Q. 94.3( 7 Votes )
We do not clean ponds or lakes, but an aquarium needs to be cleaned. Why?
A pond or lake is not required to be cleaned because they have their own natural system to clean them but aquarium is a man-made ecosystem and consists of a very small area or space. Moreover, the abiotic components are supplied by human and are not naturally. So. For survival of living bodies in the aquarium, it is necessary that it should be cleaned regularly.
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The gas A is used by most of the animals to obtain energy from food by the process of respiration. When A is acted upon by radiation X, it gets converted into another gas B which is an allotrope of A but poisonous when inhaled. B forms a kind of layer C in the upper atmosphere which absorbs radiations X coming from a source Y and prevents them from reaching the earth. Some chemicals Z released from the various devices on the earth are destroying the layer C slowly. In fact, a hole has already been formed in layer Cover the area D of the earth.
(a) What are gases?
(i) A, and
(ii) B? Write their molecular formulae.
(b) Name the layer C.
(c) What are (i) X, (ii) Y, and (iii) Z?
(d) Name the area D.
(e) Name any two human ailments which may be caused by X.Lakhmir Singh & Manjit Kaur- Biology
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