Cytokinins, Ethylene, and ABA MCQs

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

14 Solved Questions • 11 Mins Practice • Updated for 2026 Competitive Exams
MCQS
2026 Solved Edition · Updated October 2026 · Verified Editorial Standards

Welcome to the verified preparation module for Cytokinins, Ethylene, and ABA 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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Cytokinins, Ethylene, and ABA 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.

14 MCQs Page 1

High-Yield Exam Revision Cheat Sheet & Mnemonics

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Topic Notes: Cytokinins, Ethylene, and ABA

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

1 1. Cytokinins: Structure and Function

4 points
  • Definition
    Cytokinins: A class of plant hormones that promote cell division (cytokinesis) and delay senescence in plant organs.
  • Fact
    Chemical Structure: Cytokinins are derivatives of the nitrogenous base adenine, specifically substituted with an isoprenoid or aromatic side chain at the N6 position.
  • Fact
    Primary Synthesis Site: Cytokinins are primarily synthesized in the root apical meristems and transported to the shoot via the xylem.
  • Theory
    Senescence Delay: Cytokinins prevent the breakdown of chlorophyll and proteins, effectively delaying the aging process in detached leaves.
Section 1 / 4
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1
Which of the following is a gaseous hormone involved in the abscission of leaves and fruits?
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2
Which plant hormone is synthesized in response to water stress to regulate water loss?
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3
The 'Richmond-Lang effect' refers to the ability of which hormone to retard senescence?
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4
Which hormone acts as a direct antagonist to the growth-promoting effects of gibberellins in seeds?
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5
What is the primary site of cytokinin synthesis in a vascular plant?
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6
Which hormone is commonly used to induce fruit ripening in climacteric fruits?
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7
The synthesis of Abscisic Acid occurs primarily in which plant plastids?
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8
Which of the following processes is delayed by the application of cytokinins?
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9
ABA induces stomatal closure by triggering the efflux of which ion from guard cells?
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10
Which hormone is responsible for the 'triple response' in etiolated pea seedlings?
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Pedagogical Syllabus Blueprint

Cytokinins, Ethylene, and ABA 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 Cytokinins, Ethylene, and ABA 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 Cytokinins, Ethylene, and ABA 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.