Question

Choose the correct answer from the alternatives given.
The first step in photosynthesis is

• A. formation bf $NADP{H}_2$
• B. photolysis of water
• C. formation of ATP
• D. excitation of an electron of chlorophyll by a photon of light

Answer 1

The correct option is D excitation of an electron of chlorophyll by a photon of light

During the first stage of photosynthesis, called the light-dependent reaction, sunlight excites the electrons in the chlorophyll pigment. The organism uses this energy to create the energy carrier molecules ATP and NADPH, which are crucial for carbon fixing during the second stage.

Thus, the correct answer is 'Excitation of an electron of chlorophyll by a photon of light.'