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Free study notes for CBSE & ICSE, Classes 6–12.

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BiologyClass 12ICSE

How a Single Fertilised Egg Implants and Grows Into a Baby

Study the male and female reproductive systems with the structure of the testis and ovary, spermatogenesis and oogenesis with their hormonal control, the menstrual and oestrous cycles, and fertilisation through implantation, placenta formation, parturition and lactation.

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BiologyClass 12ICSE

Why Every Flowering Plant Needs Two Fertilisations to Make One Seed

Understand double fertilisation and triple fusion, the development of endosperm, embryo, seed and fruit, the difference between albuminous and non-albuminous seeds and true and false fruits, and apomixis, parthenocarpy, polyembryony and dispersal.

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BiologyClass 12ICSE

How a Single Pollen Grain Carries What a Flower Needs to Make a Seed

Learn the structure of the microsporangium and development of pollen grains, the megasporangium and formation of the embryo sac, types of pollination with adaptations for wind, water and insects, and how artificial hybridisation is done.

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BiologyClass 11ICSE

How a Pea-Sized Gland Under the Brain Controls So Many Others

Locate the major human endocrine glands and the controlling role of the hypothalamus and pituitary, learn the hormones of the thyroid, parathyroid, adrenal, pancreas, gut and gonads, how hormones act and are regulated by feedback, and the disorders caused by too much or too little hormone.

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BiologyClass 11ICSE

How a Signal Races From Your Fingertip to Your Brain in a Split Second

Classify neurons and follow how a nerve impulse is generated and conducted, learn the organisation of the human nervous system and the parts of the brain and spinal cord, and see how impulses travel along myelinated fibres and across synapses.

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BiologyClass 11ICSE

How Tiny Protein Filaments Slide Past Each Other to Lift Your Arm

Learn the types of movement and the human skeleton, the structure of skeletal muscle and the sliding filament theory, the types of joints, and disorders of the muscular and skeletal systems.

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BiologyClass 11ICSE

How Your Kidneys Filter About 180 Litres of Fluid a Day

Compare ammonotelic, ureotelic and uricotelic animals, learn the human excretory system and nephron, the steps of urine formation and the counter-current mechanism, hormonal control of the kidney, other excretory organs, and kidney disorders with dialysis and transplantation.

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BiologyClass 11ICSE

How Your Heart Keeps Beating Without Being Told To

Explore the structure of the human heart and blood vessels, the cardiac cycle with stroke volume, cardiac output and the ECG, double circulation and the regulation of heartbeat and blood pressure, and disorders of the circulatory system.

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BiologyClass 11ICSE

Why O Negative Blood Is Kept Ready for Emergencies

Learn what blood plasma contains and what red cells, white cells and platelets do, how the ABO and Rh systems govern transfusion and pregnancy, and the composition and roles of lymph and the lymphatic system.

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BiologyClass 11ICSE

Why You Breathe Faster When Carbon Dioxide Rises, Not When Oxygen Falls

Learn the human respiratory system and how gases are exchanged in the alveoli, how oxygen and carbon dioxide travel in blood, respiratory volumes, capacities and the control of breathing, and disorders of the respiratory system.

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BiologyClass 11ICSE

Why Mangrove Seeds Germinate While Still Hanging on the Tree

Learn hypogeal, epigeal and viviparous germination, differentiation, dedifferentiation and redifferentiation, the phases of growth and ways to measure growth rate, and the sources, roles and uses of plant growth regulators.

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BiologyClass 11ICSE

How a Plant Cell Squeezes Energy Out of a Single Glucose Molecule

Learn the types of respiration and the steps of glycolysis, the Krebs cycle and electron transport system with ATP yield, fermentation, oxidative phosphorylation and amphibolic pathways, and how to calculate respiratory quotients.

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BiologyClass 11ICSE

Why Maize and Sugarcane Beat Wheat on a Hot, Bright Day

Follow the Calvin cycle step by step, understand Kranz anatomy and the C4 pathway, compare C3 and C4 plants, explain photorespiration and the dual role of RuBisCO, and apply Blackman's law of limiting factors.

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BiologyClass 11ICSE

Why Leaves Look Green When Chlorophyll Absorbs Red and Blue Light

Understand photosynthetic pigments and the difference between absorption and action spectra, the light reactions with photosystems I and II and cyclic and non-cyclic photophosphorylation, and how chemiosmosis makes ATP in chloroplasts.

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BiologyClass 11ICSE

How One Cell Becomes Two Without Losing a Single Chromosome

Learn the phases of the cell cycle, the stages and significance of mitosis and meiosis, and the key differences between the two kinds of cell division.

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BiologyClass 11ICSE

Why an Egg White Turns Solid When You Cook It

Classify carbohydrates from monosaccharides to polysaccharides, understand amino acids and the four levels of protein structure, classify lipids and describe fats and oils, and learn how enzymes are classified, what cofactors do and what affects enzyme activity.

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BiologyClass 11ICSE

Why Every Cell Runs Like a Tiny Factory With Its Own Power Stations

Explore the nucleus, mitochondria and plastids, the endomembrane system, ribosomes and microbodies, the cytoskeleton, cilia, flagella and centrioles, and the key differences between prokaryotic and eukaryotic cells and between plant and animal cells.

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BiologyClass 11ICSE

How a Thin, Oily Film Decides What Enters Every Cell

Learn the cell theory and the general plan of a eukaryotic cell, the structure of the plant cell wall with plasmodesmata, the fluid mosaic model of the plasma membrane, and how passive transport, facilitated diffusion and active transport differ.

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BiologyClass 11ICSE

How a Frog Breathes Through Its Skin as Well as Its Lungs

Study the digestive, circulatory and respiratory systems of the frog, its excretory, nervous and reproductive systems, and how the frog's organ systems reflect the basic vertebrate body plan.

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BiologyClass 11ICSE

What the Inside of a Stem Reveals About Whether a Plant Is a Monocot

Classify meristems by origin and position, describe simple and complex permanent tissues and their functions, and compare the internal structure of dicot and monocot roots, stems and leaves as seen in labelled sections.

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BiologyClass 11ICSE

Why a Sunflower Is Really Hundreds of Tiny Flowers

Understand the parts of a typical flower, floral symmetry and aestivation, types of placentation, cohesion and adhesion in stamens and carpels, and the differences between racemose and cymose inflorescences.

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BiologyClass 11ICSE

How a Pitcher Plant Turns a Leaf Into a Trap

Classify roots and their modifications for storage, breathing and support, recognise underground, sub-aerial and aerial stem modifications, and understand leaf parts, venation, phyllotaxy and leaf modifications including insectivorous plants.

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BiologyClass 11ICSE

What a Tiny Sea Squirt Larva Reveals About Your Own Backbone

Tell chordates from non-chordates by the notochord, meet the protochordates Urochordata and Cephalochordata, learn the seven vertebrate classes with examples, and compare the adaptations of aquatic, amphibious and terrestrial vertebrates.

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BiologyClass 11ICSE

Why a Sponge, a Jellyfish and an Earthworm Are Built So Differently

Learn how levels of organisation, body plans, symmetry, germ layers and body cavities are used to classify animals, and the key features and examples of ten non-chordate phyla from Porifera to Hemichordata.

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