NCERT Solutions for Class 11 Biology Chapter 9 - Biomolecules


NCERT Solutions for Class 11 Biology Chapter 9 - Biomolecules: There is a wide diversity in living organisms in our biosphere. Now a question that arises in our minds is: Are all living organisms made of the same chemicals, i.e., elements and compounds? You have learned in chemistry how elemental analysis is performed. If we perform such an analysis on plant tissue, animal tissue or a microbial paste, we obtain a list of elements like carbon, hydrogen, oxygen and several others and their respective content per unit mass of living tissue. Chapter 9 - Biomolecules, will tell you that, what type of organic compounds are found in living organisms? How does one go about finding the answer? To get an answer, one has to perform a chemical analysis. With the help of NCERT solutions, you will get the answer of all the questions.

A closer examination reveals that the relative abundance of carbon, hydrogen, and oxygen is higher in living systems when compared to inanimate matter. The most abundant chemical in living organisms is water.

Here are the important topics of NCERT Class 11 Biology Chapter 9 - Biomolecules mentioned below:

9.1 How to Analyse Chemical Composition?

9.2 Primary and Secondary Metabolites

9.3 Biomacromolecules

9.4 Proteins

9.5 Polysaccharides

9.6 Nucleic Acids

9.7 Structure of Proteins

9.8 Nature of Bond Linking Monomers in a Polymer

9.9 Dynamic State of Body Constituents - Concept of Metabolism

9.10 Metabolic Basis for Living

9.11 The Living State

9.12 Enzymes

  • 9.12.1 Chemical Reactions
  • 9.12.2 How do Enzymes bring about such High Rates of Chemical Conversions?
  • 9.12.3 Nature of Enzyme Action
  • 9.12.4 Factors Affecting Enzyme Activity
  • 9.12.5 Classification and Nomenclature of Enzymes
  • 9.12.6 Co-factors

There are three types of macromolecules, i.e., proteins, nucleic acids, and polysaccharides are found in living systems. Lipids, because of their association with membranes separate in the macromolecular fraction. Biomacromolecules are polymers. They are made of building blocks which are different. Proteins are heteropolymers made of amino acids. Nucleic acids (RNA and DNA) are composed of nucleotides.

Biomacromolecules have a hierarchy of structures:

  • primary
  • secondary
  • tertiary and
  • quaternary

Nucleic acids serve as genetic material. Polysaccharides are components of the cell wall in plants, fungi and also of the exoskeleton of arthropods. They also are storage forms of energy (e.g., starch and glycogen). Proteins serve a variety of cellular functions. Many of them are enzymes, some are antibodies, some are receptors, some are hormones and some others are structural proteins. Collagen is the most abundant protein in the animal world and Ribulose bisphosphate Carboxylase-Oxygenase (RuBisCO) is the most abundant protein in the whole of the biosphere.

Go through Class 11 NCERT Biology Chapter 9 - Biomolecules line by line, after that you must be able to answer the questions which are given below:

  • Q1. Explain the composition of triglyceride.
  • Q2. Can you describe what happens when milk is converted into curd or yogurt, from your understanding of proteins?
  • Q3. What are gums made of? Is Fevicol different?

If you have any query or any doubt in solving these questions, then NCERT Solutions for Class 11 Biology Chapter 9 - Biomolecules will help you in answering these questions by understanding the concept behind the questions.

NCERT solutions for Class 11 Biology Chapter 9 Biomolecules - Solved Exercise Questions

Also try to attempt all the questions mentioned in NCERT Class 11 Biology Chapter 9 - Biomolecules, as it will help you in clearing your base. If you face any problem, then NCERT solutions for class 11 Biology will help you out.

NCERT Solutions for class 11 Biology


The Living World


Biological Classification


Plant Kingdom

Chapter- 4

Animal Kingdom


Morphology of Flowering Plants


Anatomy of Flowering Plants


Structural Organisation in Animals


Cell: The Unit of Life


Cell Cycle and Cell Division


Transport in Plants


Mineral Nutrition


Photosynthesis in Higher Plants


Respiration in Plants


Plant Growth and Development


Digestion and Absorption


Breathing and Exchange of Gases


Body Fluids and Circulation


Excretory Products and their Elimination


Locomotion and Movement


Neural Control and Coordination


Chemical Coordination and Integration

NCERT Solutions for Class 11- Subject wise

NCERT solutions for Class 11 Biology

NCERT solutions for Class 11 Maths

NCERT solutions for Class 11 Chemistry

NCERT solutions for Class 11 Physics


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