Course Outline
Check off chapters as you study them, and take each module's test when you're ready. Everything is saved locally in your browser — nothing is uploaded, no account needed.
A note on these questions
These are practice questions written in NEET-style by the Bryn Flow team, covering the correct NCERT-based syllabus concepts for each chapter — they are not reproduced from official past-year papers. Concept notes are written for exam revision specifically, condensed to the facts and processes that actually get tested, closely following NCERT's own emphasis.
Module 1 — Diversity & Plant Structure
1 The Living World & Biological Classification
Binomial nomenclature — naming each species with a two-part Latin name (genus + species) — was given by Carl Linnaeus. The taxonomic hierarchy, broadest to narrowest, runs: Kingdom → Phylum → Class → Order → Family → Genus → Species.
Whittaker's five kingdom classification — Monera, Protista, Fungi, Plantae, Animalia — groups organisms by cell structure, body organization, mode of nutrition, and reproduction. Monera contains all prokaryotic organisms (bacteria), which lack a true nucleus.
2 Plant Kingdom & Animal Kingdom
The plant kingdom is broadly classified into Algae, Bryophytes, Pteridophytes, Gymnosperms, and Angiosperms. Bryophytes are called the "amphibians of the plant kingdom" because they need external water for fertilization, just as amphibians need water for reproduction. Gymnosperms bear "naked" seeds — not enclosed within a fruit, unlike angiosperms.
Animal classification uses criteria like levels of organization, symmetry, and presence/type of coelom. Coelenterates (Cnidaria) show radial symmetry, while most higher phyla show bilateral symmetry. All Chordates share a notochord at some stage of development.
3 Morphology of Flowering Plants
A tap root system develops from the radicle of the seed; roots and stems can be modified for storage, support, or other functions — a potato's edible portion, for instance, is a modified underground stem (tuber), not a root.
A flower's androecium (stamens) is the male reproductive whorl; the gynoecium (carpels/pistil) is the female. Inflorescence types split broadly into racemose (main axis keeps growing indefinitely, flowers open oldest-first from base upward) and cymose (main axis terminates in a flower, growth continues via lateral branches).
4 Anatomy of Flowering Plants & Structural Organisation in Animals
Meristematic tissue — cells that divide actively — is responsible for plant growth; once cells differentiate, they become permanent tissue (simple, like parenchyma, or complex, like xylem and phloem). Xylem transports water and minerals upward; phloem transports the products of photosynthesis (food) in both directions.
In animals, the four basic tissue types are epithelial (covering/lining), connective (support/binding), muscular (movement), and nervous (signaling). Cardiac muscle is distinctively both striated (like skeletal muscle) and involuntary (like smooth muscle).
Module 2 — Cell Biology & Plant Physiology
5 Cell Structure and Function
Cell theory states that all living organisms are composed of cells, and that all cells arise from pre-existing cells. Prokaryotic cells (bacteria) lack a membrane-bound nucleus; eukaryotic cells have one, along with membrane-bound organelles.
Mitochondria are called the "powerhouse of the cell" for their role in ATP production. Ribosomes are the site of protein synthesis. Lysosomes are nicknamed "suicide bags" because they contain digestive enzymes that, if released, can break down the cell itself.
6 Biomolecules and Cell Cycle
The four major biomolecule classes are carbohydrates, proteins, lipids, and nucleic acids. Enzymes are biological catalysts (mostly proteins) that speed up reactions without themselves being consumed.
The cell cycle proceeds through G1 (growth), S (DNA replication/synthesis), G2 (further growth/preparation), and M (mitosis). Mitosis produces two genetically identical daughter cells with the same chromosome number as the parent; meiosis produces four daughter cells with half the chromosome number (haploid), essential for sexual reproduction.
7 Transport in Plants & Mineral Nutrition
The cohesion-tension (transpiration pull) theory explains how water is pulled upward through the xylem, driven by evaporation from leaf surfaces and held together by the cohesive properties of water molecules. Water moves between cells from higher to lower water potential.
Plants require both macronutrients (needed in larger quantities, like nitrogen, phosphorus, potassium) and micronutrients (needed in trace amounts). Nitrogen fixation converts atmospheric N₂ into usable forms like ammonia, often carried out by bacteria such as Rhizobium in root nodules.
8 Photosynthesis, Respiration & Plant Growth
The oxygen released during photosynthesis comes from the splitting (photolysis) of water molecules — not from CO₂. Light reactions occur in the thylakoid membrane (producing ATP, NADPH, and O₂); the Calvin cycle (dark reactions) occurs in the stroma, fixing CO₂ into sugar. C4 plants are generally more efficient than C3 plants in hot, dry climates, due to reduced photorespiration.
Cellular respiration begins with glycolysis in the cytoplasm, producing pyruvate, followed by the Krebs cycle and electron transport chain in mitochondria. Among plant hormones, auxin is primarily responsible for apical dominance (suppressing lateral bud growth).
Module 3 — Human Physiology I
9 Digestion, Breathing and Exchange of Gases
Pepsin, secreted by the stomach, digests proteins; most nutrient absorption happens in the small intestine, whose villi and microvilli maximize surface area. Alveoli in the lungs are the primary site of gas exchange between air and blood.
Oxygen is transported mainly bound to hemoglobin as oxyhemoglobin, while most CO₂ is transported as bicarbonate ions in the blood plasma.
