NCERT Solutions for Class 11 Biology Chapter 9 – Biomolecules


With the help of NCERT solutions for Class 11 Biology Chapter 9, the students understand the concept of the chemical composition of matter found in living entities. These solutions are created for all the questions available in the NCERT textbook & designed in the same order for the convenience of students.

Class 11 Biology Chapter 9 NCERT solutions are crafted by the best subject teachers.

NCERT Solutions for Class 11 Biology Chapter 9 – Biomolecules

CBSE Class 11 Biology Chapter 9 NCERT solutions are provided in a detailed manner so that the students can easily understand the concepts with diagrams. The solutions enable the students to understand the syllabus and also raise their confidence of solving any question. The students can easily download NCERT solutions for Class 11 Biology Chapter 9 pdf & prepare well for the exams.

You can download CBSE NCERT Solutions for Class 11 Biology Chapter 9 from below.

Download NCERT Class 11 Biology Chapter 9 Solutions

What will you learn in NCERT Class 11 Biology Chapter 9?

In Chapter 9 – Biomolecules, the students will learn important topics about the chemical composition. The students will be able to analyze a living tissue sample and identify a specific organic compound in higher classes, a fundamental understanding of different types of tissues, anatomy, morphology, the common site where they are found, distinct functionalities they carry out, & more are equally needed to understand concepts.

Class 11 Biology Chapter 9 solutions enables the students to understand different chemical reactions and their conversions, role of enzymes, nature of different enzyme actions, various factors affecting the activity of enzymes, the classification and nomenclature of different enzymes.

All the carbon compounds that we get from living tissues can be called ‘biomolecules’, is a simple definition of biomolecules. Along with this, students shall learn How to Analyse Chemical Composition? Primary and Secondary Metabolites, Biomacromolecules, Proteins, Polysaccharides, Nucleic Acids, Structure of Proteins, Nature of Bond Linking Monomers in a Polymer, Dynamic State of Body Constituents – Concept of Metabolism, Metabolic Basis for Living, The Living State and Enzymes.

While learning about Enzymes; students will also be able to know Chemical Reactions, How do Enzymes bring about such High Rates of Chemical Conversions? Nature of Enzyme Action, Factors Affecting Enzyme Activity, Classification and Nomenclature of Enzymes and Co-factors. Although there is a bewildering diversity of living organisms, their chemical composition and metabolic reactions appear to be remarkably similar. This similarity can be easily drawn through in-depth study of NCERT Grade 11 Chapter 9, Biomolecules.

Class 11 Biology Chapter 9 solutions assist the students to easily complete their assignments on time. These solutions also help in the quick, last-minute revision of the chapter during any test & final exams. NCERT Solutions for Class 11 Biology Chapter 9 pdf is a easy preparation tool that enables the students to easily understand the concept and score good marks.

CBSE Class 11 Biology Chapter 9 Solutions cover the following exercises:

  • Exercise 9.1 – How to analyze chemical composition?
  • Exercise 9.2 – Primary And Secondary Metabolites
  • Exercise 9.3 – Biomacromolecules
  • Exercise 9.4 – Proteins
  • Exercise 9.5 – Polysaccharides
  • Exercise 9.6 – Nucleic Acids
  • Exercise 9.7 – Structure Of Proteins
  • Exercise 9.8 – Nature Of Bond Linking Monomers In A Polymer
  • Exercise 9.9 – Dynamic State Of Body Constituents – Concept Of Metabolism
  • Exercise 9.10 – Metabolic Basis For Living
  • Exercise 9.11 – The Living State
  • Exercise 9.12 – Enzymes

Benefits of Solutions Class 11 Biology Chapter 9 – Biomolecules

  • CBSE Class 11 Biology Chapter 9 solutions are crafted by subject matter experts
  • The solutions are provided according to the expected answering pattern & easy to understand
  • Class 11 Biology Chapter 9 solutions pdf download can be easily accessible & help the students to score good marks.

Important Notes On Biomolecules

  • 1. Polysaccharides: These are long chain of polymers of monosaccharides.
  • 2. Starch: Store house of energy in plant tissues. Forms helical secondary structures, made of only glucose monomers.
  • 3. Cellulose: Homopolymer of glucose. It does not certain complex helices. Cotton fible is cellulose.
  • 4. Glycogen: Is a branched homopolymer, found as storage polysaccharide in animals.
  • 5. Inulin: Is a polymer of fructose.
  • 6. Chitin: Chemically modified sugar (amino-sugars) N-acetyl galactosamine form exoskeleton of arthropods; heterpolymer.


  • 1. Watson and Crick Model: DNA is a right handed, double helix of two polynucleotide chains, having a major and minor groove. The two chains are antiparallel, and held together by hydrogen bonds (two between A and T and three between C and G). The backbone is formed by sugar-phosphatesugar chain.
  • 2. The nitrogen bases are projected more or less perpendicular to this, backbone and face inside. The pitch is 34A°. At each step of ascent, the strand turns 36°. The rise per base pair is 3.4°A, so one full turn involves ten base pairs.


  • 1. Water insoluble, containing C, H, O.
  • 2. Fats on hydrolysis yield fatty acids.
  • 3. Fatty acid has a carboxyl group attached to an R group (contains 1 to 19 carbons).
  • 4. Fatty Acids: Saturated: With single bonds in carbon chain, e.g., Palmitic acid, butyric acid.
  • 5. Unsaturated: With one or more double bonds, e.g., oleic acid, linoleic acid.


  • 1. Peptide bond-formed between the carboxyl (-COOH) group of one amino acid, and the amino (- NH2) group of the next amino with the elimination of water moiety, (dehydration).
  • 2. Glycosidic bond-bond formed between two carbon atoms of two adjacent monosaccharides., by dehydration.
  • 3. Phosphodiester bond-bond formed in nucleic acids where in a phosphate moiety links the 3-carbon of one sugar of one nucleotide to the 5-carbon of the sugar of the succeeding nucleotide. (The bond between phosphate group and hydroxyl group of sugar).


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