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21. The gas responsible for ozone depletion is (NTSE Kerala, Stage-I, 2016-17)
Nitrogen and argon
Carbon dioxide
Carbon monoxide
Chlorofluorocarbons
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22. This is an artificial ecosystem. (NTSE Jharkhand, Stage-I, 2015-16)
Pond
Crop field
Lake
Forest
23. In any ecosystem, fungi and bacteria are called (NTSE Jharkhand, Stage-I, 2016-17)
Producers
Decomposers
Consumers
None of these
24. The study of interaction between living organisms and environment is called (NTSE Madhya Pradesh, Stage-I, 2016-17)
Ecology
Phytogeography
Psychology
Mycology
25. Which of the following groups constitutes a correct food chain? (NTSE Rajasthan, Stage-I, 2015-16)
Grass → Rabbit → Snake → Eagle
Grass → Goat → Fox → Lion
Goat → Grass → Elephant → Snake
Grass → Wheat→ Frog → Goat
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