10 Body Fluids and Circulation; Excretory Products and their Elimination
Red blood cells (erythrocytes) transport oxygen via hemoglobin. The heart's SA node (sinoatrial node) is called the natural pacemaker, since it initiates each heartbeat's electrical signal.
The nephron is the structural and functional unit of the kidney. Urine formation involves three steps: filtration (at the glomerulus/Bowman's capsule), selective reabsorption, and tubular secretion.
11 Locomotion and Movement; Neural Control and Coordination
Muscle contraction is explained by the sliding filament theory — actin filaments slide over myosin filaments, shortening the muscle without the filaments themselves changing length. A neuron's resting membrane potential (around −70mV) becomes more positive during an action potential as ion channels open.
At a synapse, signals typically cross via released neurotransmitters. A reflex arc allows a rapid, involuntary response (like pulling a hand from a hot surface) that's processed at the spinal cord level, without requiring the brain to react first.
Module 4 — Human Physiology II & Reproduction
12 Chemical Coordination and Integration
The pituitary gland is often called the "master gland" because it regulates the activity of many other endocrine glands. Insulin, secreted by the pancreas, lowers blood glucose; thyroxine, from the thyroid, regulates basal metabolic rate.
Hormone secretion is commonly regulated through negative feedback — rising hormone levels (or their downstream effects) signal back to reduce further secretion, keeping levels within a controlled range.
13 Reproduction in Organisms & Sexual Reproduction in Flowering Plants
Asexual reproduction produces offspring genetically identical to the parent (barring mutation); sexual reproduction introduces genetic variation through gamete fusion. Self-pollination transfers pollen from anther to stigma of the same flower or a genetically identical plant, while cross-pollination transfers it between genetically different plants.
Double fertilization is a distinctive feature of angiosperms: one sperm fertilizes the egg to form the zygote, while a second fuses with the polar nuclei to form the triploid endosperm. After fertilization, the ovary typically develops into the fruit and the ovules into seeds.
14 Human Reproduction and Reproductive Health
Sperm are produced in the seminiferous tubules of the testes. Fertilization in humans typically occurs in the fallopian tube (oviduct). The menstrual cycle is regulated by a coordinated interplay of FSH, LH, estrogen, and progesterone.
Among contraception methods, barrier methods (like condoms) are notable for also helping prevent sexually transmitted infections — a protective benefit most hormonal methods don't provide.
Module 5 — Genetics & Evolution
15 Principles of Inheritance and Variation
Mendel's law of segregation states that the two alleles for a trait separate during gamete formation, so each gamete carries only one. A monohybrid cross between two heterozygotes typically produces a 3:1 phenotypic ratio in the offspring.
In humans, biological sex is determined by whether the fertilizing sperm carries an X or a Y chromosome (the egg always contributes X). Genes located close together on the same chromosome tend to be inherited together — a phenomenon called linkage, which is an exception to Mendel's law of independent assortment.
16 Molecular Basis of Inheritance
DNA replication is semiconservative — each resulting DNA molecule contains one original (parental) strand and one newly synthesized strand. The central dogma of molecular biology describes the flow of genetic information: DNA → RNA (transcription) → Protein (translation).
A codon — a sequence of three nucleotides — specifies a particular amino acid (or a stop signal) during translation.
17 Evolution
Darwin's theory of natural selection proposes that individuals with traits better suited to their environment tend to survive and reproduce more successfully, gradually shifting a population's traits over generations. Homologous organs (like a bird's wing and a human's arm) share structural similarity due to common ancestry, despite performing different functions — evidence for evolution.
The Hardy-Weinberg principle describes the conditions (no mutation, no migration, random mating, large population, no selection) under which allele frequencies in a population remain constant — i.e. no evolution is occurring. Adaptive radiation describes a single ancestral species diversifying into many species adapted to different niches, as with Darwin's finches.
Module 6 — Human Welfare, Biotechnology & Ecology
18 Human Health and Disease & Microbes in Human Welfare
Vaccination works by stimulating the immune system to produce memory cells against a specific pathogen, without causing the actual disease — so a real future infection is fought off faster. Malaria is caused by a protozoan parasite (Plasmodium), transmitted by the female Anopheles mosquito.
Beneficial microbes include Lactobacillus, used in fermenting milk into curd, and various microorganisms used to produce antibiotics like penicillin — which work by targeting bacteria-specific processes (like cell wall synthesis) rather than human cell processes.
19 Biotechnology: Principles, Processes and Applications
Restriction enzymes cut DNA at specific recognition sequences — an essential tool for recombinant DNA technology, letting scientists cut and paste genes between organisms. PCR (polymerase chain reaction) amplifies a specific DNA sequence into millions of copies for study or use.
Bt cotton is a genetically modified crop engineered to produce a toxin (from Bacillus thuringiensis) that confers resistance against certain insect pests. Human insulin is now commonly produced using genetically engineered bacteria carrying the human insulin gene, rather than extracted from animal sources.
20 Ecology and Environment
Logistic population growth levels off as a population approaches the environment's carrying capacity, unlike unconstrained exponential growth. Decomposers break down dead organic matter, recycling nutrients back into the ecosystem.
The pyramid of energy in any ecosystem is always upright, since energy is lost as heat at each trophic level (a consequence of the second law of thermodynamics) — unlike pyramids of numbers or biomass, which can sometimes be inverted. Ozone layer depletion is primarily linked to the release of chlorofluorocarbons (CFCs) into the atmosphere.