Page 2 - 2-HA-Practice Worksheet-1
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Q. 9 Nitrogen is very important for plants and animals. 3 R
Mention its three important uses.
Q. 10 Give a reason for the following:- 5 U&
a) Water animals can survive underwater. A
b) Mountaineers carry oxygen cylinders.
c) If a burning candle is covered by glass, is put off.
d) A sea diver carries an oxygen cylinder.
e) Oxygen is supplied to patients during the operation.
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