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Published byFelicity Barber Modified over 7 years ago
Reproduction in Flowering Plants
The Parts of a Flower Most flowers have four parts: ( Leave Space for definition between each ) –sepals, –petals, –stamens, –carpels.
The parts of a flower Sepals protect the bud until it opens. Petals attract insects. Stamens make pollen (male gamete). 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. –Filament- supports the Anther
Pistil/Carpel (female) Stigma- pollen sticks here Style- supports the stigma Ovary- protects the eggs. Ovules (eggs)
Pollination Transfer pollen from the male (stamen) to the female (stigma) part of the flower. o Pollination can be assisted by insects, bats, birds or mammals.
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.
Fertilization Pollen grains germinate on the stigma A pollen tube grows down the style to reach an ovule. Fertilized ovules develop into seeds. The ovary enlarges to form the flesh of the fruit and to protect the seeds.
Seed dispersal Seeds are dispersed in many different ways, so that young do not have to grow next to large stationary parents.
Wind &Water Seed Dispersal Some seed coats and fruits have adapted for wind dispersal Others use water – coconut is hollow allowing to float
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.
Germination Germination is the resumption of growth of the embryo plant inside the seed Plant embryos are protected in the seed and may remain dormant until conditions for growth are present. The embryo feeds on endosperm in the seed (which is a form of food).
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