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Modules

STEM

Venation

Overview: Fine lines present on the surface of a leaf are leaf veins. The pattern of arrangement of veins on the leaf is called venation. It can be...

Overview: Chromosomes are formed by the condensation of chromatin. They are mainly of four types, namely, metacentric, submetacentric, acrocentric and...

Overview: Pure substances are made of only one type of atom or only one type of molecule. For example, pure iron would only contain iron atoms, pure...

Overview: A heat engine is a device that converts some thermal energy into mechanical energy. Some examples of heat engines are: a thermal power station,...

STEM

Poliovirus

Overview: Poliovirus is a human retrovirus which is responsible for polio or poliomyelitis. It is mainly comprised of the RNA genome and protein capsid....

Overview: The excretory system consists of kidneys, ureter, urethra and urinary bladder. It helps the body in filtration and excretion of metabolic...

Overview: Water waves and sound waves require matter or a medium to move from place to place. In context with matter, waves travel fastest in solids...

Overview: The digestive system is one of the major organ systems of the human body. The main parts of the digestive system are the mouth, oesophagus,...

Overview: An electromagnetic wave can behave as a particle called a photon. A photon is a massless bundle of energy that behaves like a particle and...

Overview: A neuron is the basic component of the brain and the spinal cord of the central nervous system. The main parts of a neuron are nucleus, dendrite,...

Overview: Polarization of light is the phenomenon in which the vibrations of light are restricted in a direction perpendicular to the direction of the...

Overview: The cardiac cycle is the sequence of events that take place when the heart beats. A single cycle can be divided into two phases, systole and...

STEM

Teeth

Overview: A tooth has three parts. The outermost visible part is called the crown. The region which is hidden in gums is called the root. The region...

Overview: An object can float or sink depending on its density as compared to the density of the fluid in which it is placed. An object floats if its...

Overview: The human skeletal system is categorized into two types: the axial skeletal system and the appendicular skeletal system. The appendicular...

Overview: The digestive system is one of the major organ systems in our body. Its main parts are mouth, esophagus, stomach, liver, gallbladder, small...

Overview: A microscope is a device used to magnify small, close objects. It uses two convex lenses – an objective lens and eyepiece, with relatively...

STEM

Budding

Overview: Budding is a type of asexual mode of reproduction in which a new organism develops as a bud on the body of an existing organism (parent)....

Overview: A leaf is comprised of the upper epidermis, palisade mesophyll cells, spongy mesophyll cells, and the lower epidermis. The lower epidermis...

Overview: A plant comprises roots, a stem, leaves, flowers and fruit. The region on a plant from which a new bud or branch originates is termed as a...