Download CBSE Class 11 Biology Notes for 2021-22

Biology is very integral part of overall Class 11th Studies and has lot of concepts and if one looks to attain high score, it becomes imperative to have clear understanding of those fundamentals.Here on Ribblu.com you will find the most comprehensive Class 11 Biology Notes along with important Question answers and tips. Every Biology chapter covered below covers notes for school exams, CBSE board exams and even Olympiads.Check the links given below for more information about each chapter given in the class 11 Biology syllabus

CBSE Class 11 Biology Notes - Comprehensive & Detailed

For Preparation of exams students can also check out other resource material

CBSE Class 11 Biology Sample Papers

CBSE Class 11 Biology Worksheets

CBSE Class 11 Biology Test Papers

CBSE Class 11 Biology Important Questions

CBSE Class 11 Biology Question Papers

Revision Notes of Other Subjects of Class 11

CBSE Revision Notes of Class 11 Physics

CBSE Revision Notes of Class 11 Chemistry

Unit–I Diversity of Living Organisms

Chapter–1 : The Living World
What is living ? Biodiversity; Need for for classification; three domains of life : taxonomy and systematics; concept of species and taxonomic hierarchy; binomial nomenclature; tools for study of taxonomy-museum, zoological parks, herbaria, botanical gardens.

Chapter–2 : Biological Classification
Five kingdom classification; Salient features and classification of Monera, Protista and Fungi into major groups; Lichens,Viruses and Viroids.

Chapter–3 : Plant Kingdom
Salient features and classification of plants into major groups – Algae, Bryophyta, Pteridophyta, Gymnosperms and Angiosperms (three to ve salient and distinguishing features and at least two examples of each category); Angiosperms –classification upto class , characteristic features and examples.

Chapter–4 : Animal Kingdom
Salient features and classification of animals non-chordates up to phyla level and chordates up to class level (three to five salient features and at least two examples of each category).

Unit–II Structural Organisation in Animals and Plants

Chapter–5 : Morphology of Flowering Plants
Morphology and modifications : Tissues

Chapter–6 : Anatomy of Flowering Plants
Anatomy and functions of different parts of flowering plants : root, stem, leaf, inflorescence, flower, fruit and seed (to be dealt along with the relevant experiment of the Practical Syllabus).

Chapter–7 : Structural Organisation in Animals
Animal tissues : Morphology, anatomy and functions of different systems (digestive, circulatory, respiratory, nervous and reproductive) of an insect (cockroach), (a brief account only)

Unit–III Cell : Structure and Function

Chapter–8 : Cell-The Unit of Life
Cell theory and cell as the basic unit of life : Structure of prokaryotic and eukaryotic cells; Plant cell and animal cell; cell envelope; cell membrane, cell wall; cell organelles– structure and function; endomembrane system, endoplasmic reticulum, Golgi bodies, lysosomes, vacuoles; mitochondria, ribosomes, plastids, microbodies; cytoskeleton, cilia, agella, centrioles (ultrastructure and function); nucleus, nuclear membrane, chromatin, nucleolus.

Chapter–9 : Biomolecules
Chemical constituents of living cells : biomolecules, structure and function of proteins, carbohydrates, lipids, nucleic acids, enzymes, types, properties, enzymes action.

Chapter–10 : Cell Cycle and Cell Division
Cell cycle, mitosis, meiosis and their significance.

Unit–IV Plant Physiology

Chapter–11 : Transport in Plants
Movement of water, gases and nutrients; cell to cell transport, Diffusion, facilitated diffusion, active transport; plant-water relations, Imbibition, water potential, osmosis, plasmolysis; long distance transport of water–Absorption, apoplast , symplast , transpiration pull, root pressure and guttation; transpiration, opening and closing of stomata; Uptake and translocation of mineral nutrients– Transport of food, phloem transport, mass flow hypothesis; diffusion of gases.

Chapter–12 : Mineral Nutrition
Essential minerals, macro-and micronutrients and their role; deficiency symptoms; mineral toxicity; elementary idea of hydroponics as a method to study mineral nutrition; nitrogen metabolism, nitrogen cycle, biological nitrogen fixation.

Chapter–13 : Photosynthesis in Higher Plants
Photosynthesis as a mean of autotrophic nutrition; site of photosynthesis, pigments involved in photosynthesis (elementary idea); photochemical and biosynthetic phases of photosynthesis, cyclic and non cyclic photophosphorylation; chemiosmotic hypothesis; photorespiration; C3 and C4 pathways; factors affecting photosynthesis.

Chapter–14 : Respiration in Plants
Exchange of gases; cellular respiration–glycolysis, fermentation (anaerobic), TCA cycle and electron transport system (aerobic); energy relations–number of ATP molecules generated; amphibiotic pathways; respiratory quotient.

Chapter–15 : Plant–Growth and Development
Seed germination; phases of plant growth and plant growth rate; conditions of growth; differentiation, dedifferentiation and redifferentiation;’ sequence of developmental processes in a plant cell; growth regulators–auxin, gibberellin, cytokinin, ethylene, ABA; seed dormancy; vernalisation; photoperiodism.

Unit–V Human Physiology

Chapter–16 : Digestion and Absorption
Alimentary canal and digestive glands, role of digestive enzymes and gastrointestinal hormones; Peristalsis, digestion, absorption and assimilation of proteins, carbohydrates and fats; caloric values of proteins, carbohydrates and fats; egestion; nutritional and digestive disorders–PEM, indigestion, constipation, vomiting, jaundice, diarrhoea.

Chapter–17 : Breathing and Exchange of Gases
Respiratory organs in animals (recall only); Respiratory system in human; mechanism of breathing and its regulation in humans–exchange of gases, transport of gases and regulation of respiration, respiratory volume; disorders related to respiration–asthma, emphysema, occupational respiratory disorders.

Chapter–18 : Body Fluids and Circulation
Composition of blood, blood groups, coagulation of blood; composition of lymph and its function; human circulatory system– structure of human heart and blood vessels; cardiac cycle, cardiac output, ECG; double circulation; regulation of cardiac activity; disorders of circulatory sy em–hypertension, coronary artery disease, angina pectoris, heart failure.

Chapter–19 : Excretory Products and Their Elimination
Modes of excretion–ammonotelism, ureotelism, uricotelism; human excretory system– structure and function; urine formation, osmoregulation of kidney function– renin–angiotensin, atrial natriuretic factor, ADH and diabetes insipidus; role of other organs in excretion;’ disorders– uraemia, renal failure, calculi, nephritis; dialysis and artificial kidney.

Chapter–20 : Locomotion and Movement
Types of movement–Ciliary, agellar, muscular; skeletal muscle–contractile proteins and muscle contraction; skeletal system and its functions; joints; disorders of muscular and skeletal system–myasthenia gravis, tetany, muscular dystrophy, arthritis, osteoporosis, gout.

Chapter–21 : Neural Control and Coordination
Neurons and nerves;Nervous system in humans–central nervous system; peripheral nervous system and visceral nervous system; generation and conduction of nerve impulse; reflex action; sensory perception sense organs elementary structure and functions of eye and ear.

Chapter–22 : Chemical Coordination and Integration
Endocrine glands and hormones; human endocrine system–hypothalamus, pituitary, pineal, thyroid, parathyroid, adrenal, pancreas, gonads; mechanism of hormone action (elementary idea); role of hormones as messengers and regulators, hypo–and hyperactivity and related disorders; dwarfism, acromegaly, cretinism, goitre, exophthalmic goitre, diabetes, Addison’s disease.