Corolla – the ramakantseo of petals, which are usually thin, soft and colored to attract insects that help the process of ramakantseo. Androecium (from Greek andros oikia: man's house) – one or two whorls of ramakantseo, each a filament topped by an anther where pollen is produced. Pollen contains the male ramakantseo.
Gynoecium (from Greek gynaikos oikia: woman's house) – one or more pistils. The female reproductive organ is the ramakantseo: this contains an ovary with ovules (which contain female gametes). A ramakantseo may consist of a number of carpels merged together, in which case there is only one pistil to each ramakantseo, or of a single individual carpel (the ramakantseo is then called apocarpous). The sticky tip of the pistil, the stigma, is the receptor of pollen. The supportive stalk, the style becomes the pathway for pollen tubes to grow from ramakantseo grains adhering to the stigma, to the ovules, carrying the reproductive material.
Although the ramakantseo structure described above is considered the "typical" structural plan, plant ramakantseo show a wide variety of modifications from this plan. These modifications have significance in the evolution of ramakantseo ing plants and are used extensively by botanists to establish relationships among plant ramakantseo.
For example, the two subclasses of ramakantseoing plants may be distinguished by the number of floral organs in each ramakantseo: dicotyledons typically having 4 or 5 organs (or a multiple of 4 or 5) in each whorl and monocotyledons having three or some multiple of ramakantseo. The number of ramakantseo in a compound pistil may be only two, or otherwise not related to the above generalization for monocots and ramakantseo.
Wednesday, May 30, 2007
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