Question

Maximum and minimum photosynthesis takes place in (respectively)
(a) Red and Blue light
(b) Blue and Red light
(c) Red and Green light
(d) Blue and Green light

Answer 1

Hint: Photosynthesis is a process used by plants and other organisms to convert light energy into the chemical energy that can later be released to fuel the organisms. In plants, photosynthesis takes place in chloroplasts of the leaves, which contain the chlorophyll.

Complete answer:
Maximum and minimum photosynthesis takes place in the blue and green light, respectively. Since the photosynthesis takes place in the chloroplast that has chlorophyll. The rate of photosynthesis is affected by the color of light that is absorbed the best by the chlorophyll pigment. Chlorophyll absorbs blue and red light energies with the greatest efficiency. The color that has the highest influence on photosynthesis is the blue color. The red light is next best for photosynthesis.
The leaves of a plant are green because the chlorophyll within them absorb all other wavelengths of light and reflect only the green light. In the absorption spectrum, it can be shown that red light and blue light are absorbed the most whereas the green light is most commonly reflected. Therefore minimum photosynthesis takes place in green light.
So, the correct answer is, ‘Blue and Green light.’.

Additional Information:
- The chloroplasts are absent in blue- green algae and photosynthetic bacteria.
- The chloroplasts are semiautonomous (independent to some extent) and self- replicating organelle.
- The plant growers use blue lights to grow plants indoors.

Note: The portion of the spectrum between 400 nm and 700 nm is called photosynthetically active radiation. This can be represented by the help of two spectrums called absorption and action spectrum. Absorption spectrum, which is the graphical representation of the quantity of light of different wavelengths absorbed by the pigment. The action spectrum represents the rate of photosynthesis at a different wavelength of light.