Auxins and Gibberellins MCQs

Prepare for Auxins and Gibberellins MCQs with verified questions, past-paper solutions, and conceptual explanations for CSS, PMS, FPSC, PPSC, and NTS examinations.

15 Solved Questions • 12 Mins Practice • Updated for 2026 Competitive Exams
MCQS
2026 Solved Edition · Updated October 2026 · Verified Editorial Standards

Welcome to the verified preparation module for Auxins and Gibberellins MCQs on McqsMind. This comprehensive set offers solved multiple-choice questions with answers, detailed explanations, and authentic past-paper style questions aligned with the latest syllabus of Plant Growth & Development (Biology).

100% Verified Answer Keys CSS, PMS, FPSC, PPSC, NTS Ready 2026/2027 Syllabus Guidelines

Direct Definition & Conceptual Scope

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Auxins and Gibberellins constitutes an essential examination topic within Biology, evaluating theoretical principles, historical context, and practical problem-solving applications. On MCQsMind, candidates practice verified past-paper solutions, conceptual breakdowns, and syllabus-aligned questions tailored for CSS, PMS, and competitive screening examinations.

Solved Questions

Practice with answers, explanations, and exam-focused revision notes.

15 MCQs Page 1

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Topic Notes: Auxins and Gibberellins

Quick Revision 2 min read 15 key points
Section 1 of 4

1 1. Nature and Discovery

4 points
  • Definition
    Auxins: A class of plant hormones characterized by their ability to induce cell elongation in stems, primarily synthesized in apical meristems and young leaves.
  • Fact
    Indole-3-Acetic Acid (IAA): The primary naturally occurring auxin in plants, derived from the amino acid tryptophan.
  • Fact
    Gibberellin Discovery: First identified in Japan (1926) by Eiichi Kurosawa while studying 'Bakanae' (foolish seedling) disease in rice, caused by the fungus Gibberella fujikuroi.
  • Theory
    Gibberellin Structure: Unlike auxins, gibberellins are diterpenes synthesized via the mevalonic acid pathway, functioning as growth-promoting hormones.
Section 1 / 4
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1
Which plant response is specifically regulated by the ratio of auxin to gibberellin in tissue culture?
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2
Which amino acid serves as the primary precursor for the biosynthesis of indole-3-acetic acid?
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3
How do gibberellins affect the dormancy of seeds and buds?
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4
Which phenomenon involves the bending of a plant towards a light source due to auxin redistribution?
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5
What is the primary site of auxin synthesis in a growing plant shoot?
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6
Which enzyme is responsible for the biosynthesis of gibberellins from mevalonic acid?
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7
The Acid Growth Hypothesis explains the mechanism of cell wall loosening by which hormone?
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8
What is the effect of gibberellin application on the fruit size of seedless grapes?
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9
Which synthetic auxin is widely used in agriculture as a selective herbicide for broad-leaved weeds?
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10
Which plant response is characterized by the elongation of internodes induced by gibberellins?
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Pedagogical Syllabus Blueprint

Auxins and Gibberellins MCQs: Preparation Strategy & Exam Blueprint

Examination Weightage & Commission Distribution

In Pakistan's premier competitive examinations—including the Federal Public Service Commission (FPSC General Recruitment & CSS MPT), Punjab Public Service Commission (PPSC Lecturer, Tehsildar & PMS Screening), KPPSC, SPSC, and BPSC—questions derived from Auxins and Gibberellins MCQs consistently constitute a decisive 10% to 25% weightage of the Plant Growth & Development paper. Testing agencies frequently evaluate both foundational factual recall and deeper analytical comprehension, requiring aspirants to master key dates, statutory articles, constitutional clauses, and thematic definitions.

High-Yield Conceptual Pillars & Distractor Analysis

Historical trend analysis across past five-year examination cycles demonstrates that examiner traps frequently involve closely matched numerical alternatives, chronologically contiguous treaties, and semantic subtleties in statutory phraseology. When preparing Auxins and Gibberellins MCQs, candidates must deliberately review the underlying rationale provided for every question rather than merely memorizing raw answer options. Understanding why incorrect distractors fail is the most reliable predictor of achieving top percentiles in computerized and optical mark recognition (OMR) screening tests.

Negative Marking Mitigation & Time Management Protocol

For examinations enforcing negative marking penalties (such as PPSC's 0.25-mark deduction per erroneous response or NTS gatekeeper quotas), an aggressive elimination technique must be deployed. Candidates should systematically rule out improbable options first to elevate probability thresholds from 25% to 50% or 100%. Allocating an average of 45 to 60 seconds per item during mock trials builds the psychological stamina and cognitive precision required to complete 100-question papers within official 90-minute time limits.

Recommended Reference Sources & Statutory Reading

To achieve definitive conceptual mastery in Biology, candidates are advised to cross-reference our solved explanations with primary gazettes, statutory texts, and canonical academic textbooks. Verifying controversial questions against authentic official repositories guarantees that prospective civil servants and professional candidates present incontestable answers during both optical paper evaluations and viva voce departmental interviews.