Question

Which of the following statements regarding photosynthesis are true and which are false? T = true and F = false.

A) resonance energy transfer does not include the transfer of an electron

B) the P680 reaction center in photosystem II can extract electrons from water because the redox potential of "activated" P680 has a redox potential more positive than that of water.

C) two photons must be captured to move an electron from water to NADP⁺ during oxygenic photosynthesis

D) cyclic electron flow occurs when the chloroplast's need for NADPH is greater than its need for ATP.

Answer 1

A. True

Resonance energy transfer means energy from a molecule is passed onto other. It doesnot occur by transfer of electrons but by the transfer of energy from the excited electron of a molecule to the electron of other molecule which make it excited.

B. True

Electron transfer occurs from molecule having low redox potential to higher redox potential , so photo system 2 need to have more positive potential than water.

C. True

In oxygen photosynthesis , there is involvement of both photo system. For transfer of 1 electron each photo system require 1 photon. In total 2 required.

D. False

In cyclic electron flow , only ATP is produced . No NADPH is produced. So this pathway will occur when there is greater need for ATP instead of NADPH.