Needs help on this Photosynthesis and How Cell harvest Chemical energy questions

Biology Questions on Photosynthesis and How Cells Harvest Chemical Energy
Question 1

In the reaction, NADH + H+ + FAD -----> NAD+ + FADH2, which reactant is reduced as the reaction proceeds to the right?
Answer
NADH
FAD
NAD+
FADH2
Question 2

A cell in an environment that did not contain oxygen but did contain food. In such situation, a cell could not
Answer
extract energy from food
perform glycolysis
utilize the Krebs cycle and Electron Transport Chain
utilize the Electron Transport Chain but coud utilize Krebs cycle

Question 3

Which of the following statements is true during photosynthesis?
Answer
CO2 gets reduced to glucose.
Glucose gets reduced to CO2.
Glucose gets oxidized to CO2.
CO2 gets oxidized to glucose.

Question 4

Which of the following serves as the final hydrogen (and electron) acceptor in aerobic respiration?
Answer
O2
CO2
cytochromes
NAD+

Question 5

The widespread planting of trees on barren soil would
Answer
decrease the CO2 in the atmosphere and thus decrease the global warming trend.
increase the CO2 in the atmosphere and thus increase the global warming trend.
decrease the CO2 in the atmosphere and thus increase the global warming trend.
increase the CO2 in the atmosphere and thus decrease the global warming trend.