Question

Due the light reactions of photosynthesis energy from light is used to split water molecules. Which of the following is/are NOT a product of the light reactions? Select all the apply.

select all:

atp

co2

adp

hydrogen ions

oxygen ions

NADP+

NADPH

Answer 1

during light reactions of photosynthesis energy from light is used to split water molecules.

water is converted to 2H+, 2 electrons and one oxygen molecule.

the electrons from the water replace the electrons lost from the PSII, the electrons from the PSII are transported via electron transport chain and using the energy of electrons H+ is pumped into the thylakoid space, so than an H+ gradient is produced, the energy of the H+ gradient is used to make ATP by the ATP synthase on the thylakoid membrane.

electrons move through the electron transport chain and finally reach the NADP+, the NADP+ is reduced to NADPH.

so ATP, NADPH, oxygen molecule, H+ are products of light reactions.

so ADP, oxygen ions, NADP+, CO2, are not the products of light reactions.

so the answers are ADP, oxygen ions, NADP+, CO2.