The slope of a distance versus time graph is speed. A distance-time graph shows how far an object has travelled in a given time. Distance is... View Article
Potassium burns in water with lilac coloured flame. Potassium reacts with cold water and gives potassium hydroxide and hydrogen gas. 2K(s) +... View Article
Sleeping sickness also called African trypanosomiasis is a disease caused by infection with the flagellate protozoan Trypanosoma brucei gambiense... View Article
Extensive cultivation is found in thinly populated areas. It is one in which more and more land is brought under cultivation to increase the... View Article
Severe diarrhea and vomiting can occur due to cholera Cholera is a bacterial disease usually spread through contaminated water. It causes... View Article
The thorax in the housefly carries three pairs of legs. Flies have a pair of fully developed wings on the thorax, and a knobby, vestigial... View Article
Weak acids and weak bases are weak electrolytes. Substances that dissociates into ions to a lesser extent are called weak electrolytes. Their... View Article
Plants and animals are dependent on oxygen for respiration. Respiration is the sequence of events resulting in the exchange of oxygen and... View Article
The Volume-Temperature relationship is given by  Charle's law French physicist Jacques Charles (1746-1823) studied the effect of temperature on... View Article
A solution will be hypertonic to a cell if its solute concentration is higher than inside the cell, and the solutes cannot cross the membrane.... View Article
A vernier caliper is used for measuring lengths to an accuracy of 10-4 m. The vernier calipers found in the laboratory incorporate the main... View Article
Red cabbage turns green on adding to basic solutions. Red cabbage contains a water-soluble pigment called anthocyanin that changes colour when it... View Article
They are of glacial origin. Most of the freshwater lakes are in the Himalayan region. They are of glacial origin. They are formed when glaciers... View Article
The disease polio affects the Central Nervous System A polio infection often damages or destroys many of these motor neurons. To compensate for... View Article
The change in the focal length of an eye lens is caused by the action of the Ciliary muscles. The ciliary muscle is a circular muscle that... View Article
Substances that completely dissociates into ions are called strong electrolytes. Example: Sodium chloride, potassium chloride, lead bromide,... View Article
CaO + H2O → Ca(OH)2 This reaction is a combination reaction as calcium oxide, and water combines to form a single product that is calcium... View Article
Sebaceous glands produce an oily secretion called sebum. Sebum maintains body temperature, acts as an antimicrobial agent and keeps the skin... View Article
A symbol is a short form used for representing an element. Chemical symbols are used for the representation of any functional group, chemical... View Article
Epithelial tissue rests on an extracellular basement membrane The basement membrane is a skinny non-cellular fibrous membrane on which... View Article