Complete- has all four floral structures (sepals, petals, stamens and pistils).
Perfect- has both sexual parts (stamens and pistils).
Regular - has petals that are all similar in size and shape as are its sepals.
Hypogenous- has ovary sets above the sepals - the ovary is superior.
In many plant species, the carpels may be fused, making several combinations possible.
The ovary may consist of one or more chambers or locules which contain one or more undeveloped seeds, the ovules. The area of the ovary wall where the ovules are attached is called the placenta. The arrangement of the placenta varies in different species.
Plants like peas have a pistil consisting of a single carpel, the placenta occurs on the ovary wall opposite the main vein. In flowers where the pistil consists of more than one fused carpel the situation is more complex.
The ovary may have only one chamber despite consisting of several fused carpels. This central placenta is known as free central placentation
Parts of a Flower Activity
http://www.bbc.co.uk/schools/ks2bitesize/science/living_things/life_cycles/play.shtml
Red Onion Lab
Osmosis in Red Onion Cells You Tube Video
http://www.youtube.com/watch?v=nHWUAdkYq4Q
Onion Cell Plasmolysis Cartoon
http://www.phschool.com/science/biology_place/labbench/lab1/ex4and5.html
The cell contents of red onion cells contract in high concentrations of salt water and expand in distilled/tap water
Osmosis is a specialized case of diffusion that involves the passive transport of water. In osmosis water moves through a selectively permeable membrane from a region of its higher concentration to a region of its lower concentration. The membrane selectively allows passage of certain types of molecules while restricting the movement of others.
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