Question

During photosynthesis, light is not necessary for

• A. Electron transport
• B. excitement of chlorophyll molecule
• C. Photolysis
• D. Reduction of $C{O}_2$ to the level of carbohydrate

Answer 1

The correct option is D Reduction of $C{O}_2$ to the level of carbohydrate

Carbon dioxide from the atmosphere is reduced to form corbohydrates such as glucose during the light independent reaction or Dark reaction. This reaction does not require light as it utilizes energy genrated in the form of ATP and NADPH during the light dependent reaction.
Activation or excitation of chlorophyll occurs during the light dependent reaction. Chlorophyll becomes excited when it absorbs light energy in the form of a photon, causing one of its electrons to move to a higher energy state.
The excited electrons of chlorophyll are transported through a number of electron carriers to generate NADPH and ATP. This process is called electron transport or photophosphoylation.
Photolysis of water is the process of splitting of water molecule by utilizing energy from sunlight. The electrons obtained from spliting of water is utilized in returing the excited chlorophyll molecule to its normal state.