YY 發問於 科學及數學其他 - 科學 · 1 十年前

about reproduction of flowering plants ~

excues me , what kinds of plants need to disperse their seeds ==

by water

by wind

by explosion

Thanks a lot ~

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  • Gemini
    Lv 4
    1 十年前
    最愛解答

    Reproduction in Flowering Plants

    The Parts of a Flower

    Most flowers have four parts:

    sepals,

    petals,

    stamens,

    carpels.

    The parts of a flower

    Sepals protect the bud until it opens.

    Petals attract insects.

    Stamens make pollen.

    Carpels grow into fruits which contain the seeds.

    Stamen (male)

    Anther: pollen grains grow in the anther.

    When the grains are fully grown, the anther splits open.

    Pistil (female)

    Stigma

    Style

    Carpel (ovary)

    Ovules (eggs)

    Pollination

    Flowering plants use the wind, insects, bats, birds and mammals to transfer pollen from the male (stamen) part of the flower to the female (stigma) part of the flower.

    Pollination

    A flower is pollinated when a pollen grain lands on its stigma.

    Each carpel grows into a fruit which contains the seeds.

    Fertilisation

    Pollen grains germinate on the stigma, growing down the style to reach an ovule.

    Fertilised ovules develop into seeds.

    The carpel enlarges to form the flesh of the fruit and to protect the ovary.

    Wind pollination

    Some flowers, such as grasses, do not have brightly coloured petals and nectar to attract insects.

    They do have stamens and carpels.

    These flowers are pollinated by the wind.

    Seed dispersal

    Seeds are dispersed in many different ways:

    Wind

    Explosion

    Water

    Animals

    Birds

    Scatter

    How birds and animals help seed dispersal

    Some seeds are hidden in the ground as a winter store.

    Some fruits have hooks on them and cling to fur or clothes.

    How birds and animals help seed dispersal

    Birds and animals eat the fruits and excrete the seeds away from the parent plant.

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