Discussion
Which of the following statements regarding 'Air' is incorrect ?
Answer: B
The incorrect statement is that air is not present in soil.
Soil contains air in the spaces between its particles. Pouring water on dry soil releases bubbles, which shows the air being pushed out. This air supplies oxygen to plant roots and to the earthworms, insects and microbes that live in the soil.
The other statements are correct: air has weight, which an inflated balloon on a balance shows; air occupies space, as an inverted glass pushed into water shows; and air plays an important role in the water cycle by carrying water vapour and by evaporation.
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