GATE XL Plant physiology and biochemistry PYQs & Answers

Questions 1–10 of 41. Imported answers require independent review unless marked reviewed.

Which one of the following terms best describes the plants that are adapted to grow in acidic soil?

Your answerChoose one option.

Halophytes

Oxylophytes

Lithophytes

Chasmophytes

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Which of the following amino acids contain(s) only one chiral center?

Your answerSelect all correct options. You can choose more than one.

Serine

Threonine

Isoleucine

Leucine

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Correctly match the following molecular assemblies in Group-I with their functions in Group-II.

Group-I: (P) Photosystem I (Q) Photosystem II (R) Cytochrome b₆f complex (S) CF₀ – CF₁ complex

Group-II: (1) Utilizes proton gradient for ATP synthesis (2) Transfers electron from reduced plastoquinone to oxidized plastocyanin (3) Drives transfer of electron from plastocyanin to ferredoxin (4) Oxidizes H₂O and reduces plastoquinone

Your answerChoose one option.

P–3; Q–4; R–1; S–2

P–3; Q–4; R–2; S–1

P–2; Q–4; R–3; S–1

P–4; Q–1; R–2; S–3

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Correctly match the following secondary metabolites in Group-I with their chemical classes in Group-II.

Group-I: (P) Codeine (Q) Podophyllotoxin (R) Resveratrol (S) Linamarin (T) Limonene

Group-II: (1) Flavones (2) Alkaloids (3) Lignans (4) Monoterpenes (5) Cyanogenic glycosides (6) Stilbenes

Your answerChoose one option.

P–1; Q–2; R–6; S–5; T–4

P–2; Q–5; R–6; S–3; T–4

P–2; Q–3; R–5; S–4; T–1

P–2; Q–3; R–6; S–5; T–4

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Which of the following combinations of photosynthetic carbon cycle in plants, and its matched biochemical reaction is/are correct?

Your answerSelect all correct options. You can choose more than one.

C3 pathway: Ribulose 1,5-bisphosphate + CO₂ + H₂O → 2 3-phosphoglycerate

C2 pathway: 2 Glycolate + 2 O₂ → 2 glyoxylate + 2 H₂O₂

C4 pathway: 2 2-Phosphoglycolate + 2 H₂O → 2 glycolate + 2 Pᵢ

CAM pathway: Phosphoenolpyruvate + HCO₃⁻ → oxaloacetate + Pᵢ

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Which of the following statements is/are correct about plant movement?

Your answerSelect all correct options. You can choose more than one.

Diaheliotropic refers to orienting the leaves perpendicular to the rays of the sun to maximize light interception.

Paraheliotropic refers to orienting the leaves parallel to the rays of the sun to minimize light interception.

Diaheliotropic refers to orienting the leaves parallel to the rays of the sun to minimize light interception.

Paraheliotropic refers to orienting the leaves perpendicular to the rays of the sun to maximize light interception.

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An enzyme following Michaelis-Menten kinetics, catalyses a reaction with an initial velocity (V₀) of 2 μM s⁻¹ at the substrate concentration of 10 μM. If the turnover number (kcat) of the enzyme for the given substrate is 500 s⁻¹ and the enzyme concentration in the reaction is 0.01 μM, then the value of the Michaelis-Menten constant (Kₘ) would be__________ × 10⁻⁶ M (in integer).

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In the history of photosynthetic research, the empirical reaction of photosynthesis was first proposed for green plants (equation 1), followed by another reaction for purple sulfur bacteria (equation 2), leading to a generalized equation for photosynthesis (equation 3)

where H₂A in equation 3 is a generalized electron donor.

Which one of the following statements is DISPROVEN by equation 3?

Your answerChoose one option.

The source of oxygen produced in photosynthesis in green plants is CO₂

The source of oxygen produced in photosynthesis in green plants is H₂O

Light is essential in every form of photosynthesis

Glucose is the end product in all forms of photosynthesis

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Correctly match the photosynthetic pathways (Group I) with their first stable products (Group II) in respective plants (Group III)

Group I: (P) C3 cycle; (Q) C4 cycle; (R) CAM Group II: (1) 3-Phosphoglycerate; (2) Glyceraldehyde-3-phosphate; (3) Oxaloacetate Group III: (a) Wheat; (b) Sugarcane; (c) Pineapple

Your answerChoose one option.

P-1-a; Q-3-b; R-3-c

P-1-a; Q-2-b; R-3-c

P-1-b; Q-3-a; R-2-c

P-1-b; Q-2-c; R-2-a

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Correctly match the economically important specialized metabolites (Group I) with their broad chemical classes (Group II).

Group I: (P) Azadirachtin; (Q) Saponin; (R) Gallocatechin; (S) Cocaine; (T) Menthol Group II: (1) Monoterpene; (2) Alkaloid; (3) Triterpene glycoside; (4) Polyphenol; (5) Triterpene

Your answerChoose one option.

P-5; Q-3; R-2; S-4; T-1

P-2; Q-4; R-3; S-1; T-5

P-5; Q-3; R-4; S-2; T-1

P-3; Q-5; R-4; S-2; T-1

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GATE XL Plant physiology and biochemistry PYQs

How to practice Plant physiology and biochemistry

Question 51

Question 53

Question 56

Question 57

Question 61

Question 63

Question 65

Question 55

Question 57

Question 59