#botany MCQs

Ethylene

Maximum ethylene production occurs in:

Ripening fruits (C) is correct here. This is core Ethylene: once you know the definition or pathway step, Ripening fruits is the clear fit. The wrong ones are A) Young leaves; B) Roots; D) Meristems. 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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Ethylene

Ethylene is the only plant hormone that is:

That points to C: Gaseous. Compared with the other options, Gaseous is the one that correctly describes the Ethylene concept. The wrong ones are A) Water soluble; B) Steroidal; D) Nitrogenous. 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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Ethylene

Ethylene is chemically classified as:

Pick C: Simple hydrocarbon. Thinking through Ethylene step by step rules out the lookalikes and leaves Simple hydrocarbon. Skip these: A) Steroid; B) Terpene; D) Phenolic compound. 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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Cytokinin

Cytokinins delay leaf senescence by:

That points to B: Inhibiting chlorophyll degradation. Compared with the other options, Inhibiting chlorophyll degradation is the one that correctly describes the Cytokinin concept. The wrong ones are A) Promoting ABA; C) Increasing ethylene; D) Reducing photosynthesis. 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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Cytokinin

KISS ME DEADLY (KMD) proteins regulate cytokinin response by:

Degrading ARR-B (B) is correct here. This is core Cytokinin: once you know the definition or pathway step, Degrading ARR-B is the clear fit. The wrong ones are A) Activating ARR-B; C) Degrading ARR-A; D) Activating IPT. 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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Cytokinin

Type-A ARRs mainly function as:

Answer: B) Negative feedback regulators. For Cytokinin, remember the key idea and you’ll land on this option; the distractors usually swap cause and effect or confuse similar terms. Avoid: A) Positive regulators; C) Receptors; D) Kinases. 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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Striglactone

Cytokinin generally acts as a:

Pick B: Antagonist of SL. Thinking through Striglactone step by step rules out the lookalikes and leaves Antagonist of SL. Skip these: A) Synergist of SL; C) Precursor of SL; D) Receptor of SL. 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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Striglactone

BRC1 gene activated by strigolactones encodes:

Pick C: Transcription factor. Thinking through Striglactone step by step rules out the lookalikes and leaves Transcription factor. Skip these: A) Receptor; B) Enzyme; D) Transporter. 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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