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Several major ruling dynasties emerged in different parts of the subcontinent between the seventh and twelfth centuries. The Emergence of New Dynasties By the 7th century, there were big landlords or warrior chiefs in different regions of the subcontinent. Existing
Read MoreThe period from the second half of the 8th century up to first half of the 18th century is known as the “medieval period” of Indian history. The maps by Arab geographer Al-Idrisi (1154) and French cartographer (1720) give a
Read MoreRevision Notes on Wastewater Story Water Pollution When the water present on earth in the oceans, seas, rivers, lakes, ponds and under the ground gets contaminated, it is termed as water pollution. The contamination of water results in a change in
Read MoreRevision Notes of Ch 17 Forests: Our Lifeline Class 7th Science Topics in the chapter Forest → It is a large area of land thickly covered with trees, bushes etc. → It is a system comprising various plants, animals and micro-organisms.
Read MoreRevision Notes on Water: A Precious Resource Quick Facts 22 March is celebrated as World Water Day to bring awareness among the people about the conservation of water. 2003 was called as the International year of freshwater to bring awareness among
Read MoreWhat is light? Light is a radiation or a form of energy that our eyes can detect. Light enables us to view our surroundings. Light travels from one place to another in a straight line. Figure 1: Light always travels
Read MoreElectric CircuitsA continuous conducting path (consisting of wires, bulb, switch, etc.) between the two terminals of a cell or battery along with an electric current flows, is known as an electric circuit.e.g. take a cell having a positive terminal (+)
Read MoreRevision Notes on Motion and Time What is Motion? If an object keeps on changing its position with time, it is said to be moving or in motion. Motion can be of different types: Linear or straight in which the object travels
Read MoreAll the living organisms including plants and animals have the capability to produce new individuals during their lifespan. This process of producing a new organism from the existing organism (or the parent) of the same species is called reproduction. The
Read MoreIn unicellular organisms, the intake of food, water, oxygen and removal of waste material occur across the cell surface by the process of diffusion. Plants and animals are multicellular. They have a specific organ to perform specific functions. To perform
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