Question

Blue and red light are equally effective in photosynthesis but blue light is less efficient because

• A. It is fluorescent.
• B. It has lesser wavelength than red light.
• C. Most of its energy is wasted in form of infra red radiation.
• D. It cannot bring photolysis of water and release of oxygen alone.

Answer 1

The correct option is D It cannot bring photolysis of water and release of oxygen alone.

• Trees and plants are green because of a green pigment called chlorophyll. This pigment absorbs red light the best and converts the light into energy that it uses for metabolism.
• However, the pigment doesn't strongly absorb blue or green light, so plants can't use this energy for photosynthesis.
• Hence, Blue and red light are equally effective in photosynthesis. but blue light is less efficient because it cannot bring photolysis of water and release of oxygen alone
• So, the correct answer is 'It cannot bring photolysis of water and release of oxygen alone'.