Problem Solving Task: Do the following in NB-2
1) Explain the mechanism of breathing in humans.
2) Explain how plants respire.
3) Give the difference in the composition of air being inhaled and exhaled.
4) Why do whales and dolphins come up to the surface of the sea water?
[Time: 20 minutes MI: Logical RBT: Analysis]
Textual Exercise : Complete Q. 1-4 in NB2.