2)Plants use when they manufacture food.
a)carbon dioxide b)nitrogen c)oxygen d)argon
3)Air is a mixture of gases. Which gas is least abundant?
a)hydrogen b)nitrogen c) helium d)oxygen
4)Strong wind can move objects. This force is known as
a) cool air b)gases c)air pressure d)motion
5)Oxygen will cause a glowing fire to
a)go out very quickly b)burn more rapidly
c)get dim d)not to light
6)Which gases are exchanged between human and plants?
a)oxygen and carbon dioxide b)carbon dioxide and nitrogen
c)hydrogen and oxygen d)nitrogen and hydrogen
7)The strong wind blew the flower pot out of its place. This incident shows that air
a)occupies space b) is colourless and odourless
c)exerts pressure d) is made up of different gases.
8)Which gas is needed for plant growth?
a)carbon dioxide b) oxygen c) nitrogen d) neon
9)What is the commonest noble gas in the air?
a) oxygen b) nitrogen c) argon d) neon
10) Which is the only process that produces oxygen?
a) combustion b) respiration c) decay d) photosynthesis
Answer these questions on the lines provided.
1)What is the meaning of the following terms? (3 marks)
a)respiration
b)photosynthesis
c)noble gas?
2)How do you know that air is in an object? (2 marks)
3)List three (3) things which indicate that air is all around us. (3 marks)
4)List three (3) ways in which we use air.(3 marks).
5)What are three (3) main components of air? (3 marks)
this is science its just that theres no science option i am deeply sorry
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2)Plants use when they manufacture food.
a)carbon dioxide b)nitrogen c)oxygen d)argon
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