Read the given statements carefully and identify the wrong one.

Options

A. All plants have PGA as the first product of `CO_2` fixation
B. Within the chloroplast, protons in the stoma decrease in number , while in the lumen of thylakoid , there is accumulation of protons.
C. Strom lamellae membranes lack PS - II as well as NDAP reductase enzyme .
D. Carotenoids protect chlorophyll a from photo oxidation

Answer

To identify the wrong statement among the given options, let's analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement A: "All plants have PGA as the first product of CO2 fixation."**
- This statement is incorrect. While PGA (phosphoglyceric acid) is indeed produced during the Calvin cycle in C3 plants, it is not the first product of CO2 fixation in all plants. In C4 plants, the first product of CO2 fixation is oxaloacetate, which is then converted to malate or aspartate. Therefore, this statement is wrong.

2. **Statement B: "Within the chloroplast, the protons in the stroma decrease in number, while in the lumen of thylakoids, there is the accumulation of protons."**
- This statement is correct. During the light reactions of photosynthesis, protons are pumped from the stroma into the thylakoid lumen, leading to a decrease in proton concentration in the stroma and an accumulation in the lumen.

3. **Statement C: "Stromal lamellae lack PS II as well as NADP reductase enzyme."**
- This statement is also correct. The stromal lamellae do not contain photosystem II (PS II) or NADP reductase; these components are found in the thylakoid membranes.

4. **Statement D: "The carotenoids protect chlorophyll from photo-oxidation."**
- This statement is correct. Carotenoids play a protective role by absorbing excess light energy and preventing damage to chlorophyll from photo-oxidation.

### Conclusion:
After analyzing all the statements, we find that **Statement A** is the incorrect one. Therefore, the answer to the question is:

**Answer: Statement A is incorrect.**

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