Which of the following types of light are strongly absorbed by plants?
(a) Violet and orange (b) Blue and red (c) Indigo and yellow (d) Yellow and violet
(b) Photosynthesis occurs between wavelengths of about 400 nm and 750 nm. Red and blue colour wavelength is categories in this wavelength. So, plants absorb these colours. Photosynthesis does not occur in the infra-red or in ultraviolet light.
