Photosynthesis MCQ (Multiple Choice Questions and Answers)
Q1. How much energy is utilized in the synthesis of one gram mole of glucose
- 673 kcal
- 686 kcal
- 666 kcal
- 696 kcal
Answer: 2
Q2. The number of light quanta required for evolution of one molecule of oxygen is called
- Oxygen yield
- Photosynthetic yield
- Quantum yield
- Organic yield
Answer: 3
Q3. Red drop is
- Drop in oxygen yield
- Drop in quantum yield
- Drop in organic yield
- Drop in photosynthetic yield
Answer: 4
Q4. Red drop occurs in wavelength of
- 492 nm
- 535 nm
- 586 nm
- 680 nm
Answer: 4
Q5. Emerson effect indicates the existence of
- Two pigment systems
- Two photosynthetic units
- Two photophosphorylations
- None of the above
Answer: 1
Q6. In light phase of photosynthesis there is formation is
- ATP
- NADPH2
- Both ATP and NADPH2
- Carbohydrates
Answer: 3
Q7. The photosynthetic unit having 250 chlorophyll molecules is called
- Photon
- Quantum
- Quantasome
- Oxysomes
Answer: 3
Q8. Photosynthesis proceeds in sequence of
- Dark phase and light phase
- Light phase alone
- Light phase and dark phase
- Dark phase alone
Answer: 3
Q9. Light phase consists of
- Two photochemical reactions
- Two photosynthesis units
- Two chloroplast parts
- None of the above
Answer: 1
Q10. Light energy is converted into chemical energy through the formation of
- NADPH2
- ATP
- ATP and NADPH2
- None of the above
Answer: 3
Q11. Photophosphorylation consists of
- Cyclic and non-cyclic phosphorylation
- Oxidative phosphorylation
- Substrate phosphorylation
- None of the above
Answer: 1
Q12. The by-product of photosynthesis is
- Organic compound
- Oxygen
- Water
- Energy
Answer: 2
Q13. Stroma is the ground matrix of
- Lysosomes
- Oxysomes
- Ribosomes
- Chloroplast
Answer: 4
Q14. In C4-plants, photosystem II is absent in chloroplasts of
- Mesophyll cells
- Bundle sheath cells
- Palisade cells
- Spongy cells
Answer: 2
Q15. In C4-plants, calvin cycle enzymes are absent in
- Mesophyll chloroplast
- Bundle sheath chloroplast
- Guard cell chloroplast
- Epidermal chloroplast
Answer: 1
Q16. The carbon dioxide acceptor in CAM plants is
- Malic acid
- Oxalo-acetic acid
- Pyruvic acid
- Phosphoenol pyruvic acid
Answer: 4
Q17. The first stable product in CAM/C4 plants is
- Starch
- Oxalo-acetic acid
- Sugar
- Malic acid
Answer: 4
Q18. The co-operative photosynthesis is found in
- C4-plants
- C3-plants
- C2-plants
- Succulents
Answer: 1
Q19. The sugar formed at photosynthetic site is
- Utilized
- Stored
- Transported
- Assimilated
Answer: 3
Q20. The energy change in photosynthesis is from
- Light energy to electrical energy
- Light energy to molecular energy
- Light energy to chemical energy
- Light energy to activation energy
Answer: 3
Q21. When chlorophyll absorbs light, it gets excited and emits (release)
- Oxygen
- Water
- Electrons
- Energy rich compounds
Answer: 3
Q22. The excess energy of electron is used in the synthesis of
- Organic compounds
- ATP from ADP and iP
- NADPH2 from NADP
- None of the above
Answer: 2
Q23. The excess energy of electron is used in the synthesis of ATP and the process is called
- Oxidation phosphorylation
- Substrate phosphorylation
- Photophosphorylation
- Phosphorylation
Answer: 4
Q24. Grana are absent in the chloroplasts of
- Shrubs
- Herbs
- Algae
- Trees
Answer: 3
Q25. Kranz anatomy is found in
- Stems of C4 plants
- Stems of C3 plants
- Leaves of C4 plants
- Leaves of C3 plants
Answer: 3
Q26. C40H56 is the empirical formula of
- Chlorophyll b
- Carotene
- Xanthophylls
- Anthocyanin
Answer: 2
Q27. C40H56O2 is an empirical formula of a
- Xanthophylls
- Carotene
- Anthocyanin
- Chlorophyll
Answer: 1
Q28. Calvin cycle operates in chloroplasts. Where does Hatch-Slack pathway occur
- Mitochondria
- Golgi bodies
- Chloroplasts
- Cytoplasm
Answer: 3
Q29. Emerson effect is related to
- Decrease in photosynthesis in presence of high light intensity
- Decrease in photosynthesis when lights of two different wavelengths are provided together
