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#gibberellin

7 public questions tagged with this topic.

plant Development - 1

Gibberellin-induced germination prominent in:

Gibberellin promotes germination by breaking seed dormancy and inducing hydrolytic enzymes mobilizing storage reserves toward growing embryo. Gibberellin-induced germination is particularly prominent in monocots especially cereals where embryo-synthesized GA diffuses to aleurone layer activating α-amylase gene expression via GAMYB Myb transcription factor degrading starchy endosperm releasing soluble sugars feeding embryo growth. This aleurone response is relatively minor in dicots where reserves reside in cotyledons. Malting in barley and brewing industries exploit GA-induced aleurone α-amyla

Ref: Bewley, Plant Cell 1997; Taiz Plant Physiology Chap 27: GA-induced germination prominent in monocot aleurone via α-amylase.

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Phytohormone ALL PYQS

GA induces α‑amylase expression in barley in the:

Pick C: Aleurone layer. Thinking through Phytohormone ALL step by step rules out the lookalikes and leaves Aleurone layer. Skip these: A) Embryo; B) Endosperm; D) Coleoptile. 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 and gibberellin signaling involves primarily:

Go with A — Proteasome‑mediated degradation. Under Phytohormone ALL, 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: B) Ion channels; C) MAPK cascades; D) Second messengers. 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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Gibberellins

GA signaling activates which transcription factor for α-amylase?

GA-MYB (C) is correct here. This is core Gibberellins: once you know the definition or pathway step, GA-MYB is the clear fit. The wrong ones are A) ARF; B) HY5; D) PIF. 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

F-box protein involved in GA signaling in Arabidopsis is:

Go with B — SLY1. 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) COI1; C) TIR1; D) AFB. 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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Gibberellins

Negative regulator of GA signaling is:

Go with C — DELLA. 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) MYB; B) PIF; D) GID1. 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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