What is the primary role of gibberellins in sugarcane crops?
Gibberellins increase internode length in sugarcane, boosting sugar yield.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Photoperiodism Vernalisation and Development
#gibberellins
27 public questions tagged with this topic.
Filter questions
Which plant hormone increases sugar yield in sugarcane by promoting stem elongation?
Gibberellins increase internode length in sugarcane, thereby increasing sugar yield per plant.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Plant Growth Regulators - Cytokinins Ethylene and Abscisic Acid
Which scientist discovered that gibberellins cause abnormal elongation of rice seedlings?
E. Kurosawa discovered that gibberellins from the fungus *Gibberella fujikuroi* caused abnormal elongation in rice seedlings.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Plant Growth Regulators - Auxins and Gibberellins
Which of the following statements about gibberellins is incorrect?
Gibberellins promote seed germination, bolting, and parthenocarpy but do not delay fruit ripening. Ethylene is responsible for fruit ripening.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Plant Growth Regulators - Auxins and Gibberellins
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.
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.
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.
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.
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.
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.
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.
Bioactive gibberellin in cereals is:
GA1 (C) is correct here. This is core Gibberellins: once you know the definition or pathway step, GA1 is the clear fit. The wrong ones are A) GA3; B) GA4; D) GA7. 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.