Question

Study the following statements.
(i) Red light falling in the range of wavelength 660-760 nm 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, carotenes and xanthophylls are soluble in organic solvents.
(iv) Phycobilins (phycocyanin, allophycocyanin and phycoerythrin) are soluble in water.
Which of the above statement is/are incorrect?

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

Answer 1

The correct option is D None of these

a. Photosynthetic pigments absorb visible part of the radiation( 380nm to 760nm). For example, chlorophyll absorbs blue and red light. Usually, plants show a high rate of photosynthesis in blue and red light. Maximum photosynthesis has been observed in red light than in blue light. The green light has a minimum effect.

b. Chl a is a bluish green whereas chl b is olive green in a pure state. They are soluble in organic solvents.

c. The phycobilins constitute a major group of photosynthetic pigments occurring in blue-green algae, cryptomonads and algae. These water-soluble pigments are thought to be localized in small granules, called phycobilisomes, attached to thylakoids.

So, the correct answer is 'none of these'.