GATE XL Plant physiology and biochemistry PYQs & Answers — Page 2

Questions 11–20 of 41. Imported answers require independent review unless marked reviewed.

Which of the following sequential reactions correctly represent(s) the flow of electrons from NADH to O₂ in plant mitochondrial electron transport chain?

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NADH dehydrogenase → Ubiquinone → Succinate dehydrogenase → Cytochrome bc1 → Cytochrome c → Cytochrome c oxidase

NADH dehydrogenase → Succinate dehydrogenase → Ubiquinone → Cytochrome c → Cytochrome bc1 → Cytochrome c oxidase

NADH dehydrogenase → Ubiquinone → Alternative oxidase

NADH dehydrogenase → Alternative oxidase → Ubiquinone

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Which of the following reactions in plants is/are catalyzed by the malic enzymes?

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Malate + NAD⁺ → Pyruvate + CO₂ + NADH

Malate + NAD⁺ ⇌ Oxaloacetate + NADH

Malate ⇌ Fumarate

Malate + NADP⁺ → Pyruvate + CO₂ + NADPH

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Which of the following plant natural products is/are cyanogenic glycoside(s)?

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Linustatin

Limonene

Luteolin

Linamarin

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In Calvin-Benson cycle, to produce 1 molecule of glyceraldehyde 3-phosphate by fixing 3 molecules of carbon dioxide, 9 molecules of ATP and ______ molecules (in integer) of NADPH are typically utilized.

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Match the inhibitors in Group 1 with their respective targets in Group 2.

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P–i, Q–ii, R–iii, S–iv

P–iv, Q–i, R–ii, S–iii

P–iii, Q–i, R–iv, S–ii

P–iv, Q–ii, R–i, S–iii

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Identify the CORRECT combination(s) of plant natural products and the categories they belong to.

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Dhurrin – Phenolic compounds

Farnesene – Terpenoids

Naringenin – Cyanogenic glycosides

Vincristine – Alkaloids

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Identify the CORRECT combination(s) between the enzymes in Group 1 and the reactions in Group 2 they catalyze.

Group 1: (P) Cinnamate-4-hydroxylase; (Q) Glycerate kinase; (R) PEP carboxylase; (S) Nitrate reductase.

Group 2: (i) L-phenylalanine → Cinnamic acid; (ii) Glyceraldehyde 3-phosphate → dihydroacetone phosphate; (iii) Glycolate + O₂ → Glyoxylate + H₂O₂; (iv) NO₃⁻ + NAD(P)H + H⁺ → NO₂⁻ + NAD(P)⁺ + H₂O

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S–iv

Q–ii

P–i

R–iii

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Rotenone is a chemical often used to kill insect pests on crop plants and fishes in lakes. Rotenone acts by inhibiting electron transport from the NADH dehydrogenase enzyme in Complex I to ubiquinone in the mitochondrial electron transport chain. Which one of the following explains why plants can tolerate rotenone application?

Your answerChoose one option.

The Complex I in plants is resistant to rotenone.

Plants inactivate rotenone by enzymatic degradation.

Plants have specific channels that efflux rotenone out of the cell.

Plants have additional NAD(P)H dehydrogenases that are resistant to rotenone.

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Regulation of phosphoenolpyruvate carboxylase (PEPCase) governs CO₂ fixation in both C4 and CAM (crassulacean acid metabolism) plants. Which one or more of the following statements with respect to PEPCase activity is/are CORRECT?

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PEPCase in C4 plants is inactivated by dephosphorylation during the day.

PEPCase in CAM plants is inactivated by dephosphorylation during the day.

PEPCase in C4 plants is inactivated by dephosphorylation at night.

PEPCase in CAM plants is inactivated by dephosphorylation at night.

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Blue light can directly induce opening of stomata. Blue light also triggers photosynthesis in the guard cells, which indirectly induces stomatal opening. Which one or more of the following experimental approaches would test the direct effect of blue light on stomatal opening?

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Application of low photon fluxes of red light followed by high fluence rate of blue light.

Application of high fluence rates of red light followed by low photon fluxes of blue light.

Application of high fluence rates of blue light followed by high photon fluxes of red light.

Inhibition of photosynthetic electron transport by dichlorophenyldimethylurea (DCMU).

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GATE XL Plant physiology and biochemistry PYQs

Question 62

Question 64

Question 50

Question 54

Question 56

Question 62

Question 63

Question 48

Question 52

Question 62