Class 11 Biology

Explore the diversity of living organisms, understand biodiversity, learn about nomenclature, taxonomy, systematics, and the complete taxonomic hierarchy from species to kingdom.

Study the evolution of biological classification from Aristotle to Whittaker's Five Kingdom system, and explore Kingdoms Monera, Protista and Fungi in detail, along with viruses, viroids, prions and lichens.

Explore the five major groups of Kingdom Plantae — Algae, Bryophytes, Pteridophytes, Gymnosperms and Angiosperms — their characteristics, reproduction, classification, and evolutionary significance.

Study the classification of the Animal Kingdom based on fundamental features like levels of organisation, symmetry, germ layers, coelom, segmentation and notochord. Explore all major phyla from Porifera to Chordata, and learn about the diverse classes of vertebrates from jawless fishes to mammals.

Study the external structure (morphology) of flowering plants — roots, stems, leaves, inflorescences, flowers, fruits and seeds. Learn technical terms for plant parts, understand different types of root systems, leaf arrangements, flower symmetry, placentation and seed structure, and explore the Solanaceae family.

Explore the internal structure of flowering plants — the three tissue systems (epidermal, ground and vascular), the organisation of tissues in dicot and monocot roots, stems and leaves, and the key anatomical differences between monocotyledons and dicotyledons.

Study the hierarchy from cells to organ systems, and explore the complete morphology and anatomy of the frog — its digestive, respiratory, circulatory, excretory, nervous and reproductive systems — as a representative vertebrate.

Discover how the cell was identified as the fundamental unit of all life, explore the structure of prokaryotic and eukaryotic cells, and study every major organelle — from the plasma membrane and endomembrane system to mitochondria, plastids, the cytoskeleton and the nucleus with its chromosomes.

Explore the chemical composition of living organisms — from the elements that make up cells to the small building blocks (amino acids, lipids, nucleotides) and the giant macromolecules (proteins, polysaccharides, nucleic acids) they assemble into. Understand the four levels of protein architecture and discover how enzymes catalyse reactions at astonishing speeds.

Understand how cells reproduce through the coordinated events of the cell cycle, explore the stages of mitosis and meiosis, and learn why these divisions are essential for growth, repair and sexual reproduction.

How green plants convert light energy into chemical energy — from the landmark experiments that uncovered photosynthesis to the molecular machinery of light reactions, the Calvin cycle, C4 adaptations, photorespiration, and the environmental factors that control the rate of this life-sustaining process.

How plant cells break down organic molecules to release energy — from the universal first step of glycolysis through anaerobic fermentation, the Krebs' cycle, the electron transport chain and oxidative phosphorylation, to the 38-ATP balance sheet, the amphibolic nature of the pathway, and the respiratory quotient.

How plants grow without limit, differentiate into specialised tissues, and coordinate development through five powerful chemical messengers — auxins, gibberellins, cytokinins, ethylene and abscisic acid.

How the human respiratory system draws in oxygen and expels carbon dioxide — from the anatomy of airways and alveoli, through the mechanics of breathing and pressure-driven gas exchange, to haemoglobin-mediated transport and neural regulation of the entire process.

What blood and lymph are made of, how the ABO and Rh systems classify blood, the step-by-step clotting cascade, how the four-chambered human heart pumps blood through two separate loops (pulmonary and systemic), and how neural and hormonal controls keep the whole system running at the right pace.

How animals dispose of toxic nitrogenous waste — the three excretion strategies (ammonotelism, ureotelism, uricotelism), the anatomy of the human urinary system from kidney zones to the nephron, the three-step process of urine formation, how the counter current mechanism concentrates urine four-fold, hormonal regulation of kidney function via ADH and the renin-angiotensin system, micturition, the excretory roles of lungs, liver and skin, and major kidney disorders including uremia, hemodialysis and transplantation.

How the human body moves — the three types of cellular movement (amoeboid, ciliary, muscular), the structure and contraction mechanism of skeletal muscle, the 206-bone skeletal framework (axial and appendicular), types of joints, and common musculoskeletal disorders.

How the neural system coordinates every organ in the body — the organisation of the human neural system (CNS and PNS), the structure of a neuron, generation and conduction of nerve impulses, synaptic transmission, and the anatomy and functions of the human brain (forebrain, midbrain and hindbrain).

How hormones provide chemical coordination alongside the neural system — endocrine glands, the hypothalamus-pituitary axis, thyroid, parathyroid, adrenal, pancreas, gonads, hormones from non-endocrine organs, and the mechanisms through which hormones act on target cells.