#practice MCQ

PSS- Sec G- Sec metabolites

Which enzyme converts cyanogenic glycosides into toxic products in herbivores?

That points to B: β-glucosidase. Compared with the other options, β-glucosidase is the one that correctly describes the PSS- Sec G- Sec metabolites concept. The wrong ones are A) ACC oxidase; C) Peroxidase; D) Catalase. If you’re stuck, eliminate anything that contradicts a basic fact you already know for this topic.

Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.

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PSS- Sec G- Sec metabolites

Methionine serves as precursor for biosynthesis of:

Pick B: Glucosinolates. Thinking through PSS- Sec G- Sec metabolites step by step rules out the lookalikes and leaves Glucosinolates. Skip these: A) Alkaloids; C) Phenolics; D) Terpenoids. For hormones and genes, match the molecule or gene to its real role, not a neighboring pathway.

Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.

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PSS- Sec G- Sec metabolites

Brassicaceae plants characteristically accumulate:

Glucosinolates (D) is correct here. This is core PSS- Sec G- Sec metabolites: once you know the definition or pathway step, Glucosinolates is the clear fit. The wrong ones are A) Alkaloids; B) Terpenoids; C) Phenolics. If the topic is about gradients or potentials, water/solutes move from higher to lower of the relevant quantity.

Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.

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PSS- Sec G- Sec metabolites

Most powerful natural insect feeding deterrent is:

Answer: C) Azadirachtin. For PSS- Sec G- Sec metabolites, remember the key idea and you’ll land on this option; the distractors usually swap cause and effect or confuse similar terms. Avoid: A) Nicotine; B) Pyrethrin; D) Caffeine. Name the process first, then pick the option that describes it — don’t reverse cause and effect.

Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.

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PSS- Sec G- Sec metabolites

Limonoids belong to which terpene class?

Pick D: Triterpenes. Thinking through PSS- Sec G- Sec metabolites step by step rules out the lookalikes and leaves Triterpenes. Skip these: A) Monoterpenes; B) Sesquiterpenes; C) Diterpenes. For hormones and genes, match the molecule or gene to its real role, not a neighboring pathway.

Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.

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PSS- Sec G- Sec metabolites

Azadirachtin is classified as a:

Answer: C) Limonoid. For PSS- Sec G- Sec metabolites, remember the key idea and you’ll land on this option; the distractors usually swap cause and effect or confuse similar terms. Avoid: A) Alkaloid; B) Phenolic; D) Flavonoid. Name the process first, then pick the option that describes it — don’t reverse cause and effect.

Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.

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PSS- Sec G- Sec metabolites

In lignin biosynthesis, feedback inhibition regulates which enzyme in the pathway?

C fits best: Z. Keep the PSS- Sec G- Sec metabolites basics straight and Z stands out as the precise answer. Avoid: A) X; B) Y; D) All enzymes. Light and flowering items often hinge on which photoreceptor or day-length rule is in play.

Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.

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PSS- Sec G- Sec metabolites

Essential oils contributing to plant aroma are rich in:

Monoterpenes (C) is correct here. This is core PSS- Sec G- Sec metabolites: once you know the definition or pathway step, Monoterpenes is the clear fit. The wrong ones are A) Triterpenes; B) Phenolics; D) Alkaloids. If the topic is about gradients or potentials, water/solutes move from higher to lower of the relevant quantity.

Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.

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PSS- Sec G- Sec metabolites

Volatile terpenes stored in glandular hairs of herbs mainly belong to which classes?

That points to A: Monoterpenes and sesquiterpenes. Compared with the other options, Monoterpenes and sesquiterpenes is the one that correctly describes the PSS- Sec G- Sec metabolites concept. The wrong ones are B) Sesquiterpenes and triterpenes; C) Diterpenes and triterpenes; D) Triterpenes and tetraterpenes. If you’re stuck, eliminate anything that contradicts a basic fact you already know for this topic.

Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.

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Phytohormone ALL PYQS

Conversion of IBA to IAA occurs via β‑oxidation in:

Pick C: Peroxisomes. Thinking through Phytohormone ALL step by step rules out the lookalikes and leaves Peroxisomes. Skip these: A) Mitochondria; B) Plastids; D) Cytosol. For hormones and genes, match the molecule or gene to its real role, not a neighboring pathway.

Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.

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Phytohormone ALL PYQS

Auxin maintains apical dominance by repressing:

Axillary buds (C) is correct here. This is core Phytohormone ALL: once you know the definition or pathway step, Axillary buds is the clear fit. The wrong ones are A) Cytokinin; B) Strigolactone; D) Ethylene. If the topic is about gradients or potentials, water/solutes move from higher to lower of the relevant quantity.

Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.

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Phytohormone ALL PYQS

TIR1, GID1, COI1 and PYL1 are receptors for:

Correct option is A, Auxin, GA, JA, ABA. In Phytohormone ALL problems like this, the accurate statement is Auxin, GA, JA, ABA; the others are common mix-ups. Not these: B) GA, Auxin, CK, ABA; C) Auxin, CK, JA, ABA; D) Auxin, GA, SA, ABA. Tissue transport questions usually turn on xylem vs phloem, living vs dead cells, or source vs sink.

Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.

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