Question

In 1772, Joseph Priestley demonstrated that

• A. Plants foul the air
• B. Animals purify the air during day time
• C. Plants and animals restore air for each other
• D. Plants get killed in the air produced by animals

Answer 1

The correct option is C Plants and animals restore air for each other

Joseph Priestley discovered oxygen which is used by the plant and animals. He demonstrated that plants liberate oxygen as a product during photosynthesis and that oxygen is utilised by the animals during respiration. Further, plant consumes the carbon dioxide, exhaled by the animals, to carry out photosynthesis. Thus plants and animals restore air for each other.

So the correct answer is 'Plants and animals restore air for each other'.