Page 101 - General and Inorganic Chemistry for Advanced Secondary Schools Students Book Form Five and Six
P. 101
Biology for Secondary Schools
Advantages of angiosperms (c) Some angiosperms, such as star
(a) Angiosperms are important for grass are weed plants, which
the survival of humans and other compete with food crops leading
animals. For humans, angiosperms to reduction of crop yield. Others
provide foods, such as beans, rice, are parasites to other plant species.
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maize, sugarcane, and oranges. For example, parasitic weeds in
Some members of the grass family crops, such as mango, orange and
are used as food for livestock. cashew nut trees, and they cause
(b) They are habitat to many insects, serious loss of crop yield.
birds and other animals. (d) Some aquatic angiosperms, such
(c) Different species of as water hyacinth can colonise
Angiospermatophyta are used water bodies and affect the
as medicine for treating various ecosystem as well as hindering
diseases. fishing activities.
(d) Some angiosperms, such as
cotton, flax, and hemp provide Kingdom Animalia
fibres that are raw materials in Task 5.9
textile industries. Read from reliable internet sources and
(e) Angiosperms form ground cover biology books the information about
which prevents soil erosion.
(f) Some plants such as roses, lilies, kingdom Animalia.
and hibiscus make the environment Kingdom Animalia comprises wide
attractive. varieties of animals. Animals vary
(g) They provide varieties of wood greatly in their structure, morphology
for furniture, paper, and building and the way their bodies function.
materials. Kingdom Animalia includes worms,
insects, and higher animals. They are
Disadvantages of angiosperms found in various habitats, such as on
(a) Some angiosperms such as thorn land, in oceans, and in freshwater.
apple, oleander, and milkweed
are poisonous. When eaten by General characteristics of animals
humans and other animals as they (a) They are eukaryotes; therefore, they
may cause death. possess a clearly defined nucleus
(b) Drugs derived from some and their cells have membrane
angiosperms can be dangerous. bound organelles.
For example, tobacco and caffeine (b) They are multicellular, that means
can be addictive. they are made up of more than one
cell.
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