Answer the following:
1. Give two examples each for the three states of matter.
A. Solid: Stone, table
Liquid: Water, milk
Gas: oxygen, air
2. List the gases found in air.
A. Nitrogen, oxygen, carbon dioxide, water vapour
3. Which gas is necessary for the water cycle?
A. Water vapour in the air is necessary for water cycle.
4. Which organs do frogs breathe through?
A. Frogs breathe through lungs when on land and through moist skin when in water.
5. What are spiracles?
A. The tiny pores on insects body through which they breathe is called spiracles.
6. How do humans breathe?
A. Humans breathe through lungs. We inhale through nose, air reaches the lungs. In lungs oxygen is absorbed and carbon dioxide is exhaled.