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Jharkhand Academic Council (JAC)
Class XII
Biology
Principles of Inheritance and Variation (Set 01 (Foundation Level))

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Jharkhand Academic Council (JAC) Class XII Biology Set 01 (Foundation Level) English Medium 100% Free Practice Test

JAC Board Class 12 Biology: Principles of Inheritance and Variation Online Test (Set 01 (Foundation Level)) | Jharkhand Board

Principles of Inheritance and Variation — Set 01 (Foundation Level)

Practise free online MCQ mock test for JAC Board Class 12 Biology chapter 'Principles of Inheritance and Variation'. 20 MCQs with timer countdown, detailed explanations, and instant results as per board syllabus.

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20 MCQs

Questions

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20 Mins

Duration

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20 Marks

Total Marks

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+1.0

Per Correct

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0.0

Negative Mark

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English

Language

Start Test Now (English Medium)

Instant Scorecard Step-by-Step Solutions JCERT / JAC Curriculum

Chapter Study Guide & In-Depth Notes

Master the key concepts, vocabulary, and high-yield questions before starting the test.

3 Sections

Chapter Overview & Core Concepts: Principles of Inheritance and Variation

Class 12 Study Guide

Mastering Principles of Inheritance and Variation in Class 12 provides critical subject intuition, analytical skills, and examination readiness.

Examinations test fundamental principles, definitions, cause-and-effect reasoning, and real-world applications under timed conditions.

Core Moral & Key Takeaway:

Grasping core concepts and practicing with timed chapter-wise CBT tests guarantees top performance in board exams.

Key Terminology, Definitions & Principles

Glossary & Concepts

Term / Formula	Type	Definition / Meaning	Explanation / Notes	Example / Usage
Core Concept	Principle	Primary concept governing Principles of Inheritance and Variation.	मुख्य सिद्धांत	"Understand and apply the principle accurately."
Analytical Deduction	Skill	Evaluating evidence to draw correct conclusions.	तार्किक विश्लेषण	"Examine question clues systematically."

Key Features & Devices Explored:

Systematic Elimination

Eliminate distractor choices before selecting the best answer.

Pacing & Accuracy

Complete each question within 60 seconds to maintain steady momentum.

High-Yield Revision Points & Solved Board Exam Q&A

Revision Notes

⚡ High-Yield Exam Takeaways:

Review all key textbook terms, definitions, and formulas.
Pay attention to units, boundary values, and key keywords in questions.
Solve Foundation Set 01 to build confidence, followed by Advanced Set 02 for exam excellence.

Frequently Asked Questions & Model Answers:

Q1 How should students prepare for Principles of Inheritance and Variation exams?

Answer: Read the chapter thoroughly, practice step-by-step solved examples, memorize key definitions, and evaluate preparation using timed online CBT mock tests.

Sample Questions Preview

Free Sneak Peek

Here is a sneak peek of the questions included in this test set. Test your preparation by viewing the answer and detailed explanation before starting the timed exam.

What is the phenotypic and genotypic ratio of a classical Mendelian Monohybrid cross in the F_2 generation (e.g. heterozygous Tall Tt × Tt)?

मेंडेल के एकसंकर संकरण (Monohybrid cross) की F_2 पीढ़ी में लक्षणप्ररूपी (Phenotypic) तथा जीनप्ररूपी (Genotypic) अनुपात क्या होता है?

Phenotypic Ratio = 9 : 3 : 3 : 1; Genotypic Ratio = 1 : 1 : 1 : 1फेनोटाइपिक अनुपात = 9 : 3 : 3 : 1; जीनोटाइपिक अनुपात = 1:1:1:1

Phenotypic Ratio = 1 : 2 : 1; Genotypic Ratio = 3 : 1फेनोटाइपिक अनुपात = 1:2:1; जीनोटाइपिक अनुपात = 3:1

Phenotypic Ratio = 3 : 1 (3 Tall : 1 Dwarf); Genotypic Ratio = 1 : 2 : 1 (1,TT : 2,Tt : 1,tt)लक्षणप्ररूपी अनुपात 3:1; जीनप्ररूपी अनुपात 1:2:1

Phenotypic Ratio = 1 : 1; Genotypic Ratio = 1 : 1फेनोटाइपिक अनुपात = 1:1; जीनोटाइपिक अनुपात = 1:1

Correct Answer: Option C

Explanation:

In monohybrid cross of heterozygous Tt × Tt: Offspring genotypes are 1,TT : 2,Tt : 1,tt (1:2:1). Because T is completely dominant over t, phenotypes are 3 Tall (TT, Tt) : 1 Dwarf (tt) (3:1).

F_2 में फीनोटाइप 3:1 तथा जीनोटाइप 1:2:1 होता है।

What is Incomplete Dominance and what are the phenotypic and genotypic ratios in the F_2 generation of Snapdragon (*Antirrhinum majus*) or 4 o'clock plant (*Mirabilis jalapa*)?

अपूर्ण प्रभाविता (Incomplete Dominance) में श्वानपुष्प (Snapdragon) की F_2 पीढ़ी का अनुपात क्या होता है?

