Q1
Air helps in dispersal of ______ and ______ of flowers of several plants.
Answer:
Air helps in dispersal of seeds and pollen grains of flowers of several plants.
Q2
______ is the major component of air.
Answer:
We know that atmosphere contains 78% Nitrogen.
Thus, the correct statement is
Nitrogen is the major component of air.
Q3
Air in motion is known as ______.
Answer:
Air in motion is known as Wind .
Q4
Nitrogen______ burning.
Answer:
Nitrogen does not support burning.
Q5 Why is it advised to breathe through the nose and not through the mouth?
Answer:
It is not proper to breathe through our mouth because most of the dust particles can enter our body along with the air we breathe in. But breathing through nose does have this because nose has hair present which traps the dust particles.
Q6
Why do factories have large chimneys?
Answer:
Large chimneys take the harmful smoke and gases produced in the factories high up in the air so as to reduce its harmful effects on the ground.
Q7
Name one process which removes carbon dioxide from air.
Answer:
Photosynthesis removes carbon dioxide naturally and trees are especially good at storing carbon removed from the atmosphere by photosynthesis.
