Select incorrect statetment

Options

A. Each phoyosytem has all the pigments except one molecule of chlorophyll a
B. Action spectra is greater in blue and red light
C. Chlorophyll a & b are primay pigments associated with photosynthesis
D. PS II is involved in evolution of ` O_(2)`

Answer

To solve the question of selecting the incorrect statement regarding photosynthesis, we will analyze each statement provided:

1. **Statement 1**: Each photosystem has all the pigments except one molecule of chlorophyll a.
- This statement is true. Both photosystems (I and II) contain various pigments, but they differ in the specific chlorophyll a molecule that acts as the reaction center.

2. **Statement 2**: Action spectra is greater in blue and red light.
- This statement is also true. Chlorophyll absorbs light most efficiently in the blue and red regions of the spectrum, leading to a higher action spectrum in these areas.

3. **Statement 3**: Chlorophyll a and b are primary pigments associated with photosynthesis.
- This statement is incorrect. While chlorophyll a is indeed the primary pigment necessary for photosynthesis, chlorophyll b functions as an accessory pigment. It assists in capturing light but is not essential for the process to occur.

4. **Statement 4**: Photosystem II involves the evolution of gas.
- This statement is true. Photosystem II is responsible for the splitting of water molecules, which leads to the release of oxygen gas.

Based on the analysis, the incorrect statement is:

**Answer**: Statement 3: "Chlorophyll a and b are primary pigments associated with photosynthesis."