The light independent reactions are seen in:
I. ${\mathrm{C}}_3$ carbon fixation
II. ${\mathrm{C}}_4$ carbon fixation
III. Crassulacean acid metabolism

1. I and II only	2. I and III only
3. II and III only	4. I, II and III

In the light dependent reactions of photosynthesis:
1. NADPH is reduced to ${\mathrm{NADP}}^{+}$ by the enzyme NADP reductase.
2. initial carbon fixation takes place forming a 3 carbon compound.
3. ATP is not produced.
4. light is absorbed and energy is transported to reaction-center chlorophyll a

Photosystem I is directly associated with:
1. passing electrons to plastoquinone
2. receiving electrons from plastocyanin
3. P680 as the chlorophyll a reaction-center
4. removal of electrons and protons from water

Light dependent reactions are so called because they require light:

Identify the incorrect statement regarding the enzyme PEP carboxylase:
1. PEP carboxylase has a lower Km for bicarbonate ions, hence, higher affinity — than RuBisCO.
2. ${\mathrm{O}}_2$ is a very poor substrate for this enzyme.
3. It plays an important role in ${\mathrm{C}}_4$ cycle but not in CAM plants.
4. PEP carboxylase is also significant in non-photosynthetic metabolic pathways.

What can occur during both photosynthesis and respiration?

Identify the correct statement:
1. The light reactions provide ATP and NADPH to the Calvin cycle.
2. The light reactions provide ${\mathrm{CO}}_2$ to the Calvin cycle.
3. The light reactions supply oxygen to the Calvin cycle.
4. Calvin cycle is in no way dependent on the light reactions.

What is true for both light reactions and the Calvin cycle of photosynthesis in plants?
1. Production of molecular oxygen
2. Depend directly or indirectly on light
3. Requirement of ATP
4. Production of NADPH

Neither light dependent reaction nor Calvin cycle in photosynthesis in plants require:

If chloroplasts are illuminated with sunlight, the lowest pH would be observed in: