NEET-UG Biology · Class 11
Auxins, gibberellins and cytokinins — NEET & JEE Questions
Auxins, gibberellins and cytokinins is a topic in Plant Growth and Development, a Class 11 Biology chapter of the NEET-UG syllabus. TestBudy holds 12 published NEET-UG questions on Auxins, gibberellins and cytokinins, each with the marking scheme of the real paper.
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Auxins, gibberellins and cytokinins MCQs with solutions
10 of the 12 published questions on this topic, exactly as they appear in a test. Answers and worked solutions come with your result rather than on this page.
Which plant growth regulator is especially associated with apical dominance?
- A. Auxin
- B. Cytokinin
- C. Abscisic acid
- D. Ethylene
Why can pruning the shoot tip promote branching in many plants?
- A. It eliminates all cytokinin activity
- B. Reduced auxin inhibition of buds
- C. It causes permanent seed dormancy
- D. It blocks all cell division
Auxins are especially associated with
- A. cell elongation and apical dominance
- B. blood glucose regulation
- C. antibody production
- D. DNA replication only
Cytokinins are particularly known for promoting
- A. cell division
- B. fruit ripening only
- C. stomatal closure only
- D. seed dormancy exclusively
A dwarf plant shows rapid stem elongation after hormone treatment. Which regulator best explains the response?
- A. Ethylene
- B. Abscisic acid
- C. Gibberellin
- D. A dormancy signal
A plant treated with gibberellin shows marked stem elongation. This is consistent with gibberellins promoting
- A. internode elongation
- B. root death
- C. leaf abscission only
- D. complete dormancy
Removal of the shoot apex often allows lateral buds to grow more strongly because
- A. the auxin-mediated apical dominance is reduced
- B. cytokinin disappears from all tissues
- C. gibberellin production stops permanently
- D. photosynthesis ceases
Which growth regulator is commonly used to promote bolting or stem elongation in some rosette plants?
- A. Gibberellin
- B. Cytokinin
- C. Auxin only
- D. Abscisic acid
Cultured plant tissue forms many shoots when cytokinin influence is high relative to auxin. What does this show?
- A. Plant hormones act independently
- B. Auxin alone controls organ formation
- C. Cytokinin always suppresses shoots
- D. Hormone balance directs development
A tissue-culture medium contains a relatively high cytokinin-to-auxin ratio. Which developmental response is commonly promoted?
- A. Shoot formation
- B. Root formation only
- C. Complete absence of organ formation
- D. Seed dormancy
Common mistakes in Auxins, gibberellins and cytokinins
Recorded against questions in this topic that are not shown above, so none of these points at an answer you can see on this page.
- Chooses a hormone mainly associated with senescence or stress instead of elongation.
- Uses one generic 'growth hormone' label instead of distinguishing regulator-specific effects.
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