Study the following statements.
(i) Red light falling in the ragne of wavelength 660-760nm is the most effective for photosynthesis.
(ii) Green light falling in the range of wavelength 500-580 nm is the least effective for photosynthesis.
(iii) Chl a,chl b carotenses and xanthophylls are soluble in organic solvents.
(iv) Phycobilins (phycocyanin, allophycocynin and phycoerythrin) are soluble in water
Which of the above statements is/are incorrect?

Options

A. ii and iii
B. iii and iv
C. i only
D. None of these

Answer

To determine which of the statements regarding photosynthesis in higher plants are incorrect, we will analyze each statement step by step.

### Step-by-Step Solution:

1. **Statement (i)**: "Red light falling in the range of wavelength 660-760 nm is the most effective for photosynthesis."
- **Analysis**: Red light is indeed effective for photosynthesis, particularly in the range of 600-700 nm. The specific range of 660-760 nm is often cited as particularly effective due to the absorption characteristics of chlorophyll.
- **Conclusion**: This statement is **correct**.

2. **Statement (ii)**: "Green light falling in the range of wavelength 500-580 nm is the least effective for photosynthesis."
- **Analysis**: Green light is poorly absorbed by chlorophyll, which reflects it, making plants appear green. Therefore, it is indeed the least effective wavelength for photosynthesis.
- **Conclusion**: This statement is **correct**.

3. **Statement (iii)**: "Chl a, chl b, carotenes, and xanthophylls are soluble in organic solvents."
- **Analysis**: Chlorophylls (a and b), carotenes, and xanthophylls are known to be fat-soluble and can be extracted using organic solvents like acetone and ethanol. They are not soluble in water.
- **Conclusion**: This statement is **correct**.

4. **Statement (iv)**: "Phycobilins (phycocyanin, allophycocyanin, and phycoerythrin) are soluble in water."
- **Analysis**: Phycobilins are indeed water-soluble pigments found in cyanobacteria and red algae. This is a key characteristic that distinguishes them from chlorophylls and carotenoids.
- **Conclusion**: This statement is **correct**.

### Final Conclusion:
After analyzing all four statements, we find that **none of the statements are incorrect**. Therefore, the answer to the question is that there are no incorrect statements.

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