Class 9 Biology Chapter 9 Biomolecules MCQ with Answers (30 Questions)
Biomolecules are the building blocks of life—carbohydrates, proteins, lipids, and nucleic acids that drive every biological process in your body. Class 9 Biology Chapter 9 introduces students to these essential organic compounds and their functions in living organisms. This comprehensive MCQ guide with answers helps you master biomolecules concepts, prepare for school exams, and build a strong foundation for higher classes. Whether you're revising before your term exam or strengthening weak topics, these 30 carefully curated multiple-choice questions align with NCERT 2024-25 standards and are designed to boost your confidence and scores.
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What Are Biomolecules? Definition & Types
Biomolecules are organic compounds synthesized by living organisms. According to NCERT Class 9 Biology Chapter 9, the four major types are carbohydrates (energy source), proteins (structural & functional), lipids (energy storage & insulation), and nucleic acids (genetic information carriers). Each type has distinct chemical structure and biological role. Understanding these definitions is essential for answering MCQs correctly and grasping biochemistry at deeper levels in senior classes.
Carbohydrates: Structure, Function & MCQ Practice
Carbohydrates are polyhydroxy aldehydes or ketones with general formula Cn(H₂O)m. NCERT explains monosaccharides (glucose, fructose), disaccharides (sucrose, maltose), and polysaccharides (starch, cellulose, glycogen). These MCQs test your understanding of glycosidic bonds, reducing vs non-reducing sugars, and roles in energy production and cell structure. Practice questions often ask about glucose fermentation, starch digestion, and cellulose functions in plants.
Proteins: Amino Acids, Bonds & Biological Roles
Proteins are polymers of amino acids linked by peptide bonds. Chapter 9 covers 20 common amino acids, primary/secondary/tertiary structures, and protein functions—enzymes, antibodies, hormones, transport. MCQs frequently test peptide bond formation, denaturation causes, and enzyme specificity. Know that proteins are essential for growth, repair, immunity, and metabolism. Common questions ask about disulfide bonds, R-groups, and how pH/temperature affect protein structure.
Lipids: Fats, Oils & Energy Storage Functions
Lipids are hydrophobic or amphipathic molecules including fats, oils, phospholipids, and steroids. NCERT Chapter 9 emphasizes saturated vs unsaturated fatty acids, triglyceride structure, and lipid roles in energy storage (9 kcal/g), insulation, and cell membrane formation. MCQs test solubility in water, emulsification, and how lipids differ from carbohydrates. Revision questions often compare animal fats (saturated) with plant oils (unsaturated) and their health implications.
Nucleic Acids: DNA, RNA & Genetic Information
Nucleic acids store and transmit genetic information through DNA and RNA. Each consists of nucleotides—nitrogenous bases (purines A, G; pyrimidines C, T, U), deoxyribose/ribose sugar, and phosphate group. NCERT explains complementary base pairing (A-T, G-C in DNA), double helix structure, and roles in protein synthesis. MCQs test nucleotide components, DNA vs RNA differences, codon recognition, and why nucleic acids are crucial for heredity and cell function.
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How to Solve Biomolecules MCQs: Strategy & Tips
Start by reading the NCERT chapter twice—once for overview, once for details. For MCQs: (1) Identify the biomolecule type being asked; (2) Recall its structure and functions; (3) Eliminate obviously wrong options; (4) Check for common traps (e.g., confusing disaccharides with polysaccharides). Practice time-bound tests to build speed. Review incorrect answers thoroughly to avoid repeating mistakes. Use flashcards for amino acids, monosaccharides, and nucleotide names—these are frequently tested.
Common MCQ Mistakes & How to Avoid Them
Students often confuse (1) dehydration synthesis with hydrolysis; (2) reducing vs non-reducing sugars; (3) nucleotides vs nucleosides; (4) saturated vs unsaturated fats. Remember: dehydration synthesis joins biomolecules (releases water), hydrolysis breaks them (adds water). Reducing sugars have free aldehyde/ketone groups; non-reducing sugars do not. A nucleotide = base + sugar + phosphate; nucleoside = base + sugar only. Review NCERT diagrams repeatedly to prevent these errors in board exams.
Sample MCQ Walkthrough: Application & Step-by-Step Solution
Example: 'Which of the following is NOT a function of proteins?' (A) Enzyme catalysis (B) Energy storage (C) Immune response (D) Structural support. Answer: (B). Proteins' main energy role is metabolic, not primary storage—carbohydrates and lipids store energy. Step 1: Recall protein functions (enzymes, antibodies, hormones, structure, transport). Step 2: Identify the odd one. Step 3: Confirm with NCERT. This walkthrough approach sharpens reasoning and helps you tackle tricky questions confidently.
Board Exam Focus: High-Weightage Topics in Chapter 9
CBSE board exams emphasize: (1) Carbohydrate classification and glycosidic bonds; (2) Protein structure and peptide bonds; (3) Enzyme specificity and lock-and-key model; (4) Lipid structure and energy value; (5) DNA/RNA structure and base pairing. Short-answer questions test definitions and diagrams; long-answer questions explore enzyme regulation and biomolecule interdependence. Dedicate 60–70% of revision time to these high-weightage topics. Practice previous year papers (2020–2024) to understand exact question patterns.
Frequently asked questions
What are the 4 main types of biomolecules in Class 9 Biology?+
The four main biomolecules are carbohydrates (energy & structure), proteins (growth & function), lipids (energy & insulation), and nucleic acids (genetic information). NCERT Chapter 9 details each with examples, functions, and structure.
How many carbon atoms does a simple sugar like glucose have?+
Glucose is a monosaccharide with 6 carbon atoms (C₆H₁₂O₆). It's a hexose sugar and the primary energy source in cells. Other monosaccharides include fructose and galactose, also with 6 carbons.
What is the difference between DNA and RNA?+
DNA contains deoxyribose sugar and thymine; RNA contains ribose sugar and uracil. DNA is double-stranded and stores genetic information; RNA is mostly single-stranded and aids in protein synthesis. Both are nucleic acids made of nucleotides.
Is CBSETUTOR.ai available for free trial or subscription?+
Yes, CBSETUTOR.ai offers flexible subscription plans for CBSE students. Visit our platform to explore free trial options and affordable monthly/yearly packages. All plans include 24/7 AI tutor access, MCQ practice, and doubt-solving for complete chapters.
Does CBSETUTOR.ai support Hindi-medium CBSE students?+
Absolutely! CBSETUTOR.ai is available in both English and Hindi medium, supporting CBSE Classes 6-12. Hindi-medium students get full chapter explanations, MCQs, and doubt-solving in Hindi, ensuring zero language barrier in learning.
How do I prepare for Class 9 Biology Chapter 9 in 2 weeks?+
Week 1: Read NCERT Chapter 9 twice, understand each biomolecule type with diagrams. Week 2: Solve all 30 MCQs daily, review incorrect answers, practice previous year board questions. Use CBSETUTOR.ai's AI tutor for instant help on tough concepts.
Why do enzymes have high specificity for substrates?+
Enzymes have specific active sites shaped complementary to their substrates, following the lock-and-key model. This 3D fit allows only specific substrates to bind and react, ensuring precise metabolic control and preventing unwanted reactions.
Which lipids are healthier—saturated or unsaturated fats?+
Unsaturated fats (found in plant oils) are generally healthier than saturated fats (animal fats) as they lower bad cholesterol. NCERT discusses fat structure; unsaturated fats have one or more double bonds, while saturated fats have only single bonds.
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