BIOLOGY: CONTENTS OF CLASS XI SYLLABUS
UNIT I: Diversity in Living World
• What is living? ; Biodiversity; Need for classification; Three domains of life; Taxonomy & Systematics;
Concept of species and taxonomical hierarchy; Binomial nomenclature; Tools for study of Taxonomy –
Museums, Zoos, Herbaria, Botanical gardens.
• Five kingdom classification; salient features and classification of Monera; Protista and Fungi into major
groups; Lichens; Viruses and Viroids.
• Salient features and classification of plants into major groups-Algae, Bryophytes, Pteridophytes,
Gymnosperms and Angiosperms (three to five salient and distinguishing features and at least two
examples of each category); Angiosperms classification up to class, characteristic features and
examples).
• Salient features and classification of animals-nonchordate up to phyla level and chordate up to classes
level (three to five salient features and at least two examples).
UNIT II: Structural Organisation in Animals and Plants
• Morphology and modifications; Tissues; Anatomy and functions of different parts of flowering plants:
Root, stem, leaf, inflorescence- cymose and recemose, flower, fruit and seed (To be dealt along with
the relevant practical of the Practical Syllabus).
• Animal tissues; Morphology, anatomy and functions of different systems (digestive, circulatory,
respiratory, nervous and reproductive) of an insect (cockroach). (Brief account only)
UNIT III: Cell Structure and Function
• Cell theory and cell as the basic unit of life; Structure of prokaryotic and eukaryotic cell; 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, micro bodies; Cytoskeleton, cilia, flagella, centrioles (ultra structure and function);
Nucleus-nuclear membrane, chromatin, nucleolus.
• Chemical constituents of living cells: Biomolecules-structure and function of proteins, carbodydrates,
lipids, nucleic acids; Enzymes-types, properties, enzyme action.
• B Cell division: Cell cycle, mitosis, meiosis and their significance.
UNIT IV: Plant Physiology
• 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 (brief
mention).
• 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.
• Photosynthesis: Photosynthesis as a means of Autotrophic nutrition; Site of photosynthesis take place;
pigments involved in Photosynthesis (Elementary
idea); Photochemical and biosynthetic phases ofphotosynthesis; Cyclic and non cyclic and photophosphorylation; Chemiosmotic hypothesis; Photorespiration C3 and C4 pathways; Factors affecting photosynthesis.
• Respiration: Exchange gases; Cellular respiration-glycolysis, fermentation (anaerobic), TCA cycle and
electron transport system (aerobic); Energy relations- Number of ATP molecules generated; Amphibolic pathways; Respiratory quotient.
• Plant growth and development: Seed germination; Phases of Plant growth and plant growth rate;
Conditions of growth; Differentiation, dedifferentiation and redifferentiation; Sequence of
developmental process in a plant cell; Growth regulators auxin,gibberellin, cytokinin, ethylene, ABA;
Seed dormancy; Vernalisation; Photoperiodism.
UNIT V: Human Physiology
• 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 value of proteins, carbohydrates and fats; Egestion; Nutritional and
digestive disorders – PEM, indigestion, constipation, vomiting, jaundice, diarrhea.
• Breathing and Respiration: Respiratory organs in animals (recall only); Respiratory system in humans;
Mechanism of breathing and its regulation in humans-Exchange of gases, transport of gases and
regulation of respiration Respiratory volumes; Disorders related to respiration-Asthma, Emphysema,
Occupational respiratory disorders.
• 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
system-Hypertension, Coronary artery disease, Angina pectoris, Heart failure.
• Excretory products and their elimination: Modes of excretion- Ammonotelism, ureotelism, uricotelism;
Human excretory system-structure and fuction; Urine formation, Osmoregulation; Regulation of kidney
function-Renin-angiotensin, Atrial Natriuretic Factor, ADH and Diabetes insipidus; Role of other organs
in excretion; Disorders; Uraemia, Renal failure, Renal calculi, Nephritis; Dialysis and artificial kidney.
• Locomotion and Movement: Types of movement- ciliary, fiagellar, muscular; Skeletal musclecontractile proteins and muscle contraction; Skeletal system and its functions (To be dealt with the
relevant practical of Practical syllabus); Joints; Disorders of muscular and skeletal system-Myasthenia
gravis, Tetany, Muscular dystrophy, Arthritis, Osteoporosis, Gout.
• Neural control and coordination: Neuron and nerves; Nervous system in humanscentral nervous
system, peripheral nervous system and visceral nervous system; Generation and conduction of nerve
impulse; Reflex action; Sense organs; Elementary structure and function of eye and ear.
• Chemical coordination and regulation: Endocrine glands and hormones; Human endocrine systemHypothalamus, 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 (Common disorders e.g. Dwarfism, Acromegaly, Cretinism, goiter, exopthalmic goiter, diabetes, Addison’s disease).
