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Class 10 Science Quiz

Science MCQ Questions for Class 10

Practice Class 10 Science MCQ questions with answers, explanations and level-wise revision. Start from Easy levels and move toward Expert practice when your accuracy improves.

Class 10 Science Summary

Class 10 Science MCQ questions with answers, chapter wise quiz, topic wise practice, objective questions, exam revision aur answer explanation ke liye ye page banaya gaya hai. Important chapters include Chemical Substances – Nature and Behaviour, World of Living, Metals and Non-metals. Focus topics include Acids, Bases, and Salts, Carbon and its Compounds, Chemical Reactions and Equations, Metals and Non-metals.

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Class 10 Science MCQ Questions with Answers

Class 10 Science ke liye chapter wise MCQ questions, topic wise practice, objective questions, quiz levels, correct answers aur simple explanations ek hi page par available hain. Students board exam revision, school test preparation, daily practice aur concept clarity ke liye yahan se focused practice start kar sakte hain.

Science MCQ Class 10 Science Questions Chapter Wise Quiz Topic Wise Practice Answers and Explanations Easy to Expert Levels
Chapter Wise MCQ

Science Chapters for Class 10

Choose a Science chapter to practice focused MCQs with topic-wise revision, answers and explanations for Class 10. Chapters include Chemical Substances – Nature and Behaviour, World of Living, Metals and Non-metals, Carbon and its Compounds. Topics include Acids, Bases, and Salts, Carbon and its Compounds, Chemical Reactions and Equations, Metals and Non-metals, Control and Coordination.

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Level Map for Science MCQ Practice

Select a ready level to practice questions in a clean exam-style flow. Each level keeps the subject, class, difficulty and question count clear for faster revision.

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Easy Levels

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1 Level 1 Ready 101/50 Topics in this level Acids, Bases, and Salts50 Q The Making of Nationalism in Europe (Aristocracy, New Middle Class, Liberal Nationalism)26 Q Nationalism and Imperialism24 Q 2 Level 2 Ready 100/50 Topics in this level Carbon and its Compounds50 Q The Making of Nationalism in Europe (Aristocracy, New Middle Class, Liberal Nationalism)49 Q Nationalism and Imperialism1 Q 3 Level 3 Ready 100/50 Topics in this level Chemical Reactions and Equations50 Q The Making of Nationalism in Europe (Aristocracy, New Middle Class, Liberal Nationalism)49 Q Nationalism and Imperialism1 Q 4 Level 4 Ready 100/50 Topics in this level Chemical Reactions and Equations50 Q The Making of Nationalism in Europe (Aristocracy, New Middle Class, Liberal Nationalism)26 Q Nationalism and Imperialism24 Q 5 Level 5 Ready 100/50 Topics in this level Chemical Reactions and Equations50 Q The Age of Revolutions: 1830-184850 Q 6 Level 6 Ready 100/50 Topics in this level Chemical Reactions and Equations50 Q The Making of Germany and Italy50 Q 7 Level 7 Ready 100/50 Topics in this level Chemical Reactions and Equations50 Q The Making of Germany and Italy50 Q 8 Level 8 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q The French Revolution and the Idea of the Nation50 Q 9 Level 9 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q The French Revolution and the Idea of the Nation50 Q 10 Level 10 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q The French Revolution and the Idea of the Nation50 Q 11 Level 11 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q The French Revolution and the Idea of the Nation50 Q 12 Level 12 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q Visualising the Nation50 Q 13 Level 13 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q Visualising the Nation50 Q 14 Level 14 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q Visualising the Nation50 Q 15 Level 15 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q Visualising the Nation50 Q 16 Level 16 Ready 100/50 Topics in this level Control and Coordination50 Q The First World War, Khilafat, and Non-Cooperation50 Q 17 Level 17 Ready 100/50 Topics in this level Control and Coordination50 Q The First World War, Khilafat, and Non-Cooperation50 Q 18 Level 18 Ready 100/50 Topics in this level Control and Coordination50 Q The First World War, Khilafat, and Non-Cooperation50 Q 19 Level 19 Ready 100/50 Topics in this level Differing Strands within the Movement50 Q Heredity and Evolution50 Q 20 Level 20 Ready 100/50 Topics in this level Differing Strands within the Movement50 Q Heredity and Evolution50 Q 21 Level 21 Ready 100/50 Topics in this level Differing Strands within the Movement50 Q Heredity and Evolution50 Q 22 Level 22 Ready 100/50 Topics in this level Life Processes50 Q Towards Civil Disobedience50 Q 23 Level 23 Ready 100/50 Topics in this level Life Processes50 Q Towards Civil Disobedience50 Q 24 Level 24 Ready 100/50 Topics in this level Life Processes50 Q Towards Civil Disobedience50 Q 25 Level 25 Ready 100/50 Topics in this level Reproduction50 Q The Sense of Collective Belonging50 Q 26 Level 26 Ready 100/50 Topics in this level Reproduction50 Q The Sense of Collective Belonging50 Q 27 Level 27 Ready 100/50 Topics in this level Reproduction50 Q The Sense of Collective Belonging50 Q 28 Level 28 Locked 0/50 29 Level 29 Locked 0/50 30 Level 30 Locked 0/50

