Biology Objective Questions and Answers: Photosynthesis In Higher Plants
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Multiple Choice Questions
(a) Joining of three carbon atoms to from glucose
(b) Formation of ATP
(c) Ionization of water
(d) Excitement of an electron of chlorophyll by a photon of light.
Show Answer & Explanation
Answer: (d) Excitement of an electron of chlorophyll by a photon of light.
Explanation:
1. The first step of the light reaction is absorption of a photon that excites an electron of chlorophyll.
2. All later events depend on this excitation.
Teacher's Note:
1. Photosynthesis questions follow a fixed chain: light reaction in thylakoids, dark reaction in stroma.
2. Link each fact to its site, its enzyme or its scientist to remember it.
(a) ATP & NADPH(H⁺)
(b) NADPH(H⁺) & glucose
(c) Only ATP
(d) O₂ & glucose
Show Answer & Explanation
Answer: (a) ATP & NADPH(H⁺)
Explanation:
1. The light reaction yields ATP and NADPH.
2. O2 is a by-product and glucose forms later in the dark reaction.
Teacher's Note:
1. Photosynthesis questions follow a fixed chain: light reaction in thylakoids, dark reaction in stroma.
2. Link each fact to its site, its enzyme or its scientist to remember it.
(a) DPN
(b) DNA
(c) ATP
(d) NADP
Show Answer & Explanation
Answer: (d) NADP
Explanation:
1. NADP picks up hydrogen (as NADPH) in the light reaction.
2. It carries the hydrogen to the Calvin cycle.
Teacher's Note:
1. Photosynthesis questions follow a fixed chain: light reaction in thylakoids, dark reaction in stroma.
2. Link each fact to its site, its enzyme or its scientist to remember it.
(a) liberation of O₂ takes place
(b) Formation of ATP and NADPH₂ take place
(c) Liberation of O₂, formation of ATP, and NADPH₂ takes place
(d) Assimilation of CO₂ takes place
Show Answer & Explanation
Answer: (c) Liberation of O₂, formation of ATP, and NADPH₂ takes place
Explanation:
1. The photochemical phase releases O2 and forms ATP and NADPH.
2. CO2 assimilation is the dark phase.
Teacher's Note:
1. Photosynthesis questions follow a fixed chain: light reaction in thylakoids, dark reaction in stroma.
2. Link each fact to its site, its enzyme or its scientist to remember it.
(a) Phosphorylation
(b) Oxidative phosphorylation
(c) Photophosphorylation
(d) Photolysis
Show Answer & Explanation
Answer: (c) Photophosphorylation
Explanation:
1. Light driven formation of ATP in grana is photophosphorylation.
2. Oxidative phosphorylation takes place in mitochondria.
Teacher's Note:
1. Photosynthesis questions follow a fixed chain: light reaction in thylakoids, dark reaction in stroma.
2. Link each fact to its site, its enzyme or its scientist to remember it.
(a) Real power
(b) Oxidising agent
(c) Power house of energy
(d) Reducing power
Show Answer & Explanation
Answer: (d) Reducing power
Explanation:
1. NADPH supplies hydrogen and electrons for reducing CO2.
2. It is therefore called reducing power.
Teacher's Note:
1. Photosynthesis questions follow a fixed chain: light reaction in thylakoids, dark reaction in stroma.
2. Link each fact to its site, its enzyme or its scientist to remember it.
(a) Chlorophyll
(b) NADP
(c) OH⁻
(d) Cytochrome
Show Answer & Explanation
Answer: (a) Chlorophyll
Explanation:
1. The electron from water is first taken up by the oxidised chlorophyll (P680 plus).
2. This restores the reaction centre.
Teacher's Note:
1. Photosynthesis questions follow a fixed chain: light reaction in thylakoids, dark reaction in stroma.
2. Link each fact to its site, its enzyme or its scientist to remember it.
(a) NADP & ATP
(b) ATP
(c) NADH⁺ H⁺ and O₂
(d) NADPH⁺ H⁺, ATP and O₂
Show Answer & Explanation
Answer: (b) ATP
Explanation:
