Page 109 - General and Inorganic Chemistry for Advanced Secondary Schools Students Book Form Five and Six

Biology for Secondary Schools

Activity 5.14: Observing external fea- 3. Identify its external features,
tures of the earthworm including its mouth, anus, clitellum,
and chaeta. Compare the observed
Materials: Preserved or live specimen features with those depicted in
of earthworm, hand lens, petri dish, Figure 5.31.
FOR ONLINE READING ONLY
notebook, pencil, and forceps

Questions
Procedure (a) How are the earthworms adapted
1. Using forceps, pick an earthworm to their environment?
from a preserving container and (b) Explain two features that distinguish
put it in a petri dish.
2. Using a hand lens, observe the earthworms from round worms.
specimen carefully to identify its
external features.

Figure 5.31: External structure of the earthworm

Advantages of annelids
(a) Some annelids improve soil aeration through burrowing and mixing up of
soil layers. Earthworms play important role in improving soil aeration, hence
maintaining soil fertility.
(b) They are used for commercial production of compost manure in the process
known as vermicomposting.

Student’s Book Form One Student’s Book Form One 103

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