NEET BIOLOGY 60 MCQS QUIZ 28 AUGUST

Photosynthesis in Higher Plants

4 Free Chapter-Wise Tests • 15 MCQs in each test • 60 questions total

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FREE TEST 1

Test 1 — Photosynthesis in Higher Plants

15 MCQs • Submit to view correct answers • 1 mark each

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1. Where do the dark reactions of photosynthesis take place?

Thylakoid lumen Stroma Grana only Stromal lamellae

2. For fixation of one CO₂ molecule through the Calvin cycle, how many ATP and NADPH molecules are required?

3 ATP and 2 NADPH 5 ATP and 2 NADPH 12 ATP and 12 NADPH 2 ATP and 3 NADPH

3. Which technique is used to separate photosynthetic pigments such as chlorophyll a, chlorophyll b, xanthophyll and carotene?

Paper chromatography Gel electrophoresis ELISA X-ray diffraction

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4. Pigment-containing membranous extensions in some cyanobacteria are called:

Basal bodies Pneumatophores Chromatophores Heterocysts

5. Oxygenic photosynthesis occurs in:

Oscillatoria Rhodospirillum Chlorobium Chromatium

6. Bundle sheath chloroplasts of C₄ plants are generally:

Large and agranal Large and granal Small and agranal Small and granal

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7. The substrate for photorespiration is:

RuBP Glycolate Serine Glycine

8. Which crop is described as a very efficient converter of solar energy with high net productivity?

Wheat Sugarcane Rice Bajra

9. The dark reactions of photosynthesis occur in the:

Granal thylakoid membranes Stromal lamella membranes Stroma Thylakoid lumen

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10. Which element helps in electron transport during photosynthesis?

Zinc Molybdenum Boron Manganese

11. How many ATP and NADPH molecules are produced during photorespiration?

2 and 4 1 and 2 4 and 6 0 and 0

12. Photosystem II is mainly located in the:

Stroma Cytochrome Grana Mitochondrial surface

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13. Photosynthesis is best described as a:

Oxidative, exergonic, catabolic process Redox, endergonic, anabolic process Reductive, exergonic, catabolic process Fermentative, endergonic process

14. The light-independent reactions take place in the:

Photosystem I Photosystem II Stromal matrix Thylakoid lumen

15. Energy required for ATP synthesis in PS II is mainly supplied by the:

Proton gradient Electron gradient Oxidation of glucose Reduction of glucose

FREE TEST 2

Test 2 — Photosynthesis in Higher Plants

15 MCQs • Submit to view correct answers • 1 mark each

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1. In Ingenhousz's experiment, the bubbles released by green plant parts in bright sunlight were identified as:

CO₂ H₂O O₂ H₂

2. The main products of the light reaction are:

Carbohydrate only ATP only NADPH₂, ATP and O₂ NADH and glucose

3. Which is NOT an external factor influencing photosynthesis?

CO₂ concentration O₂ concentration Water availability Chlorophyll concentration

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4. In photosystem I, the first electron acceptor is associated with an:

Iron-sulphur protein Cytochrome b Plastocyanin ATP synthase

5. PEP is the primary CO₂ acceptor in:

C₃ plants C₄ plants C₂ plants All plants equally

6. CAM adaptation mainly helps plants in:

Secondary growth Conserving water Disease resistance Reproduction

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7. Which pigment absorbs light energy for photosynthesis?

Chlorophyll Water O₂ RuBP

8. Photorespiration is favoured by:

High O₂ and low CO₂ Low O₂ and high CO₂ Low temperature and high CO₂ High CO₂ and low light

9. Which set of ions is involved in oxygen liberation during photolysis of water?

Na⁺, K⁺ and Mg²⁺ Mn²⁺, Ca²⁺ and Cl⁻ Fe²⁺, Zn²⁺ and Cu²⁺ K⁺, Cl⁻ and Na⁺

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10. Cytochrome is best described as an:

Fe-containing porphyrin pigment Lipid Glycoprotein Flavoprotein only

11. In the Hatch-Slack pathway, initial fixation of CO₂ occurs in:

Mesophyll cells Bundle sheath cells Guard cells Epidermal cells

12. C₄ photosynthesis is less limited by atmospheric CO₂ mainly because of:

Effective CO₂ concentration in bundle sheath cells Absence of chlorophyll Lower ATP production Complete absence of Calvin cycle

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13. Glucose synthesis in the Calvin cycle occurs during the:

Carboxylation stage Oxygenation stage Reduction stage Regeneration stage

14. Who proposed that oxygen evolved during photosynthesis comes from water based on work with sulphur bacteria?

Sachs Engelmann van Niel Blackmann

15. CO₂-concentrating mechanisms are characteristic of:

Only C₃ plants C₄ and CAM plants Only temperate plants Only aquatic plants

FREE TEST 3

Test 3 — Photosynthesis in Higher Plants

15 MCQs • Submit to view correct answers • 1 mark each

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1. Chlorophyll in chloroplasts is located in the:

Grana/thylakoid membranes Pyrenoid Stroma fluid only Chloroplast envelope

2. Which statement about cyclic photophosphorylation is correct?

Both PSI and PSII are required Only PSI is functional Both ATP and NADPH are formed O₂ is released

3. Splitting of water is associated with:

Photosystem I Photosystem II Both PSI and PSII equally Stroma only

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4. Which is NOT a product of the light reaction?