(
Imp: Diseases and disorders mentioned above to be dealt in brief.
)
BIOLOGY: CONTENTS OF CLASS XII SYLLABUS
UNIT I: Reproduction
• Reproduction in organisms: Reproduction, a characteristic feature of all organisms for continuation of
species; Modes of reproduction – Asexual and sexual; Asexual reproduction; Modes-Binary fission,
sporulation, budding, gemmule, fragmentation; vegetative propagation in plants.
• Sexual reproduction in flowering plants: Flower structure; Development of male and female
gametophytes; Pollination-types, agencies and examples; Outbreeding devices; Pollen-Pistil
interaction; Double fertilization; Post fertilization events- Development of endosperm and embryo,
Development of seed and formation of fruit; Special modes-apomixis, parthenocarpy, polyembryony;
Significance of seed and fruit formation.
• Human Reproduction: Male and female reproductive systems; Microscopic anatomy of testis and ovary;
Gametogenesis-spermatogenesis & oogenesis; Menstrual cycle; Fertilisation, embryo development
upto blastocyst formation, implantation; Pregnancy and placenta formation (Elementary idea);
Parturition (Elementary idea); Lactation (Elementary idea).
• Reproductive health: Need for reproductive health and prevention of sexually transmitted diseases
(STD); Birth control-Need and Methods, Contraception and Medical Termination of Pregnancy (MTP);
Amniocentesis; Infertility and assisted reproductive technologies – IVF, ZIFT, GIFT (Elementary idea for
general awareness).
UNIT II: Genetics and Evolution
• Heredity and variation: Mendelian Inheritance; Deviations from Mendelism- Incomplete dominance,
Co-dominance, Multiple alleles and Inheritance of blood groups, Pleiotropy; Elementary idea of
polygenic inheritance; Chromosome theory of inheritance; Chromosomes and genes; Sex
determination-In humans, birds, honey bee; Linkage and crossing over; Sex linked inheritance Haemophilia, Colourblindness; Mendelian disorders in humans Thalassemia; Chromosomal disorders
in humans; Down’s syndrome, Turner’s and Klinefelter’s syndromes.
• Molecular basis of Inheritance: Search for genetic material and DNA as genetic material; Structure of
DNA and RNA; DNA packaging; DNA replication; Central dogma; Transcription, genetic code, translation;
Gene expression and regulation- Lac Operon; Genome and human genome project; DNA finger printing.
• Evolution: Origin of life; Biological evolution and evidences for biological evolution from Paleontology, comparative anatomy, embryology and molecular evidence); Darwin’s contribution, Modern Synthetic
theory of Evolution; Mechanism of evolution-Variation (Mutation and Recombination) and Natural
Selection with examples, types of natural selection; Gene flow and genetic drift; Hardy-Weinberg’s
principle; Adaptive Radiation; Human evolution.
UNIT III: Biology and Human Welfare
• Health and Disease; Pathogens; parasites causing human diseases (Malaria, Filariasis, Ascariasis.
Typhoid, Pneumonia, common cold, amoebiasis, ring worm); Basic concepts of immunology-vaccines;
Cancer, HIV and AIDS; Adolescence, drug and alcohol abuse.
• Improvement in food production; Plant breeding, tissue culture, single cell protein, Biofortification;
Apiculture and Animal husbandry.
• Microbes in human welfare: In household food processing, industrial production, sewage treatment,
energy generation and as biocontrol agents and biofertilizers.
UNIT IV: Biotechnology and Its Applications
• Principles and process of Biotechnology: Genetic engineering (Recombinant DNA technology).
• Application of Biotechnology in health and agriculture: Human insulin and vaccine production, gene
therapy; Genetically modified organisms-Bt crops; Transgenic Animals; Biosafety issues-Biopiracy and
patents.
UNIT V: Ecology and environment
• Organisms and environment: Habitat and niche; Population and ecological adaptations; Population
interactions-mutualism, competition, predation, parasitism; Population attributes-growth, birth rate
and death rate, age distribution.
• Ecosystem: Patterns, components; productivity and decomposition; Energy flow; Pyramids of number,
biomass, energy; Nutrient cycling (carbon and phosphorous); Ecological succession; Ecological Services Carbon fixation, pollination, oxygen release.
• Biodiversity and its conservation: Concept of Biodiversity; Patterns of Biodiversity; Importance of
Biodiversity; Loss of Biodiversity; Biodiversity conservation; Hotspots, endangered organisms,
extinction, Red Data Book, biosphere reserves, National parks and sanctuaries.
• Environmental issues: Air pollution and its control; Water pollution and its control; Agrochemicals and
their effects; Solid waste management; Radioactive waste management; Greenhouse effect and global
warning; Ozone depletion; Deforestation; Any three case studies as success stories addressing
environmental
issues.
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