Medium Levels

Start
1 Level 1 Ready 100/50 Topics in this level Chemical Reactions and Equations50 Q The Making of Nationalism in Europe (Aristocracy, New Middle Class, Liberal Nationalism)50 Q 2 Level 2 Ready 100/50 Topics in this level Chemical Reactions and Equations50 Q The Making of Nationalism in Europe (Aristocracy, New Middle Class, Liberal Nationalism)50 Q 3 Level 3 Ready 100/50 Topics in this level Chemical Reactions and Equations50 Q Nationalism and Imperialism50 Q 4 Level 4 Ready 100/50 Topics in this level Chemical Reactions and Equations50 Q Nationalism and Imperialism50 Q 5 Level 5 Ready 100/50 Topics in this level Chemical Reactions and Equations50 Q The Age of Revolutions: 1830-184850 Q 6 Level 6 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q The Making of Germany and Italy50 Q 7 Level 7 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q The Making of Germany and Italy50 Q 8 Level 8 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q The French Revolution and the Idea of the Nation50 Q 9 Level 9 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q The French Revolution and the Idea of the Nation50 Q 10 Level 10 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q The French Revolution and the Idea of the Nation50 Q 11 Level 11 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q The French Revolution and the Idea of the Nation50 Q 12 Level 12 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q Visualising the Nation50 Q 13 Level 13 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q Visualising the Nation50 Q 14 Level 14 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q Visualising the Nation50 Q 15 Level 15 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q Visualising the Nation50 Q 16 Level 16 Ready 100/50 Topics in this level Control and Coordination50 Q The First World War, Khilafat, and Non-Cooperation50 Q 17 Level 17 Ready 100/50 Topics in this level Control and Coordination50 Q The First World War, Khilafat, and Non-Cooperation50 Q 18 Level 18 Ready 100/50 Topics in this level Control and Coordination50 Q The First World War, Khilafat, and Non-Cooperation50 Q 19 Level 19 Ready 100/50 Topics in this level Differing Strands within the Movement50 Q Heredity and Evolution50 Q 20 Level 20 Ready 100/50 Topics in this level Differing Strands within the Movement50 Q Heredity and Evolution50 Q 21 Level 21 Ready 100/50 Topics in this level Differing Strands within the Movement50 Q Heredity and Evolution50 Q 22 Level 22 Ready 100/50 Topics in this level Life Processes50 Q Towards Civil Disobedience50 Q 23 Level 23 Ready 100/50 Topics in this level Life Processes50 Q Towards Civil Disobedience50 Q 24 Level 24 Ready 100/50 Topics in this level Life Processes50 Q Towards Civil Disobedience50 Q 25 Level 25 Ready 100/50 Topics in this level Reproduction50 Q The Sense of Collective Belonging50 Q 26 Level 26 Ready 100/50 Topics in this level Reproduction50 Q The Sense of Collective Belonging50 Q 27 Level 27 Ready 100/50 Topics in this level Reproduction50 Q The Sense of Collective Belonging50 Q 28 Level 28 Locked 0/50 29 Level 29 Locked 0/50 30 Level 30 Locked 0/50

