Glands are of two types: Exocrine glands: Exocrine glands are those which pour their secretions into a duct. For example, sweat glands, tear glands, etc.Endocrine glands: Endocrine glands ar… Read More

Advertisement of WBCS(Executive) ETC. EXAMINATION, 2001 has been published by the Public Service Commission, West Bengal on 21/08/2010 on leading newspapers.Brief Information: QUALIFICATIONS… Read More

The nervous system perceives the changes around us through our senses. It controls and coordinates all the activities of the muscles in response to the changes outside. It also conducts mess… Read More

In living organisms energy is produced by metabolically burning food. But this is accompanied by the formation of a variety of by-products which are harmful to the organism. These wastes hav… Read More

Plants take water and mineral nutrients from the soil through the roots and transport it to the leaves. The leaves prepare food for the plant, using water and carbon dioxide during photosynt… Read More

Respiration is essential for survival of living organisms. It releases energy from the food. Respiration is defined as the catabolic biochemical process during which organic compounds break… Read More

All organisms take food and utilise it to get energy for the growth and maintenance of their bodies. Plants are the only organisms that can prepare food for themselves by using water, carbon… Read More

There are 10 major phyla in the animal kingdom from Protozoa to Chordata. Protozoa : This most primitive unicellular organisms which reproduce by fission, budding,spores or sexually. e.g. Am… Read More

Plants are multicellular photosynthetic producers of biosphere. With the help of protists and fungi, plants provide the oxygen we breathe. The plant kingdom consists of 260,000 known species… Read More

Microorganisms or microbes are too small and are not visible to the unaided eye. They may be unicellular or multicellular. Microorganisms include bacteria, fungi, protozoa and some algae. Vi… Read More

A group of cells of the same type or of a mixed type having a common origin and performing similar functions are called tissues.Plant tissues are of two main types –Meristematic Tissue… Read More

All organisms are made of smaller parts called organs. Organs are made of still smaller parts. The smallest living part of an organism is a ‘cell’.The word cell is derived from t… Read More

Hydrogen: Symbol H, formula H2. The first element in the periodic table and the most basic and common of all elements in the universe. Over ninety percent of all the atoms in the universe ar… Read More

Hydrogen: Symbol H, formula H2. The first element in the periodic table and the most basic and common of all elements in the universe. Over ninety percent of all the atoms in the universe ar… Read More

Organic chemistry is that branch of chemistry which deals with the study of compounds of carbon with hydrogen (hydrocarbons), and their derivatives. Presently about five million organic comp… Read More

Atoms are made up of three smaller particles called protons, neutrons and electrons. The protons and neutrons are found in the nucleus of the atom. Protons have a single positive charge. Thi… Read More

The grouping of elements with similar properties together and the separation of elements with dissimilar properties is known as classification of elements. The table, which classifies elemen… Read More

An atom is the smallest particle of the element that can exist independently and retain all its chemical properties.Atoms are made up of fundamental particles: electrons, protons and neutron… Read More

Properties of Gases: First, we know that a gas has no definite volume or shape; a gas will fill whatever volume is available to it. Contrast this to the behavior of a liquid, which always ha… Read More

Atoms and Molecules, Elements and Compounds: There are about a hundred different types of atoms in the Universe. Substances made up of a single type of atom are called Elements. Some element… Read More

ACID: The word 'acid' is derived from a Latin word, which means "sour". The sour taste of most of the fruits and vegetables is due to various types of acids present in them. The digestive fl… Read More

MATTER AND ITS NATURE: Anything that possesses mass, occupies space, offers resistance and can be perceived through one or more of our sense is called matter. Matter is made up of particles… Read More

The limitless expanse of space around us consisting of solar system, galaxies, stars and planets etc, is called universe. The age of the universe is estimated to be (1-2)X1010 years.The vast… Read More

An atom is the smallest particle of the element that can exist independently and retain all its chemical properties.Dalton’s atomic theory , which suggested that the atom was indivisib… Read More

Sound is a form of energy and like all other energies, sound is not visible to us. It produces a sensation of hearing when it reaches our ears. Sound can not travel through vacuum. Sound is… Read More

To understand light you have to know that what we call light is what is visible to us. Visible light is the light that humans can see. Other animals can see different types of light. Dogs ca… Read More