Biomolecules are the essential chemical compounds that form the structure of living organisms and perform vital functions in the body. In Class 9 Biology Chapter 6 – Biomolecules, students learn about the different types of biological molecules that are present in cells and how they help in maintaining life.
This chapter explains important biomolecules such as carbohydrates, proteins, lipids, and nucleic acids, which are responsible for energy storage, body structure, growth, and genetic information. Students also learn about the structure and functions of DNA and RNA and how these molecules control the transfer of genetic information in living organisms.
Understanding biomolecules is important because they play a key role in metabolism, cell structure, and biological processes. These notes are prepared according to the Class 9 Biology 2026 new syllabus and include clear explanations to help students understand the concepts easily and prepare effectively for exams.
Class 9 Biology Chapter 6 – Biomolecules MCQs
1. What is the primary function of carbohydrates?
(a) Provide energy ✅
(b) Act as enzymes
(c) Regulate processes
(d) Make membranes
2. Which of the following proteins is involved in oxygen transport?
(a) Insulin
(b) Haemoglobin ✅
(c) Collagen
(d) Keratin
3. Which of the following is NOT a function of proteins?
(a) Transport oxygen in the blood
(b) Carry genetic information ✅
(c) Help in digesting food
(d) Fight against pathogens
4. What is the general formula for carbohydrates?
(a) CnH2nOn ✅
(b) Cn(H2O)n
(c) CH2O
(d) CnHnOn
5. The process of copying DNA into mRNA is called:
(a) Translation
(b) Transcription ✅
(c) Replication
(d) Mutation
Class 9 Biology Chapter 6 – Short Questions
1. What are the main functions of carbohydrates in the body?
Answer:
Carbohydrates provide energy to the body. They are the main source of fuel for all cellular activities. During digestion, carbohydrates are broken down into glucose, which is then used in cellular respiration to produce ATP, the energy currency of the cell. In addition, some carbohydrates also help in storing energy (like glycogen in animals and starch in plants) and play a structural role in certain cell components.
2. What are biomolecules? Name four major types.
Answer:
➤ Biomolecules are molecules produced by living organisms.
➤ They perform essential functions in the body.
➤ The four major types of biomolecules are:
➤ Carbohydrates
➤ Proteins
➤ Lipids
➤ Nucleic Acids
3. What are monosaccharides? Give two examples.
Answer:
➤ Monosaccharides are single sugar molecules.
➤ They are the simplest form of carbohydrates.
Examples:
➤ Glucose
➤ Fructose
4. What is DNA?
Answer:
➤ DNA stands for Deoxyribonucleic Acid.
➤ It is a double-stranded molecule that contains genetic information.
➤ DNA is necessary for the development and functioning of all living organisms.
➤ It is composed of deoxyribonucleotides arranged in a double helix structure.
📥 Download Chapter 6 Notes – Biomolecules
Skip to PDF contentGet complete Class 9 Biology Chapter 6 – Biomolecules notes prepared according to the 2026 new syllabus. These notes are perfect for exam preparation, including:
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Carbohydrates
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Proteins
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Lipids
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Nucleic Acids
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Working of DNA and RNA
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Important MCQs, Short Questions & Long Questions
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