Photosynthesis in Higher Plants

Q1. Chemiosmotic theory of ATP synthesis in the chloroplasts and mitochondria is based on:

1. Membrane potential.
2. Accumulation of Na ions.
3. Accumulation of K ions.
4. Proton gradient.

Q2. Photophosphorrylation in a chloroplast is mot similar to which of the following mitochondrial reaction?

1. Substrate-level phosphorylation.
2. Oxidative phosphorylation.
3. Oxidative decarboxylation.
4. Hydrolysis.

Q3. The process where by water moves through the plants is known as:

1. Transpiration.
2. Translocation.
3. Guttation.
4. Osmosis.

Q4. The idea that photosynthetic organisms require a source of hydrogen, was given by:

1. Ruben and Kamen.
2. Van Niel.
3. Arnold and Emerson.
4. Robin Hill.

Q5. Which of the following conducts water inside plant body?

1. Phloem.
2. Xylem.
3. Cortex.
4. Pith.

Q6. The wave lengths of red light are in the range of:

1. 400-500nm
2. 500-550nm
3. 600-650nm
4. 700-750nm

Q7. Which of the following products of light reaction of photosynthesis is not used in the dark reaction?

1. ATP.
2. NADPH.
3. Oxygen.
4. None of these.

Q8. Which of the following is a 4-carbon compound?

1. Oxaloacetic acid.
2. Phosphoglyceric acid.
3. Ribulose biphosphate.
4. Phosphoenolpyruvate.

Q9. How many turns of Calvin cycle yield one molecule of glucose?

1. 8
2. 2
3. 6
4. 4

Q10. In C plants, agranal chloroplasts are found in:

1. Bundle sheath cells.
2. Chloroplasts of guard cells.
3. Epidermal cell chloroplasts of green stem.
4. Mesophyll cells.

Q11. As a first identifiable product of the dark reaction is:

1. PGA
2. PGAL
3. RuBP
4. Glucose.

Q12. Oxygen gas released during photosynthesis is comes from:

1. Water.
2. CO
3. Glucose.
4. None of these.

Q13. Which of the following happens during light reaction?

1. Formation of ATP and NADPH.
2. Trapping of light energy.
3. Carbon fixation.
4. Formation of PGA.

Q14. Which is the primary CO acceptor in C plants?

1. RuBisco.
2. PEP.
3. RuBP.
4. NADPH.

Q15. Discovery of Emerson effect has already shown the:

1. Two distinct photochemical reactions.
2. Light and dark reactions of photosynthesis.
3. Photophosphorylation.
4. Photorespiration.

Q16. Which element is located at the centre of the porphyrin ring in chlorophyll?

1. Manganese.
2. Calcium.
3. Magnesium.
4. Potassium.

Q17. The enzyme that catalyses initial carbon dioxide fixation in C plants is:

1. RuBP carboxylase.
2. PEP carboxylase.
3. Carbonic anhydrase.
4. Carboxydismutase.

Q18. Of the total sunlight reaching the earth, the percentage used in the photosynthesis is:

1. 2%
2. 20%
3. 30%
4. 50%

Q19. Photosystem-II occurs in.

1. Stroma.
2. Cytochrome.
3. Grana.
4. Mitochondrial surface.

Q20. The water potential of all solutions as compared to pure water is always:

1. Higher.
2. Lower.
3. Equal.
4. None of these.

Q21. Bacterial photosynthesis does not show:

1. Evolution of oxygen.
2. Utilisation of ATP.
3. Formation of organic compounds.
4. Photosystem I.

Q22. Pigment acting as a reaction centre during photosynthesis is:

1. Carotene.
2. Phytochrome.
3. P700
4. Cytochrome.

Q23. In photosystem I reaction, chlorophyll can be shown as having P700. What does P700 signify?

1. Molecular weight of chlorophyll a.
2. Peak concentration of chlorophyll a.
3. Peak of absorption at 700 nm.
4. All of the above

Q24. Which of the following would occur when a plant cell is packed in a fluid with high osmotic concentration than
the cell sap?

1. Imbibition.
2. Plasmolysis.
3. Deplasmolysis.
4. Diffusion.

Q25. In photosynthesis energy from light reaction to dark reaction is transferred in the form of:

1. ADP.
2. ATP.
3. RuDP.
4. Chlorophyll.

Q26. In a CAM plant, the concentration of organic acid.

1. Increases during night.
2. Decreases or increases during day.
3. Decreases during the day.
4. Increases during the day.

Q27. The wavelengths of visible light are shorter than the wavelengths of:

1. Infrared.
2. Ultraviolet.
3. X-rays.
4. Gamma rays.

Q28. The first step of photosynthesis is:

1. Excitation of electron of chlorophyll by a photon of light.
2. Formation of ATP.
3. Attachment of CO to 5 carbon sugar.
4. Ionisation of water.

Q29. Which fractions of the visible spectrum of solar radiations are primarily absorbed by carotenoids of the higher
plants?

1. Violet and blue.
2. Blue and green.
3. Green and red.
4. Red and violet.

Q30. The water of guttation is forced out of the leaves by:

1. Diffusion.
2. Root Pressure.
3. Imbibition.
4. Active transport.