiant energy and splitting of water molecules into hydrogen and oxygen.**
- **Analysis:** This statement is not true. In photosynthesis, light energy is converted into chemical energy (not the other way around), and the splitting of water molecules (photolysis) occurs during the light phase, producing oxygen and hydrogen.

### Conclusion:
The statements that are not true are:
- Statement (ii): The assimilatory power in the form of NADPH and ATP are produced during the dark phase.
- Statement (iv): Conversion of chemical energy to radiant energy and splitting of water molecules into hydrogen and oxygen.

### Final Answer:
The statements that are not true are (ii) and (iv).

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