CBSE Class 11 Biology Photosynthesis in Higher Plants MCQs Set 04

Question: Which fractions of the visible spectrum of solar radiations are primarily absorbed by carotenoids of the higher plants?
a) Blue and green
b) Green and red
c) Red and violet
d) Violet and blue
Answer: d

Question: Which element is located at the centre of the porphyrin ring in chlorophyll ?
a) Calcium
b) Magnesium
c) Potassium
d) Manganese
Answer: b

Question: Stroma in the chloroplasts of higher plant contains
a) light-dependent reaction enzymes
b) ribosomes
c) chlorophyll
d) light-independent reaction enzymes.
Answer: d

Question: Chlorophyll a occurs in
a) all photosynthetic autotrophs
b) in all higher plants
c) all oxygen liberating autotrophs
d) all plants except fungi.
Answer: c

Question: In a chloroplast the highest number of protons are found in
a) intermembrane space
b) antennae complex
c) stroma
d) lumen of thylakoids.
Answer: d

Question: Chlorophyll a molecule at its carbon atom 3 of the pyrrole ring II has one of the following
a) carboxylic group
b) magnesium
c) aldehyde group
d) methyl group.
Answer: d

Question: Which of the following is not a product of light reaction of photosynthesis?
a) ATP
b) NADH
c) NADPH
d) Oxygen
Answer: b

Question: Chromatophores take part in
a) movement
b) respiration
c) photosynthesis
d) growth.
Answer: c

Question: The core metal of chlorophyll is
a) Ni
b) Cu
c) Fe
d) Mg.
Answer: d

Question: Cyclic photophosphorylation results in the formation of
a) ATP and NADPH
b) ATP, NADPH and O2
c) ATP
d) NADPH.
Answer: c

Question: Which technique has helped in investigation of Calvin cycle?
a) X-ray crystallography
b) X-ray technique
c) Radioactive isotope technique
d) Intermittent light
Answer: c

Question: Which of the following absorb light energy for photosynthesis?
a) Chlorophyll
b) Water molecule
c) O2
d) RuBP
Answer: a

Question: Oxygen is not produced during photosynthesis by
a) Green sulphur bacteria
b) Nostoc
c) Cycas
d) Chara.
Answer: a

Question: Electrons from excited chlorophyll molecule of photosystem II are accepted first by
a) quinone
b) ferredoxin
c) cytochrome-b
d) cytochrome-f.
Answer: a

Question: Photosynthetic pigments found in the chloroplasts occur in
a) thylakoid membranes
b) plastoglobules
c) matrix
d) chloroplast envelope.
Answer: a

Question: The carbon dioxide acceptor in Calvin cycle/ C3-plants is
a) phosphoenol pyruvate (PEP)
b) ribulose 1, 5-diphosphate (RuDP)
c) phosphoglyceric acid (PGA)
d) ribulose monophosphate (RMP).
Answer: b

Question: Which of the following pigments acts as a reactioncentre during photosynthesis?
a) Carotene
b) Phytochrome
c) P700
d) Cytochrome
Answer: c

Question: The first step for initiation of photosynthesis will be
a) photolysis of water
b) excitement of chlorophyll molecules due to absorption of light
c) ATP formation
d) glucose formation.
Answer: b

Question: One scientist cultured Cladophora in a suspension of Azotobacter and illuminated the culture by splitting light through a prism. He observed that bacteria accumulated mainly in the egion of
a) violet and green light
b) indigo and green light
c) orange and yellow light
d) blue and red light.
Answer: d

Question: Ferredoxin is a constituent of
a) PS I
b) PS II
c) Hill reaction
d) P680.
Answer: a

Question: The size of chlorophyll molecule is
a) head 15 × 15 Å, tail 25 Å
b) head 20 × 20 Å, tail 25 Å
c) head 15 × 15 Å, tail 20 Å
d) head 10 × 12 Å, tail 25 Å.
Answer: c

Question: For the synthesis of one glucose molecule the Calvin cycle operates for
a) 2 times
b) 4 times
c) 6 times
d) 8 times.
Answer: c

Question: PGA as the first CO₂ fixation product was discovered in photosynthesis of
a) bryophyte
b) gymnosperm
c) angiosperm
d) alga.
Answer: d

Question: The chemiosmotic coupling hypothesis of oxidative phosphorylation proposes that adenosine triphosphate (ATP) is formed because
a) a proton gradient forms across the inner membrane
b) there is a change in the permeability of the inner mitochondrial membrane toward adenosine diphosphate (ADP)
c) high energy bonds are formed in mitochondrial proteins
d) ADP is pumped out of the matrix into the intermembrane space.
Answer: a

Question: The primary acceptor, during CO2 fixation in C3 plants, is
a) phosphoenolpyruvate (PEP)
b) ribulose 1, 5-diphosphate (RuDP)
c) phosphoglyceric acid (PGA)
d) ribulose monophosphate (RMP).
Answer: b

Question: In photosynthesis, the light-independent reactions take place at
a) photosystem II
b) stromal matrix
c) thylakoid lumen
d) photosystem I.
Answer: b

Question: Which one of the following is essential for photolysis of water?
a) Manganese
b) Zinc
c) Copper
d) Boron
Answer: a

