Page 114 - General and Inorganic Chemistry for Advanced Secondary Schools Students Book Form Five and Six

Biology for Secondary Schools

causing pain, small wounds and which cause sleeping sickness to
blisters. human beings. In addition, white
(b) Some arthropods destroy crops flies carry tomato yellow leaf curl
and other properties. For example, virus which causes chlorosis in
burrowing diplopods can cause plants.
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some damage to the roots or (e) Some arthropods are parasites to
germinating seeds, mites attack mammals and other vertebrates.
food crops (on farm and in storage) For examples ticks, jiggers, and
and timber. bedbugs.
(c) Some arthropods, such as scorpion,
wasps and bees can cause painful Phylum Chordata
bites and stings. Stinging insects This phylum comprises animals with
that live in colonies can cause a high degree of body organisation.
significant injury and even death. The majority of animals under this
(d) Some insects are vectors of animal phylum have a supporting column of
and plant diseases. For example, bones known as backbone or vertebral
mosquitoes carry Plasmodium column.
spp. which cause malaria and Examples of chordates are shown in
tsetse flies carry Trypanosoma spp. Figure 5.33.

Figure 5.33: Examples of chordates (a) fish (b) frog (c) lizard (d) chicken (e) mouse

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