Question

Define the following
(a) Light reaction
(b) Quantum
(c) Dark reaction

Answer 1

(a) Light reaction is the first part of photosynthesis in which light (radiant) energy is used up to split water to produce ATP and NADPH molecules.
(b) The unit of light energy absorbed during photosynthesis in the form of photons is called quantum.
(c) The process of fixation of carbon dioxide or reduction of carbon dioxide to glucose is known as dark reaction.