Page 100 - General and Inorganic Chemistry for Advanced Secondary Schools Students Book Form Five and Six
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Biology for Secondary Schools
Class Dicotyledoneae (b) Dicot leaves have net-like venation.
This class contains plants with two See Figure 5.24 (b).
cotyledons. Examples are beans, (c) Their stems have vascular bundles
mangoes, coffee, groundnuts and which appear in a ring form, as
sunflower plants. shown in Figure 5.25 (a).
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(d) They have tap root system, as shown
Distinctive features of the class in Figure 5.25 (b).
Dicotyledoneae (e) Their seed embryo has two
(a) Floral parts are normally in four or cotyledons.
five, or multiples of four or five. See (f) Dicot plants have petioles that
Figure 5.24 (a). support the leaf.
(g) They have short and broad leaves.
Figure 5.24: Dicot plant (a) floral arrangement (b) network leaf venation
(a)
(b)
Figure 5.25: (a) vascular bundle in ring form in stem
(b) tap root system
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