Within an Angisperm's body there are four main principal organ systems: leaves, stems, roots and flowers, all in which play a pivotal role in the existence of angiosperms. Within these four, the flower organ's main function is to attract a pollinator. In order to do this a flower may present itself as being very beautiful looking. It might have a certain colour that attracts a certain insect or it might give off a certain smell. The flower has a modified shoot with 4 rings of modified leaves. The first level is the sepal, then comes the petals, stamens (male) and the carpel (female). The flower also has a stigma which is a structure that receives the pollen and is also the structure in which the pollen grain germinates. The style is a long, slender stalk that connects the stigma to the ovary. The stigma is at the top and the ovary is towards the bottom. The ovary is the female reproductive gland. All three of these structures (stigma, style ovary) are apart of the carpal of the leaf. The male reproductive part of a flower is called the stamen. It is composed of a long tube, called a filament and has a pollen-producing structure on the end. This oval-shaped structure is called the anther. It is very important in the process of reproduction of flowering plants, as it produces the male gametophyte, known as pollen.
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