Which one of the following is not a part of biotic environment:
Insect, air, plants, birds?


Air

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Write full form of CFCs.


Chlorofluorocarbons.

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What are some of the waste materials that we generate in our homes?


Some of the the waste materials that we generate in our homes are :
Spoilt food, vegetable peels, plastic, PUC, used tea leaves, milk packets, empty cartons, used cloths, paper waste, empty medicine bottles, broken foot wear, etc.
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How much time does it take for certain commonly used products to biodegrade, when they are scattered around as litter?

The following chart shows the time taken for commonly used materials to biodegrade:

Item

Time taken to biodegrade

Cotton rags

1-5 months

Paper

2-5 months

Rope

3-14 months

Orange peels

6 months

Wool socks

1-5 years

Plastic coated paper milk cartons

5 years

Leather shoes

25-40 years

Nylon fabric

30-40 years

Tin cans

50-100 years

Aluminium cans

80-100 years

Glass bottles

1 million years

Plastic bottles

Do not biodegrade at all

 
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How much energy is lost in transfer from one trophic level to other in a food chain?


90%.

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