Which of the following statement is / are incorrect ?
(i) Green light falling in the range of wavelength 500 0 -580 nm is least effective for photosynthesis.
(ii) In non - cyclic photophosphorylation, the electron expelled from the reaction centre is not cycled back , though its loos is compensated by electrons from the photolysis of water .
(iii) Chl a , Chl b , carotenoids , and xanthophylls are insoluble in organic solvents.
(iv) 400-700 nm light is used in photosynthesis also known as PAR.
(v) Red light is the most effective for photosynthesis.

Options

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

Answer

To determine which statements are incorrect regarding photosynthesis, let's analyze each statement one by one.

### Step 1: Analyze Statement (i)
**Statement:** Green light falling in the range of wavelength 500 - 580 nm is least effective for photosynthesis.

- **Analysis:** This statement is correct. Green light is indeed less effective for photosynthesis compared to other wavelengths, particularly red and blue light.

### Step 2: Analyze Statement (ii)
**Statement:** In non-cyclic photophosphorylation, the electron expelled from the reaction centre is not cycled back, though its loss is compensated by electrons from the photolysis of water.

- **Analysis:** This statement is also correct. In non-cyclic photophosphorylation, electrons are not recycled; they are replaced by electrons derived from the splitting of water molecules.

### Step 3: Analyze Statement (iii)
**Statement:** Chl a, Chl b, carotenoids, and xanthophylls are insoluble in organic solvents.

- **Analysis:** This statement is incorrect. Carotenoids are soluble in organic solvents, while chlorophylls (Chl a and Chl b) are also soluble in organic solvents.

### Step 4: Analyze Statement (iv)
**Statement:** 400-700 nm light is used in photosynthesis, also known as PAR.

- **Analysis:** This statement is correct. The range of 400-700 nm is referred to as Photosynthetically Active Radiation (PAR) and is utilized in photosynthesis.

### Step 5: Analyze Statement (v)
**Statement:** Red light is the most effective for photosynthesis.

- **Analysis:** This statement is incorrect. While red light is effective, blue light is actually the most effective for photosynthesis.

### Conclusion
Based on the analysis:
- **Incorrect Statements:** (iii) and (v)

Thus, the answer to the question is that statements (iii) and (v) are incorrect.

### Final Answer
The incorrect statements are (iii) and (v).

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