Multiple choice

Out of various gases present in the atmosphere, plant life mostly depends on

  1. concentration of oxygen needed for respiration

  2. amount of nitrogen available through soil

  3. concentration of carbon dioxide needed for photosynthesis

  4. concentration of sulphur dioxide available as sulphate
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C Correct answer
Explanation

While plants require oxygen for cellular respiration, this process occurs continuously and oxygen is readily available from the atmosphere. Photosynthesis depends on carbon dioxide concentration, which is typically the limiting factor in plant growth. Nitrogen is obtained through soil, but plants don't directly use atmospheric nitrogen in significant quantities. Sulphur dioxide is not essential for plant life. Plant productivity is primarily limited by CO2 availability for photosynthesis.

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