Question: Emerson’s enhancement effect and Red drop have been instrumental in the discovery of
a) photophosphorylation and cyclic electron transport
b) oxidative phosphorylation
c) photophosphorylation and non-cyclic electron transport
d) two photosystems operating simultaneously.
Answer: d

Question: Oxygenic photosynthesis occurs in
a) Oscillatoria
b) Rhodospirillum
c) Chlorobium
d) Chromatium.
Answer: a

Question: Which pigment system is inactivated in red drop?
a) PS-I and PS-II
b) PS-I
c) PS-II
d) None of these
Answer: c

Question: Which one of the following concerns photophosphorylation ?
a) ADP + AMP→ Light energy ATP
b) ADP + Inorganic PO4→ Light energy ATP
c) ADP + Inorganic PO4→ ATP
d) AMP + Inorganic PO4→ Light energy ATP
Answer: b

Question: In photosynthesis energy from light reaction to dark reaction is transferred in the form of
a) ADP
b) ATP
c) RuDP
d) chlorophyll
Answer: b

Question: Read the following four statements (A – D). a) Both photophosphorylation and oxidative phosphorylation involve uphill transport of protons across the membrane. b) In dicot tems, a new cambium originates from cells of pericycle at the time of secondary growth. c) Stamens in flowers of Gloriosa and Petunia are polyandrous.d) Symbiotic nitrogen fixers ccur in free-living state also in soil. How many of the above statements are right?
a) Two
b) Three
c) Four
d) One
Answer: a

Question: During light reaction of photosynthesis, which of the following phenomenon is observed during cyclic phosphorylation as well as non-cyclic phosphorylation?
a) Release of O2
b) Formation of ATP
c) Formation of NADPH
d) Involvement of PS I and PS II pigment systems
Answer: b

Question: Anoxygenic photosynthesis is characteristic of
a) Rhodospirillum
b) Spirogyra
c) Chlamydomonas
d) Ulva.
Answer: a

Question: Which one of the following organisms is correctly matched with its three characteristics?
a) Pea: C3 pathway, endospermic seed, vexillary aestivation
b) Tomato: twisted aestivation, axile placentation, berry
c) Onion: bulb, imbricate aestivation, axile placentation
d) Maize: C3 pathway, closed vascular bundles, scutellum
Answer: c

Question: What will be the number of Calvin cycles to generate one molecule of hexose?
a) 8
b) 9
c) 4
d) 6
Answer: d

Question: For assimilation of one CO2 molecule, the energy required in form of ATP and NADPH2 are
a) 2 ATP and 2 NADPH2
b) 5 ATP and 3 NADPH2
c) 3 ATP and 2NADPH2
d) 18 ATP and 12 NADPH2.
Answer: c

Question: NADP+ is reduced to NADPH in
a) PS I
b) PS II
c) Calvin cycle
d) noncyclic photophosphorylation.
Answer: d

Question: Photosystem II occurs in
a) stroma
b) cytochrome
c) grana
d) mitochondrial surface.
Answer: c

Question: Carbon dioxide acceptor in C3-plants is
a) PGA
b) PEP
c) RuDP
d) none of these.
Answer: c

Question: In light reaction, plastoquinone facilitates the transfer of electrons from
a) PS-II to Cytb6f complex
b) Cytb6f complex to PS-I
c) PS-I to NADP+
d) PS-I to ATP synthase.
Answer: a

Question: Chemiosmotic theory of ATP synthesis in the chloroplasts and mitochondria is based on
a) membrane potential
b) accumulation of Na+ ions
c) accumulation of K+ ions
d) proton gradient.
Answer: d

Question: A photosynthesising plant is releasing 18O more than the normal. The plant must have been supplied with
a) O3
b) H2O with18O
c) CO2 with18O
d) C6H12O6 with18O.
Answer: b

Question: In C3 plants, the first stable product of photosynthesis during the dark reaction is
a) malic acid
b) oxaloacetic acid
c) 3-phosphoglyceric acid
d) phosphoglyceraldehyde.
Answer: c

Question: The first acceptor of electrons from an excited chlorophyll molecule of photosystem II is
a) iron-sulphur protein
b) ferredoxin
c) quinone
d) cytochrome.
Answer: c

Question: In photosystem I, the first electron acceptor is
a) an iron-sulphur protein
b) ferredoxin
c) cytochrome
d) plastocyanin.
Answer: a

Question: The mechanism of ATP formation both in chloroplast and mitochondria is explained by
a) chemiosmotic theory
b) Munch’s hypothesis (mass flow model)
c) relay pump theory of Godlewski
d) Cholodny-Wont’s model.
Answer: a

Question: NADPH2 is generated through
a) photosystem II
b) anaerobic respiration
c) glycolysis
d) photosystem I.
Answer: d

Question: Read the following four statements, (i), (ii), (iii) and (iv) and select the right option having both correct statements. Statements : (i) Z scheme of light reaction takes place in presence of PSI only. (ii) Only PSI is functional in cyclic photophosphorylation. (iii) Cyclic photophosphorylation results into synthesis of ATP and NADPH2. (iv) Stroma lamellae lack PSII s well as NADP.
a) (ii) and (iv)
b) (i) and (ii)
c) (ii) and (iii)
d) (iii) and (iv)
Answer: a