Cytokinins and Ethylene MCQs

Prepare for Cytokinins and Ethylene 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 Cytokinins and Ethylene 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 (Botany).

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

Direct Definition & Conceptual Scope

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Cytokinins and Ethylene constitutes an essential examination topic within Botany, 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

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Topic Notes: Cytokinins and Ethylene

Quick Revision 3 min read 17 key points
Section 1 of 5

1 1. Cytokinins: Definition and Biosynthesis

4 points
  • Definition
    Cytokinins: A class of plant growth substances that promote cell division (cytokinesis) in plant roots and shoots, primarily acting by stimulating the cell cycle.
  • Fact
    Zeatin: The most common naturally occurring cytokinin, originally isolated from maize (Zea mays) endosperm, characterized by an adenine derivative structure.
  • Fact
    Primary Synthesis Site: Cytokinins are primarily synthesized in the root apical meristems and transported upward through the xylem to the shoot system.
  • Fact
    Structural Foundation: Naturally occurring cytokinins are adenine-based nitrogenous bases, specifically N6-substituted adenine compounds.
Section 1 / 5
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1
Which physiological phenomenon is caused by the interaction of ethylene and auxin in the stem?
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2
Cytokinins promote the transition from proplastids to which organelle?
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3
The rate-limiting step in ethylene biosynthesis is catalyzed by which enzyme?
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4
Which plant hormone is known to antagonize the effects of ethylene in the formation of the abscission zone?
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5
What is the primary function of the ETR1 protein in ethylene signaling?
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6
Which process describes the role of cytokinins in delaying leaf senescence?
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7
Ethylene inhibits the elongation of stems in many dicot seedlings by promoting which process?
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8
What is the effect of high cytokinin-to-auxin ratios in plant tissue culture?
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9
Which nitrogenous base is the structural foundation of naturally occurring cytokinins like zeatin?
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10
The 'triple response' in etiolated pea seedlings is a classic bioassay for which plant hormone?
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Pedagogical Syllabus Blueprint

Cytokinins and Ethylene 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 and Ethylene 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 and Ethylene 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 Botany, 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.