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Photosynthesis in Higher Plants MCQ. We covered all the Photosynthesis in Higher Plants MCQ in this post for free so that you can practice well for the exam.
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MCQ on Photosynthesis in Higher Plants for Students
To generate three glucose molecules, how many carbon dioxide molecules must be fixed and how many cycles of Calvin cycle are needed?
(a) 18; 6
(b) 6; 6
(c) 12; 3
(d) 18; 18
Option d – 18; 18
How many complete turns of the Calvin cycle are required to synthesize five glucose molecules?
(a) 12 cycles
(b) 52 cycles
(c) 6 cycles
(d) 30 cycles
Option d – 30 cycles
Which step in the Calvin cycle is facilitated by the enzyme RuBisCO?
(a) Conversion of 3-phosphoglycerate to triose phosphate
(b) Transformation of RuBP to 3-phosphoglycerate
(c) Change from phosphoenol pyruvate to oxaloacetic acid
(d) Conversion of oxaloacetate to malate
Option b – Transformation of RuBP to 3-phosphoglycerate
In which plant among the following is photorespiration absent?
(a) Hibiscus
(b) Maize
(c) Banyan
(d) Potato (Solanum tuberosum)
Option b – Maize
During the Calvin cycle’s reduction stage, NADPH+H is utilized to reduce which compound?
(a) RuBP
(b) Triose phosphate
(c) 3-phosphoglycerate
(d) Starch
Option c – 3-phosphoglycerate
What does an absorption spectrum represent?
(a) Graph showing wavelengths absorbed by the main pigment
(b) Graph displaying wavelengths reflected by pigments
(c) Graph showing absorption by chlorophyll a, b, and carotenoids
(d) Graph illustrating reflection by accessory pigments
Option c – Graph showing absorption by chlorophyll a, b, and carotenoids
Which of the following is not a product of the light-dependent reactions of photosynthesis?
(a) ATP
(b) Oxygen
(c) NADPH
(d) RuBP
Option d – RuBP
Choose the correct statements regarding Calvin cycle:
ii. It relies on the outputs of light reactions
iii. The process takes place in the chloroplast stroma
(a) i and iv
(b) ii and iii
(c) iii and iv
(d) i, ii and iv
Option b – ii and iii
Identify the incorrect statement regarding Maize and Sorghum:
(a) They possess bundle sheath cells
(b) These plants fix CO₂ via the Hatch-Slack pathway
(c) Calvin cycle is not present in these species
(d) Kranz anatomy is seen in these plants
Option c – Calvin cycle is not present in these species
All of these are correct regarding bundle sheath cells, except:
(a) They are large cells surrounding vascular bundles in C4 plants
(b) These cells contain the enzyme PEP carboxylase
(c) The C3 pathway occurs here in C4 plants
(d) These cells are rich in chloroplasts
Option b – These cells contain the enzyme PEP carboxylase
With reference to photorespiration in C3 plants, identify the incorrect statements:
ii. Only 2 ATP are produced instead of 3
iv. Photorespiration leads to glucose formation
(a) ii and iv
(b) i, ii and iv
(c) iii and iv
(d) i and iii
Option a – ii and iv
Which statement is false concerning C4 plants?
(a) The initial stable product contains five carbon atoms
(b) They are suited to arid tropical regions
(c) Their leaves exhibit Kranz anatomy
(d) Bundle sheath cells are present in them
Option a – The initial stable product contains five carbon atoms
Why is photorespiration regarded as a wasteful process?
(a) ATP and NADPH are not synthesized
(b) It doesn’t result in sugar production
(c) It counteracts photosynthesis
(d) All of the above
Option d – All of the above
In green plants, what is the source of oxygen released during photosynthesis?
(a) Water
(b) NADPH
(c) Carbohydrates
(d) Atmospheric carbon dioxide
Option a – Water
Which statement about the Hatch-Slack pathway is incorrect?
(a) PEP serves as the initial CO₂ acceptor
(b) The C3 cycle happens in mesophyll cells
(c) CO₂ is fixed in two phases
(d) The C4 acid generated in mesophyll is sent to bundle sheath cells
Option b – The C3 cycle happens in mesophyll cells
Which process does not occur during the carboxylation stage of the Calvin cycle?
(a) RuBP reacts with CO₂
(b) RuBP carboxylase catalyzes the process
(c) Two molecules of 3-PGA are produced
(d) 3-PGA undergoes phosphorylation and reduction
Option d – 3-PGA undergoes phosphorylation and reduction
What takes place during the dark reaction phase of photosynthesis?
(a) Glucose is broken down to CO₂
(b) Water is split to generate O₂
(c) ATP and NADPH are formed
(d) Carbon dioxide is fixed into sugars
Option d – Carbon dioxide is fixed into sugars
In cyclic photophosphorylation, when is the excited electron redirected to Photosystem I?
(a) When water is split
(b) Upon oxygen release
(c) When NADP is unavailable
(d) After NADPH is produced
Option c – When NADP is unavailable
Why is chlorophyll a called the primary pigment?
(a) It alone can absorb and convert solar energy to chemical energy
(b) It forms the photosystem reaction center
(c) It is vital for both cyclic and non-cyclic photophosphorylation
(d) All of the above
Option d – All of the above
Which statement correctly explains photophosphorylation?
(a) ATP is broken down into ADP
(b) Water is split to release oxygen
(c) Chemical energy is stored in organic molecules
(d) ATP synthesis occurs in the presence of light and chlorophyll
Option d – ATP synthesis occurs in the presence of light and chlorophyll
Review the following:
Statement I: ATP generation in chloroplasts and mitochondria follows the chemiosmotic model involving proton gradients
Statement II: NADP reductase catalyzes ATP synthesis via chemiosmosis
Which statement is incorrect?
(a) Statement I
(b) Statement II
(c) Both are incorrect
(d) Both are correct
Option b – Statement II
As per the chemiosmotic hypothesis, where is the primary electron acceptor found?
(a) On the outer surface of the thylakoid membrane
(b) It donates electrons to another carrier
(c) Located on the inner membrane surface
(d) Found within the thylakoid lumen
Option a – On the outer surface of the thylakoid membrane
Which statement is true regarding the dark phase of photosynthesis?
(a) It is a light-dependent reaction
(b) It involves photophosphorylation
(c) Requires products from the light reactions
(d) Produces ATP, NADPH₂, O₂, and H₂O as final products
Option c – Requires products from the light reactions
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