Water polluted by various human activities causes a number
of water borne diseases. Which of the following is not a water
borne disease?
(a) Cholera
(b) Typhoid
(c) Asthma
(d) Dysentry
Open drain system is a breeding place for which of the
following.
(a) Flies
(b) Mosquitoes
(c) Organisms which cause diseases
(d) All of these
Which of the following is/are products of wastewater
treatment?
(a) Biogas
(b) Sludge
(c) Both biogas and sludge
(d) Aerator
Sewage is mainly a
(a) liquid waste.
(b) solid waste.
(c) gaseous waste.
(d) mixture of solid and gas.
Which of the following is waste water?
(a) Water trickling from a damaged tap.
(b) Water coming out of a shower.
(c) Water flowing in a river.
(d) Water coming out of a laundry
“A bunch of seedlings were seen sprouting on a heap of animal
dropping in a forest.” How do you think is the seedling benefited
from the animal dung?
Two friends shared their experiences of their vacation trip to
two different forests. Do you think they would have seen the
same type of plants and animals during their respective trips?
Give reason.
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