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Photosynthesis MCQs | Photosynthesis Multiple Choice Questions with Answers

Free download in PDF Photosynthesis Multiple Choice Questions(MCQs) & Answers. These multiple choice questions on Photosynthesis are very useful for SSC, UGC NET, NEET etc.
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(1) Photorespiration, usually occurs in
[A] One cell organelle
[B] Two cell organelles
[C] Three cell organelles
[D] Four cell organelles
Answer: Three cell organelles
(2) Stomata opens
[A] In day time - for gaseous exchange
[B] In day time - no gaseous exchange
[C] In night time only - for gaseous exchange
[D] In night time only - no gaseous exchange
Answer: In day time - for gaseous exchange
(3) Which of the following statements about phytochrome is true?
[A] Pr absorbs yellow light and becomes Pfr
[B] Pfr absorbs red light and becomes Pr
[C] Pfr absorbs yellow light and becomes Pr
[D] Pr absorbs red light and becomes Pfr
Answer: Pr absorbs red light and becomes Pfr
(4) Blackman's law is related to
[A] Respiration
[B] Transpiration
[C] Photosynthesis
[D] Root pressure
Answer: Photosynthesis
(5) Photosynthetic bacteria do not contain
[A] Quantasome
[B] PS-I and PS-II
[C] PS-II
[D] PS-I
Answer: Quantasome
(6) The photorespiratory carbon-oxidation cycle involves the interaction of
[A] Chloroplast
[B] Mitochordria
[C] Peroxisomes
[D] All of these
Answer: All of these
(7) Hill reaction occurs in:
[A] High altitude plants
[B] Total darkness
[C] Absence of water
[D] Presence of ferricyanide
Answer: Presence of ferricyanide
(8) Cyclic photophosphorylation invloves
[A] PS I
[B] PS II
[C] PS I and PS II
[D] P680
Answer: PS I
(9) The first stable product of Clavin cycle is
[A] 3-phosphoglycerate
[B] 1, 3 biphosphoglycerate
[C] Ribulose - 5- phosphate
[D] Glyceraldehyde - 3 phosphate
Answer: 3-phosphoglycerate
(10) PS-II occurs only in
[A] Stroma
[B] Granal thylakoids
[C] Stromal lamella
[D] Matrix
Answer: Granal thylakoids
(11) Which of the following statements is correct?
[A] Photorespiration is useful process.
[B] C4 plants are more efficient than C3 plants.
[C] C4 plants are less efficient than C3 plants.
[D] Photorespiration is absent in C3 plants but present in C4 plants
Answer: C4 plants are more efficient than C3 plants.
(12) Photorespiration shows formation of
[A] Sugar but not ATP
[B] ATP but not sugar
[C] Both ATP and sugar
[D] Neither ATP nor sugar.
Answer: Neither ATP nor sugar.
(13) Kranz anatomy is usually associated with
[A] C3 plants
[B] C4 plants
[C] CAM plants
[D] Enterogasterone, gastrin, pancreozymin and cholecystokinin
Answer: C4 plants
(14) C4 plants have better productivity because
[A] C4 plants absorb more light
[B] C4 plants absorb more CO2
[C] C4 plants have more amount of RuBisCO
[D] C4 plants does not carry photorespiration
Answer: C4 plants does not carry photorespiration
(15) The first carbon dioxide fixation product of C4 plant is
[A] Oxaloacetic acid
[B] ribulose biphosphate
[C] phosphoenol pyruvate
[D] phosphoglyceric acid
Answer: Oxaloacetic acid
(16) Carbon dioxide is necessary for photosynthesis. The chemical used to remove this gas most effectively from entering a control apparatus is
[A] Calcium oxide
[B] Distilled water
[C] Potassium hydroxide solution
[D] Sodium carbonate
Answer: Potassium hydroxide solution
(17) Photosynthesis in C4 plants is relatively less limited by atmospheric CO2 levels because
[A] There is effective pumping of CO2 into bundle sheath cells
[B] RuBisCO in C4 plants has higher affinity for CO2
[C] The primary fixation of CO2 is mediated via PEP carboxylase
[D] Six carbon acids are the primary initial CO2 fixation products
Answer: The primary fixation of CO2 is mediated via PEP carboxylase
(18) The chemiosmotic coupling hypotheisis of oxidative phosphorylation proposes that adenosine triphosphate (ATP) is formed because
[A] ADP is pumped out of the matrix into the intermembrane space
[B] High energy bonds are formed in mitochondrial proteins
[C] There is a change in the permeability of the inner mitochondrial membrane towards adenosine diphosphate (ADP)
[D] A proton gradient forms across the inner mitochondrial membrane
Answer: A proton gradient forms across the inner mitochondrial membrane
(19) Which of the following is incorect about the light reactions of photosynthesis?
[A] P680 and P700 are the reaction centres of PS-I, and PS-II respectively
[B] Light energy provides energy for the photolysis of water through excitation of the reaction centre of PS-II
[C] NADPH is not produced in cyclic electrons transport in light reactions
[D] Reactions of the two photosystems are needed for the reduction of NADP
Answer: P680 and P700 are the reaction centres of PS-I, and PS-II respectively
(20) In blue-green algae, photosystem- II contains important pigment concerned with photolysis of water. It is a
[A] Phycocyanin
[B] Cytochrome-c
[C] Chlorophyll -b
[D] β-carotene
Answer: Phycocyanin
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