Olibits / Science / Interactions in Ecosystems
Primary 6 Science: Interactions in Ecosystems Practice
Real Primary 6 Science questions on Interactions in Ecosystems, pulled directly from the Olibits question bank — the same questions a child would actually see, not separately written for this page.
Curriculum alignment
Science Teaching & Learning Syllabus, Primary Three to Six (MOE, 2023 syllabus)
Science is not a taught subject at P1/P2 under MOE's own syllabus — our P1/P2 Science content is offered as enrichment beyond the official syllabus, not as a claim of syllabus coverage at those grades.
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Real Interactions in Ecosystems practice questions
In the food chain: grass -> grasshopper -> frog -> snake, which organism is the primary consumer?
Grasshopper ✓
Grass
Frog
Snake
The grasshopper is the primary consumer because it is the first organism in the chain to eat the producer, grass.
What does an arrow between two organisms in a food chain represent?
The size difference between the two organisms
The order in which organisms were born
The direction in which energy flows, from the organism eaten to the one eating it ✓
The direction an animal moves in the wild
The arrow points from the organism being eaten towards the organism that eats it, showing the flow of energy along the chain.
Why do most ecosystems have food webs rather than a single simple food chain?
Because most animals eat more than one type of food and are eaten by more than one predator ✓
Because food chains cannot exist in nature
Because there is only one producer in most ecosystems
Because animals in an ecosystem never interact with each other
Since many organisms eat and are eaten by several different species, multiple food chains link together to form a more realistic food web.
In the food chain grass -> grasshopper -> frog -> snake, what would likely happen to the frog population if all the grasshoppers disappeared?
The frog population would turn into grasshoppers
The frog population would increase rapidly
The frog population would likely decrease, as they lose their main source of food ✓
The frog population would stay exactly the same
Since frogs rely on grasshoppers as food in this chain, losing grasshoppers would reduce the food available to frogs, causing their numbers to fall.