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- The stigma is a swollen, knob-like structure. It can be either hairy or sticky, or sometimes both to trap pollen grains. In wind-pollinated flowers, like grasses, it may be feathery and branched or elongated. However, for some other flowers, it may be compact and has a sticky surface.
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The stigma is fixed to the apex of the style, a narrow upward extension of the ovary. The stigma (pl.: stigmas or stigmata) [1] is the receptive tip of a carpel, or of several fused carpels, in the gynoecium of a flower.
The characteristics of stigmas are vital for plant reproduction as they directly influence pollination success and genetic diversity. By having varied stigma shapes, sizes, and textures, plants can attract specific pollinators or increase compatibility with particular pollen types.
- Sepals. Sepals are modified leaves that typically function as protection for the flower in bud and often as support for the petals when in bloom. They are sterile floral parts and may be either green or leaf-like or composed of petal-like tissue.
- Petals. Petals are modified leaves that surround the reproductive parts of flowers. They are often brightly colored or unusually shaped to attract pollinators.
- Stamens. Stamen can be described as the male reproductive part of a flower. In all but a few extant angiosperms, the stamen consists of a long slender stalk, the filament, with a two-lobed anther at the tip.
- Carpel. The pistils of a flower are considered to be composed of one or more carpels. A carpel is the female reproductive part of the flower —composed of ovary, style, and stigma— and usually interpreted as modified leaves that bear structures called ovules, inside which egg cells ultimately form.
Key learning points. Flowers play an important part in the life cycle of a flowering plant. The anther is a part of the stamen that produces and holds the dusty pollen. Anthers are male parts of the flower. The stigma is a female part of the flower and is sticky. The ovary is where seeds are formed.
Mar 13, 2023 · The stigma features a flat surface with a sticky texture, that is ideal for capturing pollen that has been transported to the stigma of the flower by wind or pollinating insects and birds. Upon arriving on the stigma, pollen will germinate to produce a pollen tube down the style.
Explain cross-pollination and the ways in which it takes place. Describe the process that leads to the development of a seed. Define double fertilization. In angiosperms, pollination is defined as the placement or transfer of pollen from the anther to the stigma of the same flower or another flower.
