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#gibberellins

28 public questions tagged with this topic.

Plant tissue culture 1

Gibberellins are mainly involved in:

Gibberellins are tetracyclic diterpenoid hormones with GA1 GA3 GA4 most bioactive functions centered on stem elongation, seed germination and floral transition. Biosynthesis proceeds from geranylgeranyl diphosphate via ent kaurene ent kaurenoic acid to GA12 catalyzed by terpene synthases and cytochrome P450 monooxygenases GA20 oxidase and GA3 oxidase. Signaling involves soluble receptor GID1 binding GA causing conformational change enabling interaction with DELLA repressors which are then ubiquitinated by SCF SLY1 GID2 complex and degraded via proteasome allowing transcription of growth genes.

Ref: Sun, Annu Rev Plant Biol 2008 GA-DELLA signaling; NCBI NBK10975 gibberellin pathway.

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Phytohormone ALL PYQS

GA biosynthesis genes in fungi are usually:

That points to C: Clustered on chromosomes. Compared with the other options, Clustered on chromosomes is the one that correctly describes the Phytohormone ALL concept. The wrong ones are A) Randomly distributed; B) Plastid localized; D) Absent. 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

Gibberellins are chemically classified as?

The right choice is B: Diterpenes. In Phytohormone ALL, that matches how the process or concept actually works — the other choices mix up related ideas or use the wrong mechanism. Skip these: A) Monoterpenes; C) Triterpenes; D) Sesquiterpenes. A quick check: if an option needs energy, pumps, or the opposite direction of movement, ask whether that really applies.

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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Gibberellins

GA promotes flowering in Arabidopsis by activating:

The right choice is B: LFY. In Gibberellins, that matches how the process or concept actually works — the other choices mix up related ideas or use the wrong mechanism. Skip these: A) FT; C) CO; D) FLC. A quick check: if an option needs energy, pumps, or the opposite direction of movement, ask whether that really applies.

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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Gibberellins

Bolting in rosette plants is induced by:

The right choice is C: Gibberellin. In Gibberellins, that matches how the process or concept actually works — the other choices mix up related ideas or use the wrong mechanism. Skip these: A) Auxin; B) Cytokinin; D) Ethylene. A quick check: if an option needs energy, pumps, or the opposite direction of movement, ask whether that really applies.

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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Gibberellins

Semi-dwarf rice varieties possess mutation in gene encoding:

GA20ox (C) is correct here. This is core Gibberellins: once you know the definition or pathway step, GA20ox is the clear fit. The wrong ones are A) GA3ox; B) GA2ox; D) GID1. 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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Gibberellins

High ABA:GA ratio results in:

Answer: C) Dormancy. For Gibberellins, remember the key idea and you’ll land on this option; the distractors usually swap cause and effect or confuse similar terms. Avoid: A) Germination; B) PCD induction; D) Bolting. 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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Gibberellins

Hormone antagonistic to GA during seed germination is:

Go with C — ABA. Under Gibberellins, this is the standard explanation you’d use in class: it names the real driver or definition, while the rest are nearby but wrong. Not these: A) Auxin; B) Ethylene; D) Cytokinin. When two options sound similar, choose the one that matches the textbook definition most tightly.

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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