P6 Science · Interactions within the Environment · 108 questions · difficulty D1–D5 · Singapore MOE-aligned
Sample questions
SAMPLE 1
In a grassland food web, grass → zebra → lion, and grass → antelope → lion. If a drought kills most of the grass, what will happen to the lion population?
A The lion population will increase because it can eat more zebras.
B The lion population will decrease because its prey will decrease.
C The lion population will increase because grass will grow back quickly.
D The lion population will stay the same because lions can eat other animals.
SAMPLE 2
A mangrove swamp food web includes: mangrove leaves → crabs → monitor lizards, and mangrove leaves → insects → spiders → birds. If a drought reduces the number of mangrove leaves, which group of organisms will be affected first?
A Spiders and crabs
B Monitor lizards and birds
C Birds and monitor lizards
D Crabs and insects
SAMPLE 3
In a mangrove ecosystem, a food chain is: mangrove leaves → fiddler crab → mudskipper → heron. If a disease kills most of the fiddler crabs, what will most likely happen to the mudskipper population?
A It will stay the same because mudskippers can eat other food.
B It will decrease because herons will eat more mudskippers.
C It will increase because there are fewer predators.
D It will decrease because its food source is reduced.
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