Question Text
Question 1 :
Plants produce oxygen during the process of making their own food. State True or False.
Question 2 :
The layer of air around the earth is known as _____.
Question 4 :
Fill in the blanks.
Usha took a lump of dry soil in a glass and added water to it till it was completely immersed. She observed bubbles coming out. The bubbles contain _____.
Question 5 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61cc1a8f78c526e972caefba.PNG' />
Observe the above picture carefully and answer.
What is covering the nose and mouth of the policeman?
Question 7 :
We can feel air but we cannot see it. State True or False.
Question 8 :
Fill in the blanks:
Mountaineers carry oxygen ______ with them, while climbing high mountains.
Question 10 :
Fill in the blanks:
Air is a ______ of some gases.
Question 14 :
Air is present everywhere but not in soil. State True or False.
Question 15 :
Air helps in the movements of sailing yachts and glider but plays no role in the flight of birds and aeroplanes. State True or False.