- Increase in photosynthesis in presence of monochromatic light
- Increase in photosynthesis when lights of two different wavelengths are provided together
Answer: 4
Q30. Which one is directly involved in light reaction of photosynthesis
- Chlorophyll a
- Chlorophyll b
- Carotenoids
- All the above
Answer: 1
Q31. Autumnal leaf colour is due to
- Chlorophyll a
- Carotenoids
- Anthocyanins
- Betacyanin
Answer: 2
Q32. Photosynthesis pigments are located in the chloroplast in
- Intrathylakoid space
- Thylakoid membranes
- Intermembrane space
- Inner membrane of envelope
Answer: 2
Q33. Electron carriers involved in photophosphorylation are located in
- Outer chloroplast membrane
- Inner chloroplast membrane
- Stroma
- Thylakoid membranes
Answer: 4
Q34. Source of proton within the chloroplast is
- Water
- Excited chlorophyll
- Carbon dioxide
- Rubisco
Answer: 1
Q35. In cyclic photophosphorylation the electron released by reaction centre is ultimately accepted by
- Ferredoxin
- NADP+
- Reaction centre
- Plastocynanin
Answer: 3
Q36. In noncyclic photophosphorylation the electron released by P680 is replaced by
- Plastoquinone
- Water
- CO2
- NADP+
Answer: 2
Q37. Plants do not store carbohydrate as glucose but do so as starch because glucose
- Is unstable
- Attracts herbivores
- Will change nucleic acids
- Alters osmotic balance
Answer: 4
Q38. Decline in quantum yield was noticed by Emerson at a wavelength of
- 400-450 nm
- 600-650 nm
- 650-680 nm
- More than 680 nm
Answer: 4
Q39. Chemosynthetic bacteria obtain energy from
- Sun
- Infra-red rays
- Organic substance
- Inorganic chemicals
Answer: 4
Q40. Photosynthetic autotrophs get their energy requirement from
- Heat
- Light
- Inorganic chemicals
- Organic chemicals
Answer: 2
Q41. A heterotrophy obtains its carbon supply from
- Organic chemicals
- CO2
- Methane
- Cyanide
Answer: 1
Q42. In 1772, Joseph Priestley demonstrated tht
- Plants foul the air
- Animals purify the air during day time
- Plants and animals restore air for each other
- Plants get killed in the air produced by animals
Answer: 3
Q43. The first hypothesis that oxygen released during photosynthesis is derived from water, was proposed by
- Engelmann
- Priestley
- Van Niel
- Blackman
Answer: 3
Q44. Dark reaction of carbon assimilation occur in
- Cytoplasmic matrix
- Mitochondria
- Leucoplasts
- Chloroplasts
Answer: 4
Q45. Chlorophyll b differs from chlorophyll a in that it does not
- Become oxidized
- Become reduced
- Become excited
- Produced excited electrons
Answer: 1
Q46. NADPH is produced in photosynthesis during
- Dark reaction
- Noncyclic photophosphorylation
- Pseudocyclic photophosphorylation
- Cyclic photophosphorylation
Answer: 2
Q47. Energy required for ATP synthesis in ps II comes from
- Proton gradient
- Electron gradient
- Reduction of glucose
- Oxidation of glucose
Answer: 1
Q48. The process of photophosphorylation is similar to mitochondrial reaction called
- Substrate-level phosphorylation
- Oxidative phosphorylation
- Carbohydrate phosphorylation
- Hydrolysis of phosphorylated compounds
Answer: 2
Q49. Excited pigments molecule shifts an electron in an outer orbit having
- Less energy
- More energy
- Lesser spin
- More spin
Answer: 2
Q50. Chlorophyll consists of
- A head of phytol and tail of four pyrrole rings
- A head of linked carbons and tail of four pyrrole rings
- A head of four pyrrole rings and tail of inked nitrogens
- A head of four pyrrole rings and an alocoholic phytol tail
Answer: 4
Q51. Electron donor to PSI is
- Ferredoxin
- FeS centre
- Plastoquinone
- Plastocyanin
Answer: 4
Q52. Photosynthesis (nourishment in light) was discovered by
- Stephen Hales
- Priestley
- Ingenhousz
- Van Mayer
Answer: 3
Q53. Chlorophyll was first extracted by
- Van Mayer
- Pelletier and caventou
- Willstatter and stoll
- Senebier
Answer: 2
Q54. The source of hydrogen for carbon assimilation is
- NADPH
- FADH2
- H2O
- RuBP
Answer: 1