Find out the incorrect statement from the following.

Options

A. Dark reaction depends on the product formed by light reaction.
B. In stroma, enzymatic reactions incorporates `CO_2` into the plant leading to the synthesis of sugar.
C. Purple and green sulphur bacteria use H2 S as hydrogen donor.
D. There is no division of labour in chloroplast.

Answer

To find the incorrect statement from the provided options, we will analyze each statement step by step.

### Step-by-Step Solution:

1. **Statement 1: Dark reaction depends on the product formed by light reaction.**
- The light reactions of photosynthesis produce ATP and NADPH, which are essential for the dark reactions (Calvin cycle). Therefore, this statement is **true**.

2. **Statement 2: In stroma, enzymatic reaction incorporates CO2 into the plant leading to the synthesis of sugar.**
- The stroma is the site of the Calvin cycle where CO2 is fixed and converted into glucose using ATP and NADPH produced in the light reactions. Thus, this statement is also **true**.

3. **Statement 3: Purple and green sulfur bacteria use H2S as hydrogen donor.**
- Purple and green sulfur bacteria indeed utilize hydrogen sulfide (H2S) as an electron donor during photosynthesis. This statement is **true**.

4. **Statement 4: There is no division of labor in chloroplasts.**
- This statement is **false**. Chloroplasts have distinct regions: the thylakoids (where light reactions occur) and the stroma (where dark reactions occur). This division of labor is crucial for the photosynthetic process.

### Conclusion:
The incorrect statement is **Statement 4: There is no division of labor in chloroplasts.**

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