1. A good fuel produces a huge amount of heat on burning, does not produce a lot of smoke, and is easily available.

    A good fuel produces a huge amount of heat on burning, does not produce a lot of smoke, and is easily available.

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  2. A good source of energy satisfies: It does a huge amount of work per unit mass. It is easily accessible. It is easy to store and transport. It is economical.

    A good source of energy satisfies:

    It does a huge amount of work per unit mass.

    It is easily accessible.

    It is easy to store and transport.

    It is economical.

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  3. Non-biodegradable substances do not decompose easily so it produces land and water pollution. These substances can harm animals, human and can even cause their death if eaten accidentally.

    Non-biodegradable substances do not decompose easily so it produces land and water pollution.

    These substances can harm animals, human and can even cause their death if eaten accidentally.

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  4. (i) Microorganisms like bacteria decomposed biodegradable substances and then recycled. (ii) These substances keep the environment clean.

    (i) Microorganisms like bacteria decomposed biodegradable substances and then recycled.
    (ii) These substances keep the environment clean.

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  5. The microorganism like bacteria and other decomposer organisms (called saprophytes) present In our environment are specific in their action. They break down the materials or products made from natural materials (say, paper) but do not break down man-made materials such as plastics. So, it is due toRead more

    The microorganism like bacteria and other decomposer organisms (called
    saprophytes) present In our environment are specific in their action. They break down
    the materials or products made from natural materials (say, paper) but do not break
    down man-made materials such as plastics. So, it is due to the property of decomposer
    organisms of being specific in their action that some waste materials are biodegradable,
    whereas others are non-biodegradable.

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