Notes

Management of Forest Resources * Forest resources include the land, trees and different life forms including bacteria, fungi, ferns, flowering plants, nematodes, insects, birds, reptiles and large animals. * Forests are biodiversity hotspots – together, all the species of plants and animals help maintain the ecological stability of the forests. * We depend on the ... Read more

Our Environment * All the interacting organisms in an area together with the non-living constituents of the environment form an ecosystem. * Organisms in the ecosystem are classified into three groups – Producers, Consumers and Decomposers. * Organisms that make their food from inorganic substances are known as producers. * Organisms that consume the food ... Read more

Sources of Energy * A non-renewable source of energy is one that cannot be replenished in a short period of time. Non-renewable fuels are classified as:    * Fossil fuels like coal, oil and natural gas    * Nuclear fuels like uranium, tritium and thorium * A renewable source of energy is one that can ... Read more

Magnetic Effects of Electric Current * When an electric current passes through a conductor, a magnetic field is created around the conductor. This phenomenon is known as the magnetic effect of electricity. * A magnetic field is the extent of space surrounding a magnet where the magnet’s effect can be felt. * Magnetic field lines ... Read more

Current Electricity Basics * Electric current is uniform flow of charges in a particular direction. * The rate of flow of charge or uniform motion of electrons: ( I = Q/t) * Potential difference is the work done in moving a unit charge between two points in an electric field against the direction of force: ... Read more

Human Eye * The human eye is an optical device that serves as our organ of sight. It transforms light waves reflected from objects we see into images. The major parts of the human eye and their functions are:    *  Sclera: Protects and contains internal parts    *  Cornea: Refracts incident light    *  ... Read more