Q31 of 163 Page 226

Explain why, some materials are biodegradable but some are non-biodegradable.

(B) From the above activity we can say that some materials are biodegradable because they can be decomposed by micro-organisms/decomposers. Some substances are non-biodegradable because the micro-organisms/decomposers cannot break or decompose them.


Decomposers are specific in their action.


More from this chapter

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30

Which of the following are biodegradable and which non-biodegradable?

● Glass bottle, Paper, Ball point pen refill, Hay, DDT, Wheat, Cake, Wood, Polythene bag, Jute bag, Cotton cloth, Grass, Vegetable peels

 31

Describe an activity to show that while paper is biodegradable but plastic (say, polythene) is non- biodegradable.

 32

Write down a food chain:

(a) In the sea


(b) Which ends with human-beings


(c) With five links in it.

 33

At which trophic level a person is feeding when he is eating:

(a) Roasted chicken


(b) Bread


(c) Eggs


(d) Apple


(e) Fish