All offspring are 100% whiteसभी संतानें 100% श्वेत हैं

Phenotypic 3:1 and Genotypic 1:2:1फेनोटाइपिक 3:1 और जीनोटाइपिक 1:2:1

Phenotypic 9:3:3:1फेनोटाइपिक 9:3:3:1

Phenotypic and Genotypic ratios are IDENTICAL: 1 : 2 : 1 (1 Red RR : 2 Pink Rr : 1 White rr)लक्षणप्ररूपी तथा जीनप्ररूपी दोनों अनुपात समान 1:2:1 (1 लाल : 2 गुलाबी : 1 सफेद)

Correct Answer: Option D

Explanation:

In incomplete dominance, neither allele is completely dominant. The heterozygous Rr produces intermediate Pink phenotype. Both phenotypic and genotypic ratios are 1 Red : 2 Pink : 1 White = 1:2:1.

अपूर्ण प्रभाविता में फीनोटाइप व जीनोटाइप दोनों 1:2:1 होते हैं।

How Chapter-Wise Online CBT Tests Build Winning Habits for Future Competitive Exams

Focused chapter-wise CBT practice builds the speed, mental stamina, and analytical discipline required to ace CUET, JEE Main, NEET UG, NDA, CA Foundation, and College Entrance Exams.

Competitive Edge

Real-Time Clock Awareness & Pacing

समय प्रबंधन एवं गति नियंत्रण

In school examinations, students write answers without active pacing. In national entrance tests, students have barely 45-60 seconds per MCQ. Practicing with a 20-minute timer instills instinctive time-budgeting and prevents last-minute exam panic.

Mastery of the Elimination Technique

विकल्प निष्कासन विधि में दक्षता

Top rankers in competitive exams rarely compute every problem blindly. They spot subtle traps, evaluate extreme values, and eliminate 2 out of 4 distractors within seconds. Our 4-option sets teach critical distractor analysis.

CBT Screen Stamina & Digital Comfort

कंप्यूटर आधारित परीक्षा का सहज अभ्यास

Almost all major national exams (CUET, JEE, NEET, SSC, Banking) are 100% computer-based. Students who only study on paper experience eye strain and navigation mistakes on exam day. Early CBT practice creates effortless digital fluency.

Immunity to Negative Marking

सटीकता और नकारात्मक अंकन से सुरक्षा

Careless errors—such as misreading "NOT" or "EXCEPT"—ruin thousands of competitive aspirations each year. Regular objective testing builds the habit of double-checking question keywords before locking answers.

Instant Diagnostic Feedback Loop

तत्काल त्रुटि निवारण एवं आत्म-मूल्यांकन

Traditional paper tests take weeks to grade, by which time the student has forgotten their thought process. TargetExams provides instant scorecards and step-by-step solutions while the conceptual puzzle is still fresh.

Syllabus Concepts Evaluated in this Chapter

This test series specifically evaluates the core competencies and learning objectives outlined in the official syllabus:

Core definitions, fundamental theorems, and essential concepts of this chapter.
Step-by-step mathematical reasoning and deductive problem-solving.
Application of standard formulas and operations in real-world scenarios.
Critical examination of common exam pitfalls and misleading options.
Higher-order thinking skill (HOTS) questions to prepare for school examinations.
Speed and accuracy mastery under standard timed CBT exam conditions.

Exam Rules & Test Taking Guidelines

Total Questions: The test consists of exactly 20 objective type questions.
Time Allowed: 20 Minutes countdown timer begins as soon as the test launches.
Marking Scheme: +1.0 mark is awarded for each correct answer.
Zero Penalty: There is 0.0 negative marking for incorrect or unattempted questions.
Question Palette: Freely navigate between questions and flag questions for later review.
Review & Solutions: Access instant scorecard and full step-by-step solutions upon submission.

Frequently Asked Questions (FAQs)

Yes! Foundation Practice Set 01 for every chapter in Jharkhand Academic Council (JAC) Class XII Biology is 100% free to attempt. Students can test their knowledge without any payment or hidden fees.

This page is dedicated to English Medium. You can also attempt this test in Hindi Medium by clicking the switcher at the top.

Absolutely. All 20 multiple-choice questions are strictly designed in line with the latest guidelines, covering both basic conceptual understanding and higher-order thinking skills.

The test contains 20 MCQs to be solved in 20 minutes. Each question carries +1.0 mark for a correct answer, and there is zero (0.0) negative marking for incorrect answers.

Yes. Immediately upon submitting your test, you receive a comprehensive performance summary including your total score, accuracy percentage, time spent per question, and full step-by-step explanations for all 20 questions.

Principles of Inheritance and Variation (Set 01 (Foundation Level))

20 MCQs • 20 Mins • 100% Free Practice Test

JAC Board Class 12 Biology: Principles of Inheritance and Variation Online Test (Set 01 (Foundation Level)) | Jharkhand Board

Chapter Study Guide & In-Depth Notes

Chapter Overview & Core Concepts: Principles of Inheritance and Variation