Bihar TET · Mathematics and Science (Paper II)
Ecosystem, food chains 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 role of grass in this food chain?
Q2 · Environment and Ecosystem · MEDIUM
A factory near a river discharges hot water into the river, raising the water temperature significantly. This causes the amount of dissolved oxygen in the water to decrease, leading to the death of many fish. This is an example of which type of pollution?
Q3 · Environment and Ecosystem · MEDIUM
In an ecosystem, which of the following statements correctly describes the flow of energy?
Q4 · Environment and Ecosystem · HARD
In a pond ecosystem, the biomass (total dry weight of organisms) at different trophic levels was measured. The measurements were: Phytoplankton (producers) = 1000 kg, Zooplankton (primary consumers) = 100 kg, Small fish (secondary consumers) = 10 kg, Large fish (tertiary consumers) = 1 kg. If pesticides are introduced into the pond and accumulate in organisms without being broken down, in which organisms will the concentration of pesticides be highest?
Q5 · Environment and Ecosystem · EASY
Which of the following is an example of a decomposer in an ecosystem?