1. How would you show that air is needed for combustion ? 2. Why earthworms are seen during rainy season? 3. Why do mountaineers carry oxgyen cylinder? 4. What is respiration? Is respiration same as photosynthesis? 5. Why do we see water drops on the outer surface of a glass containing ice?
Class 6th
Answers
(1) We need a burning candle. Now put an another glass on the candle. We will see that candle has stop burning now. This shows that candle is needed for burning.
(2) Earthworms are seen during rainy seasons because they need oxygen to breath when they are in soil but during rainy season soil gets filled with water. So, they have to come to the above surface of soil to get the required oxygen.
(3) The carry oxygen cylinder because there is low pressure on the mountains but there is need to maintain a person's body pressure and outer pressure, otherwise it starts bleeding. So, they have to carry oxygen cylinder.
(4) Respiration is process of taking in oxygen and giving out carbon-dioxide.
No, respiration is Not same as photosynthesis.
(5) We see it because there is difference between outer and inner temperature of glass. Thus, Air outside the glass gets cooled and forms drops of water that we see on the outer surface of the glass.