REET · Mathematics and Science (Level 2)
Ecosystem, food chains, biodiversity and pollution.
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Q1 · Environment and Ecosystem · EASY
In a grassland ecosystem, grass is eaten by grasshoppers, grasshoppers are eaten by frogs, frogs are eaten by snakes, and snakes are eaten by hawks. What is the position of the frog in this food chain?
Q2 · Environment and Ecosystem · MEDIUM
A factory near a river releases untreated chemical waste into the water. After a few months, many fish in the river die and the water develops a foul smell. Which type of pollution is primarily responsible for this situation?
Q3 · Environment and Ecosystem · MEDIUM
A forest ecosystem has the following organisms: 500 plants, 100 deer, 20 wolves, and decomposers (bacteria and fungi). If a disease kills most of the wolves, what is the most likely immediate effect on the ecosystem?