Page 45 - Ranger SPM 2022 Biology

Biology SPM SPM Model Paper
8. Figure 8 shows a food chain in a freshwater lake.
Pelican

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Insects Fish

Algae

Decomposing bacteria
Figure 8

(a) Based on Figure 8, (i) Name the phenomenon that
caused the situation at the
(i) state the source of energy in lake.
the food chain. [1 mark]
[1 mark]
(ii) Which substance caused
(ii) build one pyramid of number algae to grow rapidly on the
for the food chain. surface of the lake? Explain
[1 mark] your answer.
[2 marks]
(b) Explain energy flow in the food
chain. (iii) Explain why the fish died in
[2 marks] the lake.
[2 marks]
(c) A farmer had planted many crops
and bred many livestock at the
lake. After a few months, he
noticed a layer of green algae
on the surface of the lake and
dead fishes floating on the lake
surface.

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Model Paper.indd 391 3/29/22 5:22 PM