Hard Levels

Start
1 Level 1 Ready 100/50 Topics in this level Chemical Reactions and Equations50 Q The Making of Nationalism in Europe (Aristocracy, New Middle Class, Liberal Nationalism)50 Q 2 Level 2 Ready 100/50 Topics in this level Chemical Reactions and Equations50 Q The Making of Nationalism in Europe (Aristocracy, New Middle Class, Liberal Nationalism)50 Q 3 Level 3 Ready 100/50 Topics in this level Chemical Reactions and Equations50 Q The Age of Revolutions: 1830-184850 Q 4 Level 4 Ready 100/50 Topics in this level Chemical Reactions and Equations50 Q The Age of Revolutions: 1830-184850 Q 5 Level 5 Ready 100/50 Topics in this level Chemical Reactions and Equations50 Q The Making of Germany and Italy50 Q 6 Level 6 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q The Making of Germany and Italy50 Q 7 Level 7 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q The Making of Germany and Italy50 Q 8 Level 8 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q The French Revolution and the Idea of the Nation50 Q 9 Level 9 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q The French Revolution and the Idea of the Nation50 Q 10 Level 10 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q The French Revolution and the Idea of the Nation50 Q 11 Level 11 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q The French Revolution and the Idea of the Nation50 Q 12 Level 12 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q Visualising the Nation50 Q 13 Level 13 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q Visualising the Nation50 Q 14 Level 14 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q Visualising the Nation50 Q 15 Level 15 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q Visualising the Nation50 Q 16 Level 16 Ready 100/50 Topics in this level Control and Coordination50 Q The First World War, Khilafat, and Non-Cooperation50 Q 17 Level 17 Ready 100/50 Topics in this level Control and Coordination50 Q The First World War, Khilafat, and Non-Cooperation50 Q 18 Level 18 Ready 100/50 Topics in this level Control and Coordination50 Q The First World War, Khilafat, and Non-Cooperation50 Q 19 Level 19 Ready 100/50 Topics in this level Differing Strands within the Movement50 Q Heredity and Evolution50 Q 20 Level 20 Ready 100/50 Topics in this level Differing Strands within the Movement50 Q Heredity and Evolution50 Q 21 Level 21 Ready 100/50 Topics in this level Differing Strands within the Movement50 Q Heredity and Evolution50 Q 22 Level 22 Ready 100/50 Topics in this level Life Processes50 Q Towards Civil Disobedience50 Q 23 Level 23 Ready 100/50 Topics in this level Life Processes50 Q Towards Civil Disobedience50 Q 24 Level 24 Ready 100/50 Topics in this level Life Processes50 Q Towards Civil Disobedience50 Q 25 Level 25 Ready 100/50 Topics in this level Reproduction50 Q The Sense of Collective Belonging50 Q 26 Level 26 Ready 100/50 Topics in this level Reproduction50 Q The Sense of Collective Belonging50 Q 27 Level 27 Ready 100/50 Topics in this level Reproduction50 Q The Sense of Collective Belonging50 Q 28 Level 28 Locked 0/50 29 Level 29 Locked 0/50 30 Level 30 Locked 0/50