NADPH NADH ATP O₂

5. The optimum temperature range given for C₃ plants is approximately:

10–25°C 30–45°C 45–60°C 0–5°C

6. The main difference between chlorophyll a and chlorophyll b includes a change from:

–CH₃ in a to –CHO in b Mg in a to Fe in b N in a to O in b Phytol in a to glucose in b

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7. The scientist who showed that green plant parts form glucose which is stored as starch was:

Sachs Engelmann van Niel Blackmann

8. In a C₄ leaf, the mesophyll chloroplasts are generally:

Granal and active in light reactions Agranlal and lacking pigments Absent Located in the bundle sheath only

9. In a C₄ leaf, the bundle sheath chloroplasts are generally:

Large and agranal Small and highly granal Absent Only in epidermal cells

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10. The absorption spectrum is a graph showing:

Light absorbed by a pigment at different wavelengths CO₂ concentration in soil Temperature against humidity ATP production against time only

11. The correct order of the Calvin cycle stages is:

Reduction → Carboxylation → Regeneration Carboxylation → Reduction → Regeneration Regeneration → Reduction → Carboxylation Reduction → Regeneration → Carboxylation

12. The first stable product of CO₂ fixation in C₃ plants is:

OAA Malic acid 3-PGA PEP

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13. The first CO₂ acceptor in C₄ plants is:

RuBP PEP 3-PGA OAA

14. In C₄ plants, the Calvin cycle mainly operates in the:

Stroma of bundle sheath chloroplasts Grana of mesophyll chloroplasts Cytoplasm of epidermal cells Thylakoid lumen

15. CAM plants generally open their stomata:

During the day only During the night and close them during the day At noon only Never

FREE TEST 4

Test 4 — Photosynthesis in Higher Plants

15 MCQs • Submit to view correct answers • 1 mark each

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1. Which molecule is the CO₂ acceptor in the Calvin cycle of C₃ plants?

PEP RuBP PGA RMP

2. The highest proton concentration during photosynthetic chemiosmosis is found in the:

Stroma Thylakoid lumen Antenna complex Chloroplast envelope

3. Malic acid formation during initial CO₂ fixation in C₄ leaves occurs in:

Epidermal cells Mesophyll cells Bundle sheath cells Phloem

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4. C₄ plants are generally more efficient than C₃ plants because they have:

A lower rate of photorespiration No chlorophyll No ATP production Only one photosystem

5. In C₄ plants, Calvin cycle enzymes are mainly present in chloroplasts of:

Mesophyll cells Bundle sheath cells Guard cells Epidermal cells

6. Ruben and Kamen's tracer experiments supported the conclusion that photosynthetic O₂ comes from:

CO₂ Glucose Water RuBP

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7. Photophosphorylation means:

Synthesis of ATP from ADP and Pi using light-driven processes Breakdown of ATP in darkness Synthesis of glucose from starch Oxidation of NADH

8. The Warburg effect refers to a decrease in photosynthetic rate at:

Very high O₂ concentration Very low O₂ concentration Very low light only Very high CO₂ only

9. Accessory photosynthetic pigments in most green plants include:

Only chlorophyll a Chlorophyll b and carotenoids/xanthophylls Only chlorophyll b Only RuBP

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10. The correct sequence of organelles involved in photorespiration is:

Chloroplast → peroxisome → mitochondrion Chloroplast → Golgi → mitochondrion Mitochondrion → chloroplast → peroxisome Peroxisome → vacuole → chloroplast

11. Photosynthetic pigments in chloroplasts are mainly located in:

Thylakoid membranes Chloroplast DNA Stroma fluid only Cell wall

12. Chromatophores in phototrophic bacteria are associated with:

Photosynthesis Movement Growth Cell division

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13. Emerson's enhancement effect and red drop helped establish the existence of:

Two photosystems operating together Only cyclic photophosphorylation Only PS I Oxidative phosphorylation

14. The photosynthetically active radiation (PAR) range is approximately:

100–390 nm 400–700 nm 760–10,000 nm 200–300 nm

15. Which light colour is least effective for photosynthesis according to the source?

Blue Green Red Violet

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