Page 103 - General and Inorganic Chemistry for Advanced Secondary Schools Students Book Form Five and Six

Biology for Secondary Schools

covered in this section. These are: (e) Phylum Chordata includes
(a) Phylum Platyhelminthes includes advanced organisms, such as human
pork tapeworm (Taenia solium), beings, cattle, fish, chicken, frogs
beef tapeworm (Taenia saginata), and snakes.
liver flukes (Fasciola species), blood
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flukes (Schistosoma species) and Phylum Platyhelminthes
planaria.
(b) Phylum Nematoda, formerly known Task 5.10
as Aschelminthes, includes ascaris, From reliable internet sources, library
hookworms and filarial worms. and biology books read the examples
(c) Phylum Annelida includes of flatworms and their characteristics.
earthworms, leeches and their
marine relatives, such as ragworms Members of the phylum
Platyhelminthes are the flatworms and
and lugworms. are commonly called platyhelminths.
(d) Phylum Arthropoda includes prawns, They can be free living or parasites.
crabs, ticks, spiders, butterflies and Figure 5.26 shows examples of
cockroaches. platyhelminths.

(a) (b) (c)
Figure 5.26: Examples of platyhelminths (a) liver fluke (b) beef tapeworm (c) pork
tapeworm

Activity 5.12: Observing the external features of the flatworms

Materials: Preserved specimens of tapeworm, liver fluke, petri dishes, forceps,
hand lens, notebook and pencil

Procedure
1. Using forceps pick a liver fluke, and tapeworm from preserving containers
and put each in different petri dishes.
2. Using a hand lens, carefully observe and identify the following external
structures (if any): the mouth, suckers, body shape and the posterior
region of the organism.
3. Describe each specimen.

Student’s Book Form One Student’s Book Form One 97

15/10/2024 09:24:34
Biology FORM 1 new.indd 97
Biology FORM 1 new.indd 97 15/10/2024 09:24:34