Mental Health & Stress
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With reference to the 'Hydrological Cycle' and 'Oxygen Cycle' under the teaching of Environmental Studies (EVS) and 'Biogeochemical Cycles', consider the following statements:
- 1. 'Transpiration' is the process by which water is released into the atmosphere from the stomata of plant leaves as water vapor, which forms clouds through condensation.
- 2. The oxygen cycle is a purely sedimentary cycle whose main reservoir is the rocks of the Earth's crust and its atmospheric balance is controlled solely by photosynthesis.
- 3. Chlorofluorocarbons (CFCs) are among the major ozone-depleting gases that reach the stratosphere and form chlorine free radicals under the influence of ultraviolet rays, decomposing ozone molecules into oxygen.
Which of the statements given above is/are correct?
✓ Correct! Well done.
✗ Not quite — the correct answer is highlighted above.
Detailed Explanation
Statement 1 is correct because transpiration is the process by which plants release water into the atmosphere as vapor, which is an important part of the water cycle. Statement 2 is incorrect because the oxygen cycle is a gaseous cycle, not a sedimentary cycle; it has a very large gaseous reservoir in the atmosphere and oceans. Statement 3 is correct because chlorofluorocarbons (CFCs) come into contact with ultraviolet radiation in the stratosphere to produce chlorine free radicals which are the main cause of ozone layer depletion.
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