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West Bengal Council of Higher Secondary Education (WBCHSE)
Class 12 (Higher Secondary)
Biology
Organisms and Populations (Set 01 (Foundation Level))

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West Bengal Council of Higher Secondary Education (WBCHSE) Class 12 (Higher Secondary) Biology Set 01 (Foundation Level) English Medium 100% Free Practice Test

West Bengal Council of Higher Secondary Education (WBCHSE) Class 12 (Higher Secondary) Biology: Organisms and Populations Online Test (Set 01 (Foundation Level))

Organisms and Populations — Set 01 (Foundation Level)

Practise free online CBT mock test for West Bengal Council of Higher Secondary Education (WBCHSE) Class 12 (Higher Secondary) Biology Chapter 11 'Organisms and Populations'. 20 MCQs, 20-minute timer, instant scorecard, and step-by-step solutions aligned with official board syllabus.

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20 MCQs

Questions

⏱️

20 Mins

Duration

🎯

20 Marks

Total Marks

➕

+1.0

Per Correct

🛡️

0.0

Negative Mark

🌐

English

Language

Start Test Now (English Medium)

Instant Scorecard Step-by-Step Solutions WBCHSE HS Syllabus Pattern

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: Organisms and Populations

Class 12 Study Guide

Mastering Organisms and Populations 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 Organisms and Populations.	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 Organisms and Populations 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 are Regulators, Conformers, and Partial Regulators in organismic responses to abiotic environmental factors?

পরিবেশীয় অজৈব নিয়ামকের প্রতি জীবের সাড়াদানের ভিত্তিতে নিয়ন্ত্রক (Regulators) এবং কনফরমার (Conformers) কারা?

अजैविक पर्यावरणीय कारकों के प्रति जैविक प्रतिक्रियाओं में नियामक, अनुरूपक और आंशिक नियामक क्या हैं?

Regulators: Maintain constant internal body temperature and osmolarity via physiological homeostasis (Mammals, Birds); Conformers: Cannot maintain internal homeostasis; body temperature/osmolarity changes with ambient environment (99% of animals and nearly all plants)নিয়ন্ত্রক: শারীরবৃত্তীয় সাম্যাবস্থা বজায় রেখে দেহের তাপমাত্রা নির্দিষ্ট রাখে (স্তন্যপায়ী ও পাখি); কনফরমার: অভ্যন্তরীণ পরিবেশ বজায় রাখতে পারে না, পরিবেশের সাথে দেহের তাপমাত্রা পরিবর্তিত হয় (৯৯% প্রাণী ও সমস্ত উদ্ভিদ)नियामक: शारीरिक होमियोस्टैसिस (स्तनधारी, पक्षी) के माध्यम से निरंतर आंतरिक शरीर के तापमान और परासरणता को बनाए रखें; अनुरूपकर्ता: आंतरिक होमियोस्टैसिस को बनाए नहीं रख सकते; शरीर का तापमान/परासरणीयता परिवेशीय वातावरण के साथ बदलती है (99% जानवर और लगभग सभी पौधे)

Regulators live only in iceনিয়ন্ত্রক কেবল বরফে থাকেनियामक केवल बर्फ में रहते हैं

Conformers produce heatকনফরমার তাপ তৈরি করেकन्फर्मर्स गर्मी पैदा करते हैं

Both are identicalউভয়ই অভিন্নदोनों एक जैसे हैं

Correct Answer: Option A

Explanation:

Regulators \(\frac{endotherms}{homeotherms}\) maintain homeostasis via thermoregulation \(\frac{sweating}{shivering}\). Conformers \(\frac{ectotherms}{poikilotherms}\) cannot expend energy to regulate internal temperature/osmolarity.

