The final electron acceptor associated with photosystem I is. oxygen water NADP+ NADPH Question 13 (2 points) What is the relationship between the wavelength of light and the quantity of energy per photon? they have a direct, linear relationship they are inversely related they are logarithmically related O they are separate things-no relationship Why are C4 plants able to avoid photorespiration? they don't participate in the Calvin cycle PEP carboxylase, an enzyme which has no affinity for 02, initially fixes CO2 they conserve water more efficiently they keep their stomata closed most of the day Question 15 (4 points) What would be the advantage of looking for crop plants with mutations that allow plants to avoid photorespiration?