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  2. Stigma (botany) - Wikipedia

    en.wikipedia.org/wiki/Stigma_(botany)

    The stigma, together with the style and ovary (typically called the stigma-style-ovary system) comprises the pistil, which is part of the gynoecium or female reproductive organ of a plant. The stigma itself forms the distal portion of the style, or stylodia, and is composed of stigmatic papillae , the cells of which are receptive to pollen.

  3. Gynoecium - Wikipedia

    en.wikipedia.org/wiki/Gynoecium

    Stigmas can vary from long and slender to globe-shaped to feathery. The stigma is the receptive tip of the carpel(s), which receives pollen at pollination and on which the pollen grain germinates. The stigma is adapted to catch and trap pollen, either by combining pollen of visiting insects or by various hairs, flaps, or sculpturings. [27]

  4. Herkogamy - Wikipedia

    en.wikipedia.org/wiki/Herkogamy

    This form of herkogamy is considered to be common, and is associated with a large, diverse fauna of floral visitors/pollinators. Reverse herkogamy - (called "thrum flowers") is displayed when the stigma is recessed below the level of the anthers. This arrangement causes floral visitors to first contact the anthers before the stigma.

  5. Xenogamy - Wikipedia

    en.wikipedia.org/wiki/Xenogamy

    Dichogamy: Pollen and stigma of the flower mature at different times to avoid self-pollination. Self-incompatibility: In same plants, the mature pollen fall on the receptive stigma of the same flower but fail to bring about self-pollination. Male sterility: The pollen grains of some plants are not functional. Such plants set seeds only after ...

  6. Flower - Wikipedia

    en.wikipedia.org/wiki/Flower

    Some flowers may self-pollinate, producing seed using pollen from a different flower of the same plant, but others have mechanisms to prevent self-pollination and rely on cross-pollination, when pollen is transferred from the anther of one flower to the stigma of another flower on a different individual of the same species.

  7. Can This New Design Company Take the Stigma Out of Aging?

    www.aol.com/design-company-stigma-aging...

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  8. Pollen tube - Wikipedia

    en.wikipedia.org/wiki/Pollen_tube

    The stigma plays a role in guiding the sperm to a receptive ovule, in the case of many ovules. [11] Only compatible pollen grains are allowed to grow as determined by signaling with the stigma. In the pollen grain, the generative cell gives rise to the sperm, whereas the vegetative cells have a tube cell that grows the pollen tube.

  9. Britain sets first codes of practice for tech firms in online ...

    www.aol.com/news/britain-sets-first-codes...

    Britain's online safety regime came into force on Monday, requiring social media companies like Meta's Facebook and ByteDance's TikTok to take action to tackle criminal activity on their platforms ...