Annelids and Lab 2
Answers are for parents and teachers.
1
Compare the earthworm and the planarian: circulation, body cavity, anus.
The earthworm has a closed circulatory system, body cavity and anus; the planarian has none of these.
2
Describe the worm’s movement in 4 steps.
Circular muscles contract → thin front end enters soil → longitudinal muscles contract → rear is pulled up; bristles give support.
3
What is vermicompost and how is it made?
Worms process livestock and household waste; the resulting valuable fertiliser is vermicompost.
4
Name the 3 classes of annelids and one representative of each.
Polychaetes – nereis; oligochaetes – earthworm; leeches – medicinal leech.
5
Write 3 safety/ethics rules for working with a live worm.
Do not hurt or prick it; wash hands afterwards; return it to the soil.