1What is excretion, and why does it matter that waste is made inside the body?
2Describe excretion in plants.
3Why do plants have no special excretory organs? Give the real reason, not just that they are simpler.
4How does excretion take place in a unicellular animal?
5Give a short description of excretion in the human body.
6What is the difference between excretion in animals and in plants?
7Where do the water drops on the edges of leaves in the early morning come from?
8Is undigested food leaving the body an example of excretion? Explain.
9Why must a kidney be connected to the blood supply?
10In Activity 5.2, why is it worth tying up a second empty bag as well?