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Subject :NSO    Class : Class 8

The events which occur in the water body after it has been polluted by fertilisers are given as follows :
(i) Submerged algae perish
(ii) Water plants undergo sudden proliferation
(iii) Consumers such as fish die
(iv) Oxygen levels fall
(v) Bacteria act on the increased number of dead organisms.
Arrange them in a correct sequence.

A (ii)→(i)→(iii)→(v)→(iv)
B (iii)→(iv)→(i)→(ii)→(v)
C (ii)→(i)→(v)→(iv)→(iii)
D (i)→(iv)→(v)→(iii)→(ii)


Ans 1:

Class : Class 8
answer here can also be A

Ans 2:

Class : Class 8
The question is wrong, water plants are not algae

Ans 3:

Class : Class 5

Ans 4:

Class : Class 8
d

Ans 5:

Class : Class 9
it should be a

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