General
✓✗Arrange the following in the chronological order of their work: (1) Priestley (2) Ingenhousz (3) Sachs (4) van Niel
- 2, 1, 3, 4
- 1, 2, 3, 4
- 3, 1, 2, 4
- 1, 3, 2, 4
General
✓✗The Z scheme of the light reaction describes
- the reduction of NAD+ to NADH in the stroma
- the path of electrons from water through PS II and PS I to NADP+
- the reduction of CO2 to sugar in the Calvin cycle
- the regeneration of RuBP from triose phosphate
General
✓✗Match List I with List II.
| List I | List II |
| P. RuBP | 1. First stable product in C3 plants |
| Q. 3-PGA | 2. CO2 acceptor in C3 plants |
| R. RuBisCO | 3. Carboxylating enzyme in C3 plants |
| S. NADPH | 4. Reducing power for the Calvin cycle |
- P-2, Q-1, R-3, S-4
- P-3, Q-1, R-2, S-4
- P-2, Q-3, R-1, S-4
- P-1, Q-2, R-3, S-4
General
✓✗The primary CO2 acceptor in the Calvin cycle is a
- 3-carbon compound
- 6-carbon sugar
- 5-carbon ketose sugar
- 2-carbon compound
General
✓✗In the C4 pathway, regeneration of PEP from the 3-carbon molecule takes place in the
- mesophyll cells
- xylem
- stroma of bundle sheath chloroplasts
- bundle sheath cells
General
✓✗Observe the figure. Identify the stages labelled A, B and C.
- A - Carboxylation, B - Regeneration, C - Reduction
- A - Reduction, B - Decarboxylation, C - Regeneration
- A - Carboxylation, B - Reduction, C - Regeneration
- A - Reduction, B - Carboxylation, C - Regeneration
General
✓✗Compared with temperate plants, tropical plants have
- a lower temperature optimum for photosynthesis
- a higher temperature optimum for photosynthesis
- the same temperature optimum
- no temperature optimum
General
✓✗In CAM plants, the source of CO2 for the Calvin cycle during the day is
- malic acid
- 3-PGA
- pyruvate
- RuBP
General
✓✗Which is the first CO2-fixing enzyme in C4 plants?
- PEP carboxylase
- RuBisCO
- phosphoric acid
- RuDP carboxylase
General
✓✗The breakdown of the proton gradient provides energy that causes a conformational change in
- the CF1 particle of ATP synthase
- RuBisCO
- the CF0 particle only
- PS II
General
✓✗The O2 evolved in photosynthesis comes from water. Which pair of elements is involved in this reaction?
- magnesium and molybdenum
- manganese and chlorine
- magnesium and chlorine
- manganese and potassium
General
✓✗The mechanism of ATP formation in both chloroplasts and mitochondria is explained by the
- Cholodny-Went model
- relay pump theory of Godlewski
- Munch's mass flow hypothesis
- chemiosmotic theory
General
✓✗Which of the following correctly explains why both ATP and NADPH are needed from the light reaction?
- NADPH is used to make ATP in the stroma.
- ATP is needed only to split water and NADPH only to make O2.
- The Calvin cycle uses ATP for phosphorylation and NADPH for reduction.
- Both are used only in photorespiration.
General
✓✗Which feature is NOT true of bundle sheath cells in C4 plants?
- They have no intercellular spaces.
- They have a large number of chloroplasts.
- They have thick walls impervious to gaseous exchange.
- They are rich in PEP carboxylase.
General
✓✗A potted plant with a variegated leaf is kept in the dark and then in sunlight, and the leaf is tested with iodine. Starch is found
- nowhere in the leaf
- only in the green parts
- in the whole leaf
- only in the white parts