Explore curated topics aligned to Class 9–12 curriculum. Filter by class and subject, or search by name.
2962 topics
Smoking is the inhalation of tobacco smoke from cigarettes, cigars, or pipes. Tobacco smoke contains thousands of chemicals, including nicotine, carbon…
Fossil fuel extra CO2: climate page. Deforestation: less uptake. Combustion vs respiration both make CO2; combustion is fast extra. Shells/limestone as long…
Synapse: The junction between axon terminal of one neuron and the dendrite of another neuron, where information from one neuron is transmitted or relayed…
Feature: Description; Cell type: Prokaryotic; Membrane lipids: Special lipids; branched hydrocarbon chains; Cell wall: No…
Halogen colours deepen down Group 17: F₂ pale yellow gas, Cl₂ greenish-yellow gas, Br₂ red-brown liquid, I₂ dark grey solid with violet vapour. In water/school…
Haloalkane + CN- (ethanolic KCN named in many books) -> nitrile, one extra carbon. Hydrolyse nitrile: carboxylic acid (acidic) or carboxylate (alkali). Reduce…
Series calculations use Rₜ = R₁ + R₂ + ..., equal current through all components, and voltage drops that sum to the supply voltage.
Ordered fossils reveal extinction, succession and transitional combinations. Dating and geological context place changes in time, although the record is…
Le Chatelier's Principle: If a change is imposed on a system at equilibrium, the position of the equilibrium will shift in a direction which tends to…
One arithmetic mean between a and b is A = a+b2 (ordinary average). To insert k arithmetic means between a and b, you make an AP of k+2 terms with first a…
For x^2 + px, add (p/2)^2 to make (x + p/2)^2. Then move the leftover constant. This solves quadratics that do not factor nicely, and it is how the formula is…
An ecosystem is community (living) plus abiotic (light, water, T, soil, pH). Habitat: address. Niche: job (what it eats, when, where). Population: one species…
Enzymes: Enzymes are biological polymers that catalyse biochemical reactions. In simple words: Enzymes are biological molecules (usually proteins) that…
Osmoregulation is the active regulation of the osmotic pressure of body fluids so that they do not become excessively dilute or excessively concentrated.…
Operators are special symbols or keywords in Python that perform operations on values (called operands) and produce a result. In simple words, operators…
A primary key prevents duplicate identity; indexes speed retrieval but add storage and update work.
Dialysis: A procedure to filter toxins from the blood by artificial methods when the kidneys are unable to perform this function is called renal dialysis.…
Density of a Regularly Shaped Solid is determined by measuring the object's mass using a balance, calculating its volume using the appropriate geometric…
Fracture: A fracture is the medical term for a broken bone. They occur when the physical force exerted on the bone is stronger than the bone itself.
Old solvents and refrigerants (CFCs) named as ozone history (air chapter). Modern haloalkanes still appear as named reagents in school. PVC monomer…
An aerofoil is a cross-sectional shape designed to produce lift. The textbook model relates faster airflow above the wing to lower pressure and slower airflow…
The main idea is that the value of the standard reduction potential (E°) directly indicates a species' strength as an oxidizing or reducing agent: -…
Electric potential at a point is electric potential energy per unit charge.
A cell is defined as the structural and functional unit of living organisms. It is the basic structural unit of all unicellular and multicellular…
