studyeasynotes

short notes "Management of Natural Resources" by Nagraj Sir Natural Resources – Resources provided to us by nature soil, air, water, forests, wildlife, coal and petroleum are used by man for his survival. Types of Resources  : (a) Exhaustible : present in limited quantity e.g. coal petroleum. (b) Inexhaustible : present in unlimited quantity e.g. air, water. Reduce:  This means that you use less. You save electricity by switching off unnecessary lights and fans. You save water by repairing leaky taps. You do not waste food. Recycle:  This means that you collect plastic, paper, glass and metal items and recycle these materials to make required things instead of synthesising or extracting fresh plastic, paper, glass or metal. Reuse:  This is actually even better than recycling because the process of recycling uses some energy. In the ‘reuse’ strategy, you simply use things again and again. Instead of throwing away used envelopes, you can rever...

NOTES ON OUR ENVIRONMENT ( Nagraj Sharma ) Environment :  The physical, chemical and ‘ biological conditions of the region in which an organism lives is called its Environment. It includes air, light, soil, temperature, water and the presence or absence of other organisms, i.e., the conditions for development or growth. Ecosystem :  A community of organisms, interacting with each other, plus the environment in which they live and with which they also interact. The examples of ecosystem are : a pond ; a desert; a forest; a lake ; a river ; a mountain ; the sea. All the above ecosystems are made-up of two main components. Food Chain :-   A food chain is a simple representation of transfer of energy from the sun to different biotic components of an ecosystem. When an animal takes food, this energy is supplied to the next level. and the process goes on.  Food Web:-    In any ecosystem, there can be many food chains which are interlinke...