Expert Levels

Start
1 Level 1 Ready 100/50 Topics in this level Chemical Reactions and Equations50 Q Nationalism and Imperialism50 Q 2 Level 2 Ready 100/50 Topics in this level Chemical Reactions and Equations50 Q Nationalism and Imperialism50 Q 3 Level 3 Ready 100/50 Topics in this level Chemical Reactions and Equations50 Q The Age of Revolutions: 1830-184850 Q 4 Level 4 Ready 100/50 Topics in this level Chemical Reactions and Equations50 Q The Age of Revolutions: 1830-184850 Q 5 Level 5 Ready 100/50 Topics in this level Chemical Reactions and Equations50 Q The Making of Germany and Italy50 Q 6 Level 6 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q The Making of Germany and Italy50 Q 7 Level 7 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q The Making of Germany and Italy50 Q 8 Level 8 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q The Making of Germany and Italy50 Q 9 Level 9 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q The Making of Germany and Italy50 Q 10 Level 10 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q The French Revolution and the Idea of the Nation50 Q 11 Level 11 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q The French Revolution and the Idea of the Nation50 Q 12 Level 12 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q Visualising the Nation50 Q 13 Level 13 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q Visualising the Nation50 Q 14 Level 14 Ready 100/50 Topics in this level Acids, Bases, and Salts50 Q Visualising the Nation50 Q 15 Level 15 Ready 100/50 Topics in this level Carbon and its Compounds50 Q Visualising the Nation50 Q 16 Level 16 Ready 100/50 Topics in this level Control and Coordination50 Q The First World War, Khilafat, and Non-Cooperation50 Q 17 Level 17 Ready 100/50 Topics in this level Control and Coordination50 Q The First World War, Khilafat, and Non-Cooperation50 Q 18 Level 18 Ready 100/50 Topics in this level Control and Coordination50 Q The First World War, Khilafat, and Non-Cooperation50 Q 19 Level 19 Ready 100/50 Topics in this level Differing Strands within the Movement50 Q Heredity and Evolution50 Q 20 Level 20 Ready 100/50 Topics in this level Differing Strands within the Movement50 Q Heredity and Evolution50 Q 21 Level 21 Ready 100/50 Topics in this level Differing Strands within the Movement50 Q Heredity and Evolution50 Q 22 Level 22 Ready 100/50 Topics in this level Life Processes50 Q Towards Civil Disobedience50 Q 23 Level 23 Ready 100/50 Topics in this level Life Processes50 Q Towards Civil Disobedience50 Q 24 Level 24 Ready 100/50 Topics in this level Life Processes50 Q Towards Civil Disobedience50 Q 25 Level 25 Ready 100/50 Topics in this level Reproduction50 Q The Sense of Collective Belonging50 Q 26 Level 26 Ready 100/50 Topics in this level Reproduction50 Q The Sense of Collective Belonging50 Q 27 Level 27 Ready 100/50 Topics in this level Reproduction50 Q The Sense of Collective Belonging50 Q 28 Level 28 Locked 0/50 29 Level 29 Locked 0/50 30 Level 30 Locked 0/50

Latest Science Questions

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Question 1/50 Easy Science Electricity Electric current Class 10 Level 1

विद्युत जनित्र किस ऊर्जा परिवर्तन पर आधारित है?

Which energy conversion is an electric generator based on?

Explanation opens after your attempt
Correct Answer

B. यांत्रिक ऊर्जा से विद्युत ऊर्जाMechanical energy to electrical energy

Step 1

Concept

विद्युत जनित्र यांत्रिक ऊर्जा को विद्युत ऊर्जा में परिवर्तित करता है। / An electric generator converts mechanical energy into electrical energy.

Step 2

Why this answer is correct

जब चुंबकीय क्षेत्र में चालक कुंडली को घुमाया जाता है, तब विद्युत चुंबकीय प्रेरण के कारण उसमें विद्युत धारा उत्पन्न होती है। / When a conducting coil rotates in a magnetic field, an electric current is induced in it due to electromagnetic induction. Therefore, mechanical energy to electrical energy is the correct answer.

Step 3

Exam Tip

इसलिए सही उत्तर यांत्रिक ऊर्जा से विद्युत ऊर्जा है। परीक्षा में जनित्र और विद्युत मोटर के ऊर्जा परिवर्तन को विपरीत रूप में याद रखें। / For exams, remember that the energy conversions in a generator and an electric motor are opposite.

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Question 2/50 Expert Science World of Living Reproduction Class 10 Level 26

प्रजनन अध्याय का सबसे गहरा वैज्ञानिक निष्कर्ष कौन सा है?

What is the deepest scientific conclusion of the Reproduction chapter?

Explanation opens after your attempt
Correct Answer

A. प्रजनन जाति की निरंतरता रखता है और विविधता अनुकूलन में सहायता कर सकती हैReproduction maintains species continuity and variation can help adaptation

Step 1

Concept

प्रजनन से नए जीव बनते हैं। / Reproduction produces new organisms.

Step 2

Why this answer is correct

आनुवंशिक सूचना संतान तक पहुंचती है। / Genetic information passes to offspring.

Step 3

Exam Tip

विविधता विशेषकर लैंगिक प्रजनन में बनती है और बदलते वातावरण में उपयोगी हो सकती है। / Variation especially in sexual reproduction can be useful in changing environments.

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Question 3/50 Expert Science World of Living Reproduction Class 10 Level 26

मानव प्रजनन की घटनाओं का सबसे सही क्रम कौन सा है?

What is the most correct sequence of events in human reproduction?

Explanation opens after your attempt
Correct Answer

A. अंडोत्सर्जन निषेचन युग्मनज विभाजन गर्भाशय में जुड़नाOvulation fertilisation zygote division attachment in uterus

Step 1

Concept

अंडाशय से अंडाणु निकलता है। / Ovum is released from ovary.

