Question

Dy the presence
given graph shows changes in various
factors (L, M and N) present in a water body
after the sewage is discharged at a point X
e should always
Il only
II, III and IV
gh red hot coke,
ed. The name of
composition are
Amount/Number
M
N
Х
2
co
Fully and fill in the
propriate option
t Characteristic
of product
Turns red
litmus solution
blue
s, Burns with
Sewage discharge point
Distance downstream -
Refer to the given graph and select the
incorrect statement regarding L, Mand N.
A. L could be bacteria which increase
tremendously in number due to
addition of sewage waste.
B. M corresponds to biological oxygen
demand which decreases due to the
accumulation of sewage in water,
C. N could be aquatic animals like fish,
which die on account of non-availability
of dissolved oxygen.
D. Both A and C
Rand​

Answer 1

Answer:

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