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3.
A scientist observed a sudden increase in the number of algae in a lake eves a few days. The reason behind it could be that ________.
4.
Which of the following will NOT cause water pollution?
5.
Whenever we use the air conditioner, refrigerator, TV., etc., we send X gases into the air. Which of these is also an X gas?
6.
Amit continued to heat 100 mL of pure water for 15 minutes after It reached boiling point. Which of the following figures shows the result at the end of his experiment?
7.
Which of the following is the best method of purification of muddy water?
8.
Match the column I with column II and select the correct option.
Column I Column II
(Causes of soil erosion) (Methods of soil conservation)
a.Running water carries the topsoil with it 1.Embankments
b.Strong winds blow away humus-rich topsoil 2.Wind breaks
c.Indiscriminate cutting of trees 3.Afforestation
4.Terrace farming
Column I Column II
(Causes of soil erosion) (Methods of soil conservation)
a.Running water carries the topsoil with it 1.Embankments
b.Strong winds blow away humus-rich topsoil 2.Wind breaks
c.Indiscriminate cutting of trees 3.Afforestation
4.Terrace farming
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10.
____________ leads to pollution of water.