Class 9 Chemistry Chapter 10: Biomolecules Important Questions with Complete Solutions
Biomolecules are the building blocks of life, and mastering Chapter 10 of CBSE Class 9 Chemistry is essential for board success and competitive exams. This page provides the most important questions on carbohydrates, proteins, lipids, nucleic acids, and enzymes—with complete solutions aligned to NCERT 2024-25. Whether you're preparing for unit tests, pre-boards, or want deeper conceptual clarity, these curated questions help you score higher. CBSETUTOR.ai, India's most-trusted 24x7 AI tutor, has helped lakhs of CBSE students master chemistry through live doubt-solving and AI-powered practice. Start your free trial today.
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What Are Biomolecules? Definition and Types
Biomolecules are organic compounds found in living organisms, made primarily of carbon, hydrogen, oxygen, and nitrogen. NCERT Chapter 10 classifies four main types: carbohydrates (energy storage and structure), proteins (enzymes and structural support), lipids (energy storage and insulation), and nucleic acids (genetic information). Understanding their composition and functions forms the foundation for scoring well on CBSE Class 9 Chemistry exams and higher classes.
Important Questions on Carbohydrates with Solutions
Carbohydrates are classified as monosaccharides, disaccharides, and polysaccharides. Key CBSE questions include: Define carbohydrates and give examples (glucose, sucrose). What is the general formula CₙH₂ₙOₙ? Distinguish between reducing and non-reducing sugars. How is starch different from cellulose? Practice these MCQs and short-answer questions to build accuracy and speed for board exams and competitive tests.
Proteins: Structure, Function, and Exam Questions
Proteins are polymers of amino acids linked by peptide bonds. CBSE Chapter 10 emphasizes: What are amino acids? Why are proteins called macromolecules? Functions of proteins (enzymes, antibodies, hormones, muscle contraction). How many essential amino acids exist in humans? These concept-based questions appear frequently in board exams. Solve 5–7 quality questions per sitting for complete retention and problem-solving confidence.
Lipids and Nucleic Acids: Key Concepts and Questions
Lipids are hydrophobic molecules including fats, oils, and waxes, used for energy and insulation. Nucleic acids (DNA and RNA) store and transmit genetic information. Common CBSE questions: Distinguish between fats and oils. What is the difference between DNA and RNA? How are nucleotides arranged in DNA? Solve diagram-based questions on the structure of nucleotides to excel in practical and theory papers.
Enzymes: Nature's Biochemical Catalysts
Enzymes are protein catalysts that speed up biochemical reactions without being consumed. NCERT emphasizes enzyme specificity, active sites, and factors affecting enzyme activity (temperature, pH, substrate concentration). Top exam questions include: Define enzyme. Why are enzymes called biocatalysts? How does an enzyme work? What is enzyme denaturation? Practice numerical and concept-based questions to understand enzyme kinetics thoroughly.
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Short Answer Questions: 2-Mark and 3-Mark Practice
CBSE board exams often include 2-mark and 3-mark short-answer questions on Biomolecules. Examples: 'Explain the difference between starch and cellulose.' 'What role do enzymes play in digestion?' 'Define denaturation of proteins.' 'How are nucleotides linked in DNA?' Solve at least 15–20 such questions with timed practice to build speed and accuracy. Refer NCERT examples and diagrams for complete understanding.
Long Answer and Diagram-Based Questions
5-mark and diagram questions test deeper understanding. Typical examples: Draw and label the structure of glucose and fructose. Explain the lock-and-key model of enzyme action with a diagram. Describe the structure of a nucleotide and how nucleotides join. Compare the structure and function of DNA and RNA with labeled diagrams. Practice 8–10 such questions to ensure board-exam readiness and confident writing.
Tips for Scoring100% in Class 9 Chemistry Chapter 10
Master definitions, formulas, and structural diagrams first. Create mind maps linking biomolecule types to their functions. Solve NCERT textbook questions, then attempt question banks. Practice diagram labeling weekly. Use mnemonics for amino acids and nucleotide bases. Revise at least 3 times before exams. Solve mock tests under timed conditions. Join CBSETUTOR.ai's live sessions for doubt-clearing and expert tips tailored to your pace and learning style.
Common Misconceptions and How to Avoid Them
Students often confuse disaccharides with polysaccharides, or DNA with RNA. Clear myth: All carbohydrates are sugars (wrong—cellulose is a structural carbohydrate). Myth: Enzymes are always proteins (wrong—RNA can also act as an enzyme). Myth: Lipids dissolve in water (wrong—they are hydrophobic). Study NCERT tables, examples, and comparisons carefully. CBSETUTOR.ai's AI identifies your weak areas and sends targeted practice to clear misconceptions permanently.
Frequently asked questions
What are the 4 types of biomolecules covered in CBSE Class 9 Chapter 10?+
The four types are carbohydrates, proteins, lipids, and nucleic acids. Each has distinct functions: carbohydrates for energy, proteins for structure and enzymes, lipids for insulation, and nucleic acids for genetic information storage.
How can I differentiate between starch and cellulose in exams?+
Starch is a digestible polysaccharide made of glucose (energy storage in plants), while cellulose is non-digestible structural carbohydrate (plant cell walls). Both are polysaccharides but have different linkages and functions.
Is CBSETUTOR.ai free for Class 9 Chemistry?+
CBSETUTOR.ai offers a completely free trial with access to AI-powered practice, doubt-solving, and NCERT solutions. No credit card needed. Start your free trial today and explore unlimited chemistry help.
Does CBSETUTOR.ai support Hindi-medium students?+
Yes. CBSETUTOR.ai provides full Hindi-medium support for all CBSE chapters including Chemistry. Explanations, practice tests, and live doubt-solving are available in Hindi and English.
What is the difference between DNA and RNA at the Class 9 level?+
DNA contains deoxyribose sugar and is double-stranded; RNA contains ribose sugar and is usually single-stranded. DNA stores genetic info; RNA helps in protein synthesis. Both are nucleic acids made of nucleotides.
How many times should I revise Chapter 10 before the board exam?+
Revise at least 3–4 times: first for understanding, second for diagrams and definitions, third for practice questions, and fourth full mock-test revision. Space revisions 2 weeks apart for best retention.
What are the most frequently asked Chapter 10 questions in CBSE exams?+
Top questions: Define biomolecules, distinguish carbohydrate types, explain enzyme action with diagrams, compare DNA/RNA, describe amino acids, and draw nucleotide structures. Focus practice on these 6–8 core concepts.
Can CBSETUTOR.ai help me clear doubts in real-time?+
Yes. CBSETUTOR.ai offers 24x7 live doubt-solving sessions with certified CBSE educators. Post your chemistry question anytime and get explained answers within minutes, perfect for last-minute exam prep.
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