1. In cyclic photophosphorylation only ATP is formed.
2. There is no NADPH and no O2 because water is not split and electrons return to P700.
Teacher's Note:
1. Photosynthesis questions follow a fixed chain: light reaction in thylakoids, dark reaction in stroma.
2. Link each fact to its site, its enzyme or its scientist to remember it.
(a) Cytochrome b6
(b) Pigment system - I
(c) Pigment system - II
(d) Plastocyanin
Show Answer & Explanation
Answer: (c) Pigment system - II
Explanation:
1. Photooxidation of water is linked to PS II.
2. The oxygen evolving complex is on the lumen side of PS II.
Teacher's Note:
1. Photosynthesis questions follow a fixed chain: light reaction in thylakoids, dark reaction in stroma.
2. Link each fact to its site, its enzyme or its scientist to remember it.
(a) CO₂
(b) NADP
(c) H₂O
(d) PGA
Show Answer & Explanation
Answer: (c) H₂O
Explanation:
1. Water is oxidised to O2 and the electrons and protons reduce NADP and CO2.
2. CO2 and NADP are reduced.
Teacher's Note:
1. Photosynthesis questions follow a fixed chain: light reaction in thylakoids, dark reaction in stroma.
2. Link each fact to its site, its enzyme or its scientist to remember it.
(a) Mn²⁺
(b) Cl⁻
(c) Ca²⁺
(d) All
Show Answer & Explanation
Answer: (d) All
Explanation:
1. The oxygen evolving complex contains manganese, calcium and chloride ions.
2. So all the three are present.
Teacher's Note:
1. Photosynthesis questions follow a fixed chain: light reaction in thylakoids, dark reaction in stroma.
2. Link each fact to its site, its enzyme or its scientist to remember it.
(a) Ferredoxin
(b) Plastocyanin
(c) Plastoquinone
(d) Cytochrome
Show Answer & Explanation
Answer: (b) Plastocyanin
Explanation:
1. Plastocyanin is a copper containing protein that passes electrons to PS I.
2. Ferredoxin is an iron-sulphur protein.
Teacher's Note:
1. Photosynthesis questions follow a fixed chain: light reaction in thylakoids, dark reaction in stroma.
2. Link each fact to its site, its enzyme or its scientist to remember it.
(a) Cytochrome
(b) Cu protein/Plastocyanin
(c) FeS protein/Ferredoxin
(d) Fe-Mg protein
Show Answer & Explanation
Answer: (c) FeS protein/Ferredoxin
Explanation:
1. The first carrier accepting an electron from P700 is the FeS protein (ferredoxin).
2. The electron then goes to NADP.
Teacher's Note:
1. Photosynthesis questions follow a fixed chain: light reaction in thylakoids, dark reaction in stroma.
2. Link each fact to its site, its enzyme or its scientist to remember it.
(a) Grana
(b) Stroma
(c) Matrix
(d) Oxysomes
Show Answer & Explanation
Answer: (a) Grana
Explanation:
1. PS II lies mostly in the grana thylakoids.
2. The stroma and matrix are for dark reactions and mitochondria.
Teacher's Note:
1. Photosynthesis questions follow a fixed chain: light reaction in thylakoids, dark reaction in stroma.
2. Link each fact to its site, its enzyme or its scientist to remember it.
(a) Water is reduced & CO₂ is oxidized
(b) CO₂ is reduced & water is oxidized
(c) Both CO₂ & water get reduced
(d) Both CO₂ & water get oxidized
Show Answer & Explanation
Answer: (b) CO₂ is reduced & water is oxidized
Explanation:
1. Water is oxidised to O2 while CO2 is reduced to sugar.
2. Both processes happen in different phases of photosynthesis.
Teacher's Note:
1. Photosynthesis questions follow a fixed chain: light reaction in thylakoids, dark reaction in stroma.
2. Link each fact to its site, its enzyme or its scientist to remember it.
(a) High altitude plants
(b) Total darkness
(c) Presence of ferricyanide
(d) Absence of water DARK REACTIONS (C₃–PLANTS,
Show Answer & Explanation
Answer: (c) Presence of ferricyanide
Explanation:
1. The Hill reaction uses an artificial electron acceptor such as ferricyanide.
2. Isolated chloroplasts in light then release oxygen without CO2.
Teacher's Note:
1. Photosynthesis questions follow a fixed chain: light reaction in thylakoids, dark reaction in stroma.
2. Link each fact to its site, its enzyme or its scientist to remember it.
(a) Water splits
(b) CO₂ is reduced to organic compounds
(c) Chlorophyll is activated
(d) Stable C6-sugar is broken into three carbon sugars
Show Answer & Explanation
Answer: (b) CO₂ is reduced to organic compounds
Explanation:
1. The dark reaction reduces CO2 to sugars.
2. Water splitting and chlorophyll activation belong to the light reaction.
Teacher's Note:
1. Photosynthesis questions follow a fixed chain: light reaction in thylakoids, dark reaction in stroma.
2. Link each fact to its site, its enzyme or its scientist to remember it.
(a) all bacteria, fungi and algae
(b) fungi, algae and green plant cells
(c) some bacteria, algae and green plants cells
(d) viruses, fungi and bacteria
Show Answer & Explanation
Answer: (c) some bacteria, algae and green plants cells
Explanation:
1. Carbohydrates are made by some bacteria, algae and green plant cells.
2. Fungi and viruses are not photosynthetic.
Teacher's Note:
1. Photosynthesis questions follow a fixed chain: light reaction in thylakoids, dark reaction in stroma.
2. Link each fact to its site, its enzyme or its scientist to remember it.
(a) PEP carboxylase
(b) Hexokinase
(c) RUBP oxygenase
(d) Hydrogenase
Show Answer & Explanation
Answer: (a) PEP carboxylase
Explanation:
1. PEP carboxylase fixes atmospheric CO2 in the C4 pathway.
2. It combines CO2 with phosphoenolpyruvate in mesophyll cells.
Teacher's Note:
1. Photosynthesis questions follow a fixed chain: light reaction in thylakoids, dark reaction in stroma.
2. Link each fact to its site, its enzyme or its scientist to remember it.
(a) Oxidation
(b) Reduction
(c) Electrolysis
(d) Hydrolysis
Show Answer & Explanation
Answer: (b) Reduction
Explanation:
1. PGA is reduced to phosphoglyceraldehyde by NADPH.
2. ATP is also used.
Teacher's Note:
1. Photosynthesis questions follow a fixed chain: light reaction in thylakoids, dark reaction in stroma.
2. Link each fact to its site, its enzyme or its scientist to remember it.
(a) Calvin cycle
(b) Hatch - Slack cycle
(c) Cyclic photophosphorylation
(d) TCA Cycle
Show Answer & Explanation
Answer: (b) Hatch - Slack cycle
Explanation:
1. Sugarcane is a C4 plant and uses the Hatch and Slack cycle.
2. This gives it high CO2 fixation efficiency in warm climates.
Teacher's Note:
1. Photosynthesis questions follow a fixed chain: light reaction in thylakoids, dark reaction in stroma.
2. Link each fact to its site, its enzyme or its scientist to remember it.
(a) C₄ plant
(b) C₃ plant
(c) Succulent plants
(d) None of the above
Show Answer & Explanation
Answer: (a) C₄ plant
Explanation:
1. Kranz anatomy, a wreath of bundle sheath cells, is the feature of C4 plants.
2. C3 plants lack it.
Teacher's Note:
1. Photosynthesis questions follow a fixed chain: light reaction in thylakoids, dark reaction in stroma.
2. Link each fact to its site, its enzyme or its scientist to remember it.
(a) Only gramineae
(b) Only monocot
(c) Only dicot
(d) Monocots as well as dicots
Show Answer & Explanation
Answer: (d) Monocots as well as dicots
Explanation:
1. C4 plants occur among both monocots and dicots.
2. Maize and sugarcane are monocots, Atriplex is a dicot.
Teacher's Note:
1. Photosynthesis questions follow a fixed chain: light reaction in thylakoids, dark reaction in stroma.
2. Link each fact to its site, its enzyme or its scientist to remember it.
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FAQs
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