MEDIUM
8th Foundation
IMPORTANT
Earn 100
Study the given Venn diagram. X is likely to be ______
50% studentsanswered this correctly
Important Questions on Pollution of Air and Water
MEDIUM
8th Foundation
IMPORTANT
Study the given flow chart and identify T, Q and R
| P | Q | R | |
| (A) | Livestock | Aluminium can | DDT |
| (B) | Garbage | BHC | Aluminium cans |
| (C) | Sewage sludge | DDT | Styrofoam cup |
| (D) | Livestock wastes | BHC | Grocery |
HARD
8th Foundation
IMPORTANT
MEDIUM
8th Foundation
IMPORTANT
HARD
8th Foundation
IMPORTANT
Refer to the given food web.
If a non-biodegradable insecticide known as DDT was sprayed onto the pine tree, in which of the following organisms will most of the DDT eventually accumulate?
MEDIUM
8th Foundation
IMPORTANT
Match column I with column II and select the correct option from the codes given below.
| Column I | Column II | ||
| (a) | Carbon dioxide in the air | (i) | Damage ozone layer |
| (b) | Sulphur dioxide in the air | (ii) | Produces acid rain |
| (c) | Chlorofluorocarbons | (iii) | Prevents photosynthesis |
| (d) | Dust in air | (iv) | Lead to global warming |
MEDIUM
8th Foundation
IMPORTANT
(i) They drank the water that was contaminated by the oil
(ii) The fish swallowed the oil and were poisoned
(iii) They breathed in the oil fumes near the water surface and were suffocated
HARD
8th Foundation
IMPORTANT
(i) Water collected from the river is made free of large pieces of dirt and pumped into reservoirs.
(ii) Water is passed through filter beds.
(iii) Water is stirred in a flocculation tank.
(iv) Water is allowed to stand in large tanks.
(v) Water is chlorinated.
(vi) Filtered water is stored.
(vii) Water is supplied to homes and factories by huge water mains.
Select the option which arrange the steps in correct sequence.
MEDIUM
8th Foundation
IMPORTANT
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.
