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WEEK 4
BIOLOGY
TOPIC: REPRODUCTIVE SYSTEMS IN PLANTS
CONTENT:
SUB-TOPIC 1: Structures and functions of the reproductive organs of plants.
The flower is the major reproductive organ of the flowering plant. Flowers exist in different sizes, shapes, colours and patterns of arrangements.
A flower is a cluster of modified leaves carried on a reduced stem called flower stalk or pedicel. The flower is made up of four floral parts. These are;
(i) Sepals (calyx)
(ii) Petals (corolla)
(iii) Stamen (androecium)
(iv) Carpel (gynoecium)
The structures and their functions are as listed below:
Androecium: this consists of the whorls or group of the male reproductive organs of the flower called stamens. These lie inside the corolla. Each stamen is made up of a lobed or swollen head called Anther and a long slender stalk called the filament which bears the Anther. Each anther is composed of four pollen grains (the male gametes) flowers may be free or united. The filament may also be united while the anthers are free. The fused filaments from a stamina tube as in hibiscus. In sunflower, the anthers are fused while the filaments are attached like petals (epipetalous).
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