First action spectrum of photosynthesis was described by:
1. Joseph Priestley
2. T. W. Engelmann
3. Robin Hill
4. C. B. van Neil

During oxygenic photosynthesis in chloroplasts, the liberated oxygen comes from ______ and the reactions leading to its liberation are associated with ______.
1. CO₂, PS II
2. H₂O, PSII
3. CO₂, Calvin cycle
4. H₂O, PS I

Where are the carriers of the electrons located in a chloroplast?
1. within thylakoid membranes
2. in the intra thylakoid space
3. within the inner membrane
4. in the intermembrane space [between outer and inner membrane]

Calvin cycle consumes more ATP than NADPH. What is the source of this extra ATP needed?
1. PS I
2. PS II
3. Cyclic electron flow
4. Linear electron flow

An increased leakiness of the thylakoid membrane will directly effect:
1. the photolysis of water
2. synthesis of ATP
3. electron flow from PSII to PSI
4. The reduction of NADP⁺

The catalytic knobs of ATP synthetase in a thylakoid membrane is located:
1. on the side facing the thylakoid space.
2. on the stroma side of the membrane.
3. embedded deep within the membrane
4. on the pigments molecules of Photosystems

Carbon dioxide provided to a C4 plant is radioactively labeled. As the photosynthesis in this plant gets underway, radioactivity if expected to occur first in:
1. Oxaloacetic acid
2. PEP
3. Malic acid
4. RuBP

Photorespiration is avoided by C₄ plants primarily because:
1. They do not participate in the Calvin cycle.
2. They use PEP carboxylase to initially fix CO₂.
3. They conserve water more efficiently.
4. They are adapted to cold, wet climates.

The correct sequence of flow of electron during light dependent reactions in plants is:
1. P680 → P700 → water → NADP+
2. water → P700 → NADP+→ P680
3. P700 → P680 → NADP+→ water
4. water → P680 → P700 → NADP⁺

The correct sequential involvement of organelles in the photorespiratory pathway is:
1. Chloroplast → Peroxisome → Mitochondria
2. Chloroplast → Mitochondria → Peroxisome
3. Mitochondria → Chloroplast → Peroxisome
4. Mitochondria → Peroxisome → Chloroplast