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Standard IX
Biology
Introduction to Waste
For the survi...
Question
For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed
A
3 ppm
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B
4 ppm
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C
5 ppm
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D
8 ppm
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Q.
Match the columns and find correct option.
I(Organisms)
II(DDT in ppm)
(a)
Zooplankton
(p)
0.003
ppm
(b)
Small fishes
(q)
2.0
ppm
(c)
Water
(r)
25.0
ppm
(d)
Fish eating birds
(s)
0.04
ppm
(e)
Big fishes
(t)
0.5
ppm
Q.
The T.L.V values of four pollutants A,B,C and D are 9 ppm, 10 ppm, 100 ppm and 500 ppm respectively. The most toxic is:
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