Photosynthesis – Old Year Questions

1. Which of the following is not a component of chlorophyll?

(a) Calcium
(b) Carbon
(c) Magnesium
(d) Hydrogen
(e) None of the above/More than one of the above

[66th B.P.S.C. (Pre) (Re. Exam) 2020]


2. Which of the following elements is present in chlorophyll–

(a) Iron
(b) Copper
(c) Magnesium
(d) Manganese

[U.P.P.C.S. (Pre) 2012]


3. Chlorophyll contains –

(a) Iron
(b) Copper
(c) Magnesium
(d) Manganese

[U.P. Lower Sub. (Pre) 2013]


4. The by-product of photosynthesis is

(a) CO2
(b) O2
(c) energy
(d) sugar
(e) None of the above/More than one of the above

[65th B.P.S.C. (Pre) 2019]


5. It happens during the photosynthesis in green plants :

(a) Taking nitrogen and releasing oxygen
(b) Taking CO2 and releasing oxygen
(c) Taking oxygen and releasing CO2
(d) Taking oxygen and releasing nitrogen

[R.A.S./R.T.S. (Pre) 1992]


6. What is the formula of glucose?

(a) C6H22O11
(b) C6H10O5
(c) C6H12O6
(d) C6H6O6
(e) None of the above/More than one of the above

[65th B.P.S.C. (Pre) 2019]


7. Which one of the following gases is used by plants in photosynthesis ?

(a) Ammonia
(b) Carbon dioxide
(c) Chlorine
(d) Sulphur dioxide

[Uttarakhand P.C.S. (Pre) 2002]


8. During photosynthesis, green plants absorb :

(a) Oxygen
(b) Nitrogen
(c) Carbon monoxide
(d) Carbon dioxide
(e) None of the above/More than one of the above

[66th B.P.S.C. (Pre) (Re. Exam) 2020]


9. Which one of the following gases is essential for photosynthesis process?

(a) CO
(b) CO2
(c) N2
(d) O2

[43rd B.P.S.C. (Pre) 1999]
[U.P.P.C.S (Pre) 2011]


10. Which one of the following is not required for photosynthesis process?

(a) Sunlight
(b) Oxygen
(c) Water
(d) Carbon dioxide

[U.P. R.O./A.R.O. (Pre) 2017]


11. Oxygen, which is liberated during photosynthesis, comes from :

(a) Water
(b) Carbon dioxide
(c) Chlorophyll
(d) Phosphoglyceric acid

[U.P. R.O./A.R.O. (Mains) 2014]


12. The radiant energy absorbed by the plants results in –

(a) Photolysis of water
(b) Oxidation of chlorophyll
(c) Reduction of oxygen
(d) Oxidation of carbon dioxide

[R.A.S./R.T.S. (Pre) 1999]


13. Most of the oxygen on earth is produced by :

(a) Grasses
(b) Algae
(c) Trees
(d) Paddy fields

[U.P. Lower Sub. (Pre) 2015]


14. Photosynthesis occurs in –

(a) Night
(b) Day and night
(c) Day or night
(d) Only day

[43rd B.P.S.C. (Pre) 1999]


15. The process by which plants produce food is called

(a) Carbohydrolysis
(b) Metabolic synthesis
(c) Photosensitization
(d) Photosynthesis

[44th B.P.S.C. (Pre) 2000]


16. The process by which plants synthesize their food is called

(a) Osmosis
(b) Respiration
(c) Photosynthesis
(d) Plasmolysis

[U.P.R.O./A.R.O. (Mains) 2013]


17. Photosynthesis occurs in-

(a) Nucleus
(b) Mitochondria
(c) Chloroplast
(d) Peroxisome

[53rd to 55th B.P.S.C. (Pre) 2011]


18. Which of the following types of light are strongly absorbed by plants?

(a) Violet and orange
(b) Blue and red
(c) Indigo and yellow
(d) Yellow and violet

[I.A.S. (Pre) 2007]


19. The most active light for photosynthesis is :

(a) Violet light
(b) Red light
(c) Blue light
(d) Green light

[Uttrakhand U.D.A./L.D.A. (Mains) 2006]


20. Which light is most effective in photosynthesis?

(a) Red
(b) Blue
(c) Green
(d) Violet

[U.P. R.O./A.R.O. (Mains) 2014]


21. What rays of sunlight are mostly utilized by chlorophyll in photosynthesis ?

(a) Red
(b) Yellow
(c) Green
(d) Blue

[Uttarakhand P.C.S. (Pre) 2010]


22. Artificial light can –

(a) Destroy chlorophyll
(b) Synthesise chlorophyll
(c) Bring about photosynthesis
(d) Not bring about photosynthesis

[U.P. Lower (Spl) (Pre) 2008]


23. Which one of the following energy conversions takes place in carrying out the process of photosynthesis ?

(a) Light to chemical energy
(b) Light to thermal energy
(c) Thermal to biochemical energy
(d) Heat to kinetic energy

[U.P.P.C.S. (Pre) 1998]


24. In the process of Photosynthesis, how many molecules of A.T.P. are involved in the synthesis of each molecule of Glucose?

(a) 16
(b) 18
(c) 20
(d) 24

[Chhattisgarh P.C.S. (Pre) 2020]


25. Solar energy is converted into ATP in :

(a) mitochondria
(b) chloroplast
(c) ribosome
(d) peroxisome
(e) None of the above/More than one of the above

[65th B.P.S.C. (Pre) 2019]


26. Light energy changes into the chemical energy by which of the following process :

(a) Electrolysis
(b) By photosynthesis
(c) By respiration
(d) By spewing

[Uttarakhand P.C.S. (Pre) 2007]


27. The sunlight energy used by green plants in photosynthesis is transformed into :

(a) chemical energy
(b) physical energy
(c) both (a) or (b)
(d) None of the above

[M.P. P.C.S. (Pre) 2018]


28. In photosynthesis

(a) Solar energy converts into heat energy
(b) Solar energy converts into kinetic energy
(c) Solar energy converts into potential energy
(d) Light energy converts into mechanical energy
(e) None of the above

[Chhattisgarh P.C.S. (Pre) 2017]


29. Which one of the following is the process involved in photosynthesis?

(a) Potential energy is released to form free energy
(b) Free energy is converted into potential energy and stored
(c) Food is oxidized to release carbon dioxide and water
(d) Oxygen is taken, and carbon dioxide and water vapour are given out

[I.A.S. (Pre) 2014]


30. Which of the following has the maximum efficiency to convert solar energy into chemical energy ?

(a) Chlorella
(b) Tiger
(c) Earthworm
(d) Cuscutta

[U.P.P.S.C. (R.I.) 2014]


31. Which of the following is not the work of roots?

(a) Photosynthesis
(b) Water absorption
(c) Absorption nutrients
(d) To help the plants

[Uttarakhand P.C.S. (Mains) 2006]


32. Which one of the following does not increase the amount of carbon dioxide in carbon cycle on earth ?

(a) Respiration
(b) Photosynthesis
(c) Decay of organic matter
(d) Volcanic action

[U.P.P.C.S. (Mains) 2012]

33. It is harmful to sleep under a tree at night because the tree releases :

(a) Oxygen
(b) Carbon dioxide
(c) Carbon monoxide
(d) Sulphur dioxide

[M.P.P.C.S. (Pre) 2000]


34. Photosynthesis using the invisible part of the sunlight is done by some –

(a) Trees
(b) Algae
(c) Bacteria
(d) Fungi

[U.P.P.C.S.(Pre) 2013]