CIE iGCSE Co-Ordinated Science B19.1 Habitat destruction Exam Style Questions Paper 2
Question
Which processes change the amount of carbon dioxide in the air?
▶️Answer/Explanation
Ans: A
Question
Which graph represents a pollution incident in a lake causing eutrophication?
▶️Answer/Explanation
Ans: B
Question
The release of fertiliser into rivers and lakes causes eutrophication which can lead to the death of fish.
What causes the fish to die?
(A) Decreased photosynthesis by producers reduces the carbon dioxide.
(B) Increased photosynthesis by producers reduces the oxygen.
(C) Increased decomposition reduces the carbon dioxide.
(D) Increased decomposition reduces the oxygen.
▶️Answer/Explanation
Ans : D
Question
The list shows changes that occur in a lake which is polluted by fertiliser.
1. Decomposers feed on aquatic plants.
2. Growth of algae increases.
3. Oxygen levels decrease in the lake.
4. Aquatic plants die.
In which order do these changes occur?
(A) 2 → 4 → 1 → 3
(B) 2 → 3 → 4 → 1
(C) 3 → 4 → 2 → 1
(D) 3 → 4 → 1 → 2
▶️Answer/Explanation
Ans : A