Question 1 How will you show that air is present in a lump of soil? Question 2 How will you show that air is dissolved in water? Question 3 How do plants and animals maintain the balance of oxygen and carbon dioxide gases in air? Question 4 State few uses of windmill? Question 5 State uses of air? Question 6 Why are burrows and holes dug deep into soil by the … [Read more...] about Availability of Oxygen to Plants and Animals
Air Around Us
Carbon Dioxide, Water Vapours and Smoke
Question 1 State few properties of Carbon Dioxide gas? Question 2 From where does dust enter into the air? Question 3 Why should we breathe through the nose and not through the mouth? Question 4 What is smoke? How is smoke produced? Question 5 Explain why, tall chimneys are installed in factories? Question 6 Why do traffic policeman often wear mask at a crowded … [Read more...] about Carbon Dioxide, Water Vapours and Smoke
Oxygen and Nitrogen
Question 1 State few properties of Nitrogen? Question 2 State few properties of oxygen? Question 3 Why do mountaineers carry oxygen cylinders with them while climbing high mountains? Question 4 How will you show that oxygen or air is necessary for burning? Question 5 Explain why ,if the clothes of a person catches fire accidentally, he is covered with a woollen … [Read more...] about Oxygen and Nitrogen
Composition of Air
Question 1 What is air? State the composition of air? Question 2 Write few properties of air? Question 3 Describe an activity to show that a glass bottle which appears to be empty to us is actually filled with air? Question 4 How will you show that air is a mixture of gases? Question 5 What is atmosphere? Question 6 Why do mountaineers carry oxygen cylinders with … [Read more...] about Composition of Air