Page 170 - Biology_F5

Comparative studies of natural groups of organisms

(a) Activity 3.10: Observation and
recording flower structures
Materials
Corolla Hibiscus flower, common bean flower,
maize flower and elephant grass flower,
Stamens Calyx hand lens, and surgical or razor blade
FOR ONLINE READING ONLY
Stigma Epicalyx
Pedicel Procedure
(a) Collect two flowers from each of
Leaf
the following plants; Hibiscus,
common bean, maize, and elephant
grass.
(b) Carefully observe each flower using
(b) a hand lens and state with evidence

Corolla the classes to which each of the four
plant species belongs.

(c) Use a surgical or razor blade to
make a transverse section of each
Style flower and examine its parts.
(d) Describe a transverse section of each
Ovary Calyx flower and state their symmetry.

Pedicel Epicalyx (e) Prepare a longitudinal section of the
second flower for each plant and

(c) make description for each.
(f) Write the floral formulae of bean,
elephant grass, and maize flowers.
(g) From your observation, what features
do the four flowers have in common?

(h) Explain the main differences
between the Hibiscus flower and grass
flowers.

Figure 3.41: Hibiscus flower (a) vegetative Safety precaution
morphology (b) half flower diagram (c) floral Be careful when collecting flowers
diagram
using surgical or razor blades. Flower's
pollen may contain allegens and the
elephant grass hairs can cause pain.

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