1What is respiration? Write the chemical process in short.
2Is breathing the same as respiration? Explain the difference.
3Do plants respire? If they give out oxygen, how can they also give out carbon dioxide?
4In Activity 5.5, why did the limewater turn milky?
5Why does Activity 5.5 use germinating seeds rather than a green leaf?
6Why does the body become weak after a long time without food, and why do you feel hungry a couple of hours after eating?
7Write the difference between respiration in an insect and in a fish.
8Describe respiration in the human body.
9Explain how both panting and heartbeat increase when we run.
10Why is a lung divided into countless tiny alveoli instead of being one large empty bag?