Question : Photosynthesis takes place in the presence of chlorophyll and

Option 1: water

Option 2: nutrients

Option 3: carbon dioxide

Option 4: sunlight

Question : The liberation of oxygen during photosynthesis is due to

Option 1: Hydrolysis of carbohydrates

Option 2: Photolysis of water

Option 3: Reduction of CO₂

Option 4: Breakdown of chlorophyll

Question : What is the correct percentage by volume of various gases in Earth's atmosphere?

Option 1: 20.95% nitrogen, 78.09% oxygen and 0.04% carbon dioxide and other greenhouse gases

Option 2: 10.95% nitrogen, 88.09% oxygen and 0.09% carbon dioxide and other greenhouse gases

Option 3: 10.95% nitrogen, 78.09% oxygen and 0.03% carbon dioxide and other greenhouse gases

Option 4: 78% nitrogen, 21% oxygen and 0.03% carbon dioxide and other greenhouse gases

Question : What is dry ice?

Option 1: Solid Carbon dioxide

Option 2: Solid Nitrogen dioxide

Option 3: Solid Sulphur dioxide

Option 4: Solid water

Question : The ozone layer is formed due to reactions of:

Option 1: oxygen and ultraviolet rays

Option 2: carbon dioxide and layers of the atmosphere

Option 3: cosmic rays and layers of atmosphere

Option 4: infrared rays and ultraviolet rays