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
✓✗How many electrons must be removed from water to release one molecule of O2?
- 1
- 2
- 4
- 8
General
✓✗The splitting of water molecules during photosynthesis is called
- phosphorylation
- carbon assimilation
- photolysis
- red drop
General
✓✗The sugar formed in the Calvin cycle is usually stored in plants as
- sucrose
- glycogen
- starch
- glucose
General
✓✗Read the statements and choose the correct option.
Statement I: C4 plants respond to higher temperatures with higher rates of photosynthesis.
Statement II: C3 plants have a much higher temperature optimum than C4 plants.
Statement I: C4 plants respond to higher temperatures with higher rates of photosynthesis.
Statement II: C3 plants have a much higher temperature optimum than C4 plants.
- Both Statement I and Statement II are true.
- Both Statement I and Statement II are false.
- Statement I is true but Statement II is false.
- Statement I is false but Statement II is true.
General
✓✗Which of the following is the correct sequence in the C4 pathway?
- malate + CO2 → OAA → PEP → RuBP (sheath) → Calvin cycle
- PEP + CO2 → OAA → malate → CO2 (sheath) → Calvin cycle
- OAA + CO2 → PEP → malate → pyruvate (sheath) → Calvin cycle
- RuBP + CO2 → 3-PGA → OAA → malate → PEP → Calvin cycle
General
✓✗The thick walls of bundle sheath cells in C4 plants help to
- transport sugars faster to the phloem
- keep the released CO2 from diffusing out
- store water during dry periods
- absorb more light for the light reactions
General
✓✗The C4 pathway concentrates CO2 at the site of
- PEP carboxylase
- the stomatal pore
- ATP synthase
- RuBisCO
General
✓✗A C3 plant is kept in light in air containing 50% O2 instead of the normal 21%. What will happen to its net photosynthesis?
- It will stop completely and the plant will release only O2.
- It will decrease because photorespiration increases.
- It will not change.
- It will increase.
General
✓✗The light harvesting complex (antenna) of each photosystem consists of
- only carotenoids and xanthophylls, without proteins
- the enzymes of the Calvin cycle and RuBisCO
- hundreds of pigment molecules bound to proteins
- a single molecule of chlorophyll a only
General
✓✗Increasing CO2 concentration up to about 0.05% increases CO2 fixation. Beyond this,
- only C3 plants are damaged
- the rate keeps increasing indefinitely
- it can be damaging over longer periods
- photosynthesis stops at once
General
✓✗The light harvesting complexes are located in the
- stroma
- outer chloroplast membrane
- lumen
- thylakoid membranes
General
✓✗Match List I with List II for a C4 plant.
| List I | List II |
| P. PEP | 1. Enzyme in mesophyll cells |
| Q. PEPcase | 2. Primary CO2 acceptor |
| R. Oxaloacetic acid | 3. Enzyme in bundle sheath cells |
| S. RuBisCO | 4. First stable product |
- P-2, Q-3, R-4, S-1
- P-4, Q-1, R-2, S-3
- P-1, Q-2, R-4, S-3
- P-2, Q-1, R-4, S-3
General
✓✗Photosynthetic pigments in the chloroplast are located in the
- thylakoid membranes
- chloroplast envelope
- matrix
- plastoglobules
General
✓✗The Calvin cycle is also called the
- Hatch and Slack cycle
- C3 cycle
- C4 cycle
- glycolate cycle