Step 2

Why this answer is correct

अंडवाहिनी में शुक्राणु से मिलकर युग्मनज बन सकता है। / It may fuse with sperm in oviduct to form zygote.

Step 3

Exam Tip

विभाजन के बाद भ्रूण गर्भाशय में जुड़ता है। / After division embryo attaches in uterus.

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Question 4/50 Expert Science World of Living Reproduction Class 10 Level 26

पौधों में लैंगिक प्रजनन का सही क्रम कौन सा है?

What is the correct sequence of sexual reproduction in plants?

Explanation opens after your attempt
Correct Answer

A. परागण पराग नलिका निषेचन बीज और फल निर्माणPollination pollen tube fertilisation seed and fruit formation

Step 1

Concept

पहले परागकण वर्तिकाग्र तक पहुंचता है। / First pollen reaches the stigma.

Step 2

Why this answer is correct

पराग नलिका नर जनन कोशिका को बीजांड तक ले जाती है। / Pollen tube carries male gamete to ovule.

Step 3

Exam Tip

निषेचन के बाद बीजांड बीज और अंडाशय फल बनता है। / After fertilisation ovule becomes seed and ovary becomes fruit.

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Question 5/50 Expert Science World of Living Reproduction Class 10 Level 26

अत्यधिक त्रुटिपूर्ण आनुवंशिक प्रतिलिपि जीवित संतान के लिए क्यों खतरनाक हो सकती है?

Why can highly error prone genetic copying be dangerous for a living offspring?

Explanation opens after your attempt
Correct Answer

A. क्योंकि जरूरी लक्षण बिगड़ सकते हैंBecause essential traits may get disturbed

Step 1

Concept

थोड़ी त्रुटि विविधता दे सकती है। / A small error may create variation.

Step 2

Why this answer is correct

लेकिन बहुत अधिक त्रुटि आनुवंशिक सूचना को बिगाड़ सकती है। / Too many errors can disturb genetic information.

Step 3

Exam Tip

इससे जरूरी कार्यों वाले लक्षण प्रभावित होकर संतान कमजोर हो सकती है। / Essential traits may be affected and the offspring may become weak.

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Question 6/50 Expert Science World of Living Reproduction Class 10 Level 26

अलैंगिक और लैंगिक प्रजनन में विकास की दृष्टि से सबसे संतुलित तुलना कौन सी है?

Which is the most balanced comparison of asexual and sexual reproduction from an evolutionary view?

Explanation opens after your attempt
Correct Answer

A. अलैंगिक तेजी से संख्या बढ़ाता है और लैंगिक विविधता बढ़ाता हैAsexual rapidly increases number and sexual increases variation

Step 1

Concept

अलैंगिक प्रजनन में एक जनक से जल्दी संतान बन सकती है। / Asexual reproduction can quickly form offspring from one parent.

Step 2

Why this answer is correct

लैंगिक प्रजनन दो जनकों की सूचना मिलाता है। / Sexual reproduction combines information from two parents.

Step 3

Exam Tip

इसलिए पहला गति और दूसरा विविधता के लिए महत्वपूर्ण है। / Thus the first is important for speed and the second for variation.

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Question 7/50 Expert Science World of Living Reproduction Class 10 Level 26

अपरा की कार्यक्षमता घटने से भ्रूण पर दोहरा प्रभाव कैसे पड़ेगा?

How will reduced placental efficiency have a double effect on the embryo?

Explanation opens after your attempt
Correct Answer

A. पोषण और ऑक्सीजन कम मिलेंगे तथा अपशिष्ट हटना घटेगाNutrition and oxygen supply will decrease and waste removal will reduce

Step 1

Concept

अपरा भ्रूण को माता से पोषण और ऑक्सीजन दिलाती है। / Placenta provides nutrition and oxygen from mother to embryo.

Step 2

Why this answer is correct

यह भ्रूण के अपशिष्ट हटाने में भी मदद करती है। / It also helps remove wastes from embryo.

Step 3

Exam Tip

इसकी कमजोरी से दोनों दिशाओं का आदान प्रदान प्रभावित होगा। / Weak placenta affects exchange in both directions.

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Question 8/50 Expert Science World of Living Reproduction Class 10 Level 26

बीज रहित फल बनने की स्थिति में कौन सा कथन सबसे अधिक वैज्ञानिक है?

