WB TET · Mathematics and Science (Paper II)
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 eagles. What is the position of the frog in this food chain?
Q2 · Environment and Ecosystem · MEDIUM
A forest has tigers, deer, grass, insects, birds, trees, monkeys, and decomposers like fungi and bacteria. If all the tigers are removed from this ecosystem, what is the most likely immediate effect?
Q3 · Environment and Ecosystem · MEDIUM
Biodiversity hotspots are regions with high species richness that are under threat. The Western Ghats in India is one such hotspot. Which of the following statements best explains why preserving biodiversity hotspots is important?
Q4 · Environment and Ecosystem · HARD
In an experiment, two identical aquatic ecosystems (tanks with water, plants, fish, and snails) were set up. Tank A was kept sealed with only light entering. Tank B was kept open. After two weeks, the fish in Tank A died while those in Tank B survived. Which explanation best accounts for this observation?
Q5 · Environment and Ecosystem · MEDIUM
Which of the following best describes a food chain in an ecosystem?