নিয়ন্ত্রকরা শক্তি খরচ করে দেহের তাপমাত্রা ৩৭°C স্থির রাখে, আর কনফরমাররা পরিবেশের তাপমাত্রার সাথে নিজেদের খাপ খাইয়ে নেয়।

नियामक (एंडोथर्म/होमोथर्म) थर्मोरेग्यूलेशन (पसीना/कंपकंपी) के माध्यम से होमोस्टैसिस को बनाए रखते हैं। कंफर्मर्स (एक्टोथर्म्स/पोइकिलोथर्म्स) आंतरिक तापमान/ऑस्मोलैरिटी को विनियमित करने के लिए ऊर्जा खर्च नहीं कर सकते हैं।

What is Allen's Rule regarding mammalian morphological adaptations in COLD CLIMATES?

শীতল জলবায়ুতে বসবাসকারী স্তন্যপায়ী প্রাণীদের শারীরিক গঠনের ক্ষেত্রে অ্যালেনের সূত্রটি (Allen's Rule) কী?

ठंडी जलवायु में स्तनधारी रूपात्मक अनुकूलन के संबंध में एलन का नियम क्या है?

Cold mammals have longer earsকান বড় হয়ठंडे स्तनधारियों के कान लंबे होते हैं

Cold mammals have no hairলোমহীন হয়ठंडे स्तनधारियों के बाल नहीं होते

Mammals from colder climates generally have SHORTER EARS AND SHORTER LIMBS to minimize surface area and reduce metabolic heat lossশীতল অঞ্চলের স্তন্যপায়ীদের কান ও হাত-পা ছোট হয় যাতে দৈহিক ক্ষেত্রফল কমে গিয়ে দেহের তাপের অপচয় সর্বনিম্ন হয়ठंडी जलवायु के स्तनधारियों के सतह क्षेत्र को कम करने और चयापचय ताप हानि को कम करने के लिए आम तौर पर छोटे कान और छोटे अंग होते हैं

Cold mammals cannot swimসাঁতার কাটতে পারে নাठंडे स्तनधारी तैर नहीं सकते

Correct Answer: Option C

Explanation:

Allen's Rule states that body appendages (ears, snout, tail, limbs) of warm-blooded animals are shorter in polar regions than in tropical relatives (e.g., Arctic Fox vs Desert Fox) to minimize heat dissipation.

মেরু অঞ্চলের প্রাণীদের কান ও অঙ্গ ছোট হওয়ায় ঠান্ডায় তাদের দেহ থেকে দ্রুত তাপ বাইরে বেরিয়ে যেতে পারে না।

एलन के नियम में कहा गया है कि गर्मी के अपव्यय को कम करने के लिए गर्म रक्त वाले जानवरों के शरीर के उपांग (कान, थूथन, पूंछ, अंग) उष्णकटिबंधीय रिश्तेदारों (उदाहरण के लिए, आर्कटिक फॉक्स बनाम डेजर्ट फॉक्स) की तुलना में ध्रुवीय क्षेत्रों में छोटे होते हैं।

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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 West Bengal Council of Higher Secondary Education (WBCHSE) Class 12 (Higher Secondary) Biology is 100% free to attempt. Students can test their preparation without any subscription or payment.

This test strictly follows the official West Bengal Council of Higher Secondary Education (WBCHSE) syllabus and curriculum for Class 12 (Higher Secondary), covering textbook concepts, formulas, and board-standard MCQs for Chapter 11.

This dedicated test page is conducted in English Medium. If you prefer taking the test in Bengali or Hindi, you can switch using the language switcher bar at the top or toggle languages during the exam.

The test comprises 20 MCQs to be completed in 20 minutes. Each question carries +1.0 mark for a correct response, and there is 0.0 negative marking for incorrect or unattempted questions.

Yes! Instantly after submitting your test, you receive a comprehensive digital scorecard with accuracy analysis, time breakdown, and step-by-step verified explanations for all 20 questions.

Organisms and Populations (Set 01 (Foundation Level))

20 MCQs • 20 Mins • 100% Free Practice Test

West Bengal Council of Higher Secondary Education (WBCHSE) Class 12 (Higher Secondary) Biology: Organisms and Populations Online Test (Set 01 (Foundation Level))

Chapter Study Guide & In-Depth Notes

Chapter Overview & Core Concepts: Organisms and Populations