Which statement is most scientific in the case of seedless fruit formation?

Explanation opens after your attempt
Correct Answer

A. फल जैसी संरचना बन सकती है पर बीजांड से सामान्य बीज नहीं बनतेFruit like structure may form but normal seeds do not form from ovules

Step 1

Concept

सामान्यतः बीजांड निषेचन के बाद बीज बनता है। / Normally ovule becomes seed after fertilisation.

Step 2

Why this answer is correct

कुछ स्थितियों में फल जैसी वृद्धि बिना सामान्य बीज के हो सकती है। / In some cases fruit like growth can occur without normal seeds.

Step 3

Exam Tip

इसलिए बीज रहित फल में बीज निर्माण अधूरा रहता है। / Thus seed formation remains incomplete in seedless fruit.

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Question 9/50 Expert Science World of Living Reproduction Class 10 Level 26

यदि किसी फूल में वर्तिकाग्र परिपक्व है पर परागकोष में परागकण नहीं बने तो फल और बीज बनने के लिए क्या आवश्यक होगा?

If stigma is mature but anther has not produced pollen what is needed for fruit and seed formation?

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Correct Answer

A. दूसरे उपयुक्त फूल से परागकणPollen from another suitable flower

Step 1

Concept

वर्तिकाग्र परिपक्व होने से वह पराग ग्रहण कर सकता है। / A mature stigma can receive pollen.

Step 2

Why this answer is correct

परागकोष में पराग न हो तो उसी फूल से परागण नहीं होगा। / If anther has no pollen self pollen is unavailable.

Step 3

Exam Tip

दूसरे उपयुक्त फूल का पराग निषेचन में मदद कर सकता है। / Pollen from another suitable flower can help fertilisation.

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Question 10/50 Expert Science World of Living Reproduction Class 10 Level 26

परपरागण को बदलते वातावरण में स्वपरागण से अधिक उपयोगी कब माना जा सकता है?

When can cross pollination be considered more useful than self pollination in a changing environment?

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Correct Answer

A. जब संतानों में नए आनुवंशिक संयोजन लाभ दे सकते होंWhen new genetic combinations in offspring can provide advantage

Step 1

Concept

परपरागण अलग पौधों की सूचना मिलाता है। / Cross pollination combines information from different plants.

Step 2

Why this answer is correct

इससे विविधता बढ़ती है। / This increases variation.

Step 3

Exam Tip

बदलते वातावरण में कुछ नए संयोजन उपयोगी हो सकते हैं। / In changing environments some new combinations may be useful.

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Question 11/50 Expert Science World of Living Reproduction Class 10 Level 26

यदि जनन कोशिकाएं शरीर कोशिकाओं जैसी पूरी गुणसूत्र संख्या रखें तो पीढ़ियों में क्या समस्या होगी?

If gametes keep the full chromosome number like body cells what problem will occur across generations?

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Correct Answer

A. गुणसूत्र संख्या लगातार बढ़ेगीChromosome number will keep increasing

Step 1

Concept

निषेचन में दो जनन कोशिकाओं की सूचना मिलती है। / Fertilisation combines information from two gametes.

Step 2

Why this answer is correct

पूरी संख्या वाली दो कोशिकाएं मिलेंगी तो कुल संख्या बढ़ जाएगी। / If two full numbered cells fuse the total number will increase.

Step 3

Exam Tip

इसलिए जनन कोशिकाओं में आधी संख्या आवश्यक है। / So gametes must have half the number.

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Question 12/50 Expert Science World of Living Reproduction Class 10 Level 26

जनन कोशिकाओं में गुणसूत्र संख्या आधी होना लैंगिक प्रजनन में क्यों अनिवार्य है?

Why is half chromosome number in gametes essential in sexual reproduction?

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Correct Answer

A. निषेचन के बाद प्रजाति की सामान्य संख्या बनी रहेTo maintain normal chromosome number after fertilisation

Step 1

Concept

निषेचन में दो जनन कोशिकाएं मिलती हैं। / Two gametes fuse during fertilisation.

Step 2

Why this answer is correct

यदि दोनों में आधी संख्या हो तो मिलकर सामान्य संख्या बनती है। / If both have half number the normal number is restored after fusion.

Step 3

Exam Tip

इससे प्रजाति की गुणसूत्र संख्या स्थिर रहती है। / This keeps chromosome number stable in the species.

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