CBSE Class 11 Biology Revision Notes

Introduction to CBSE Exam

The Central Board of Secondary Education is a national level board of education managed by the Government of India. It is one of the most reputed and preferred boards in the country, overseeing the most important exams in a students life, primarily class 10 and class 12 board exams.

The CBSE envisions absolute development of the student both mentally and physically and also aims to make the students more vivacious. 

CBSE Class 11 Biology Notes

Biology is a subject with numerous concepts and processes to memorise. To master Biology, students need to revise the concepts regularly and consistently. Extramarks provides students CBSE class 11 Biology notes to help them in their revision. The class 11 Biology notes include different chapter topics, well researched by subject matter experts written in an easy to understand format to permit stress-free revisions. The CBSE revision notes contain well-labelled drawings related to different topics along with questions from the NCERT books, CBSE sample papers and CBSE previous year question papers. These notes cover topics and questions recently introduced in the latest CBSE syllabus.

Chapter-Wise CBSE Class 11 Biology Notes  

The CBSE class 11 Biology notes curated by Extramarks contain a concise summary of all chapters, well-labelled diagrams and different levels of questions to prepare the students for their CBSE board exams. The CBSE class 11 Biology notes are made in accordance with the study material presented in the NCERT books to guarantee effective and quick revision. 

UNIT 1- Diversity in the living world.

The first unit helps in introducing students to the basics of Biology and the beauty of the living world. It consists of four chapters namely, The Living World, Biological Classification, Plant Kingdom and Animal Kingdom. The Plant Kingdom and Animal Kingdom are of utmost importance and tend to carry a lot of weight. The first unit forms the base of Biology and is integral in understanding the other units. 

  • Chapter-1 The Living World
  • Chapter-2  Biological Classification
  • Chapter-3 The Animal Kingdom
  • Chapter-4  The Plant Kingdom

UNIT 2- Structural Organisation in Plants and Animals

The second unit sheds light on the structural classification of plants and animals. It includes a total of three chapters namely, Morphology of Flowering Plants, Anatomy of Flowering Plants and Structural Organisation in Animals. The unit explains the structure and anatomy of flowering plants and includes topics that explain the importance of different anatomical parts varying from root, seed, leaf and so on to topics like the meristems, angiosperms, and different tissues in plants. It also sheds light on the cell structure of animals and the types of tissues present in them. 

  • Chapter-5 Morphology of Flowering Plants
  • Chapter-6 Anatomy of Flowering Plants
  • Chapter-7 Structural Organization in Animals

UNIT 3- Cell: Structure and Functions

The third unit dives into the cell, the basic unit of life. It explains the different functions of a cell and also the parts that constitute a cell. The unit includes a total of three chapters namely Cell: The unit of life, Biomolecules and Cell Cycle and Cell Division. The unit also introduces biomolecules, their types and the different significance they have in the cell. It explains the cell cycle and cell division and its phases in a detailed manner for both mitosis and meiosis. The CBSE class 11 Biology notes for this unit contain well labelled and beautifully drawn diagrams for the different processes so the students can refer to the notes to understand the concepts  easily. 

  • Chapter-8 Cell: The unit of life
  • Chapter-9 Biomolecules
  • Chapter-10 Cell Cycle and Cell Division

UNIT 4- Plant Physiology

The fourth unit of class 11 Biology primarily focuses on the physiology of plants and explains the different processes taking place in the plant body. It includes topics like transport of water and minerals in plants, photosynthesis and respiration in plants. The unit includes a total of five chapters namely, Transport in plants, Mineral Nutrition, Photosynthesis in Higher Plants, Respiration in Plants and Plant Growth and Development. Students can find the CBSE class 11 Biology notes for the unit from the links given below. The CBSE class 11 Biology notes contain easy to understand interpretations of the processes along with well-drawn and labelled diagrams to aid in preparation. 

  • Chapter-11 Transport in Plants
  • Chapter-12 Mineral Nutrition
  • Chapter-13 Photosynthesis in Higher Plants
  • Chapter-14 Respiration in Plants
  • Chapter-15 Plant growth and development

UNIT 5- Human Physiology

The fifth unit of CBSE class 11 Biology is pertaining to the human body and all the processes taking place in it along with an introduction to all the organs involved in the process. It explains all the essential processes like digestion and absorption, locomotion, excretion and so on. There are a total of seven chapters in the unit namely, 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. The CBSE class 11 Biology notes for this unit contain all the processes explained along with well-labelled diagrams.

  • Chapter-16 Digestion and Absorption
  • Chapter-17 Breathing and Exchange of gases
  • Chapter-18 Body Fluids and Circulation
  • Chapter-19 Excretory products and Elimination
  • Chapter-20 Locomotion and Movement
  • Chapter-21 Neural Control and Coordination
  • Chapter-22 Chemical coordination and Integration. 

CBSE Class 11 Biology –  Distribution of Marks 

  • 70 marks- Term exams conducted by school
  • 30 marks-Practical exams at school

How Can Extramarks Help Students for Class 11 Biology?

Extramarks is one of the most reliable sources for Biology preparation. Extramarks provides students with NCERT Biology class 11 notes, CBSE extra questions for each chapter, video lectures to refer to. The CBSE class 11 Biology notes covers every topic stated in the NCERT syllabus. The notes also contain well-labelled diagrams that candidates can refer to and practice to boost their preparation and subsequently score well in their exam. 

FAQs (Frequently Asked Questions)

1. Are these notes sufficient enough for Biology preparation?

The CBSE class 11 Biology notes have been prepared by subject matter experts keeping in mind the understanding of each student. These notes have been designed thoroughly in consideration with the NCERT syllabus and are easy to read and understand. They also contain questions, summaries, diagrams to enhance the student’s preparation

2. Which is the best book for class 11 Biology?

According to our experts, the NCERT textbook for class 11 Biology is more than sufficient for Biology preparation. The NCERT contains all the concepts explained well with diagrams to complement the explanation. Students can also refer to the CBSE class 11 Biology notes to support their preparation.