Class VI

Photosynthesis occurs during the
  1. night
  2. day time
  3. evening
  4. none of them
Air solubility of water is defined as ability of air to be dissolved in
  1. space
  2. container
  3. gas
  4. water
Photosynthesis is a process in which carbon dioxide and water combine to form
  1. carbon
  2. calcium
  3. chlorophyll
  4. carbohydrates
Chemical formula of ozone is
  1. O3
  2. O2
  3. O4
  4. O5
Percentage composition of oxygen in air is
  1. 21%
  2. 31%
  3. 41%
  4. 51%
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