All Environment and Ecology PYQs UPSC CSE 2025 Prelims

All Environment and Ecology PYQs UPSC CSE 2025 Prelims
Q1. With reference to the planet Earth, consider the following statements: [2025] I. Rain forests produce more oxygen than that produced by oceans. II. Marine phytoplankton and photosynthetic bacteria produce about 50% of world’s oxygen. III. Well-oxygenated surface water contains several folds higher oxygen than that in atmospheric air. Which of the statements given above is/are correct? a) I and II b) II only c) I and III d) None of the above statements is correct Q2. Regarding Peacock tarantula (Gooty tarantula), consider the following statements: [2025] I. It is an omnivorous crustacean. II. Its natural habitat in India is only limited to some forest areas. III. In its natural habitat, it is an arboreal species. Which of the statements given above is/are correct? a) I only b) I and III c) II only d) II and III Q3. Consider the following pairs:

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