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Sexual Reproduction in Flowering Plants (Pollination (2 types of…
Sexual Reproduction in Flowering Plants
Pollination
The transfer of pollens from anther to stigma. They must be from the same species.
2 types of pollination
cross pollination
Involve 2 separate flowers
can be both perfect or imperfect
self-pollination
Involve only 1 flower
Must be perfect flower
Pollens need help to travel
Wind
Animals (pollinators)
E.g bees, butteflies, hummingbird
scent
sweet
negative smell / stench
brightly coloured petals
to attract pollinators
Big petals
So that can be seen clearly. Allow pollinators to land easily.
Reproductive parts are hidden in the petals
pollinators have to crawl in and will be closer to anther/stigma
increase success of pollination
Examples of pollinators; bees,, butterflies, hummingbirds
Wind Pollination
don't have brightly coloured petals
no scent
usually have small petals
Reproductive parts are protruding out
so that petals are not blocking the anther/stigma
Wind pollinated flower
Animal pollinated flower
Sweet scent
brightly coloured petals
reproductive parts hidden inside petals
Fertilisation
Flower to fruits
Seed Dispersal
Germination
Parts of flowers
2 types of flowers
Perfect
1 flower with 2 gender (has both male & female parts)
Imperfect
1 flower with 1 gender (male and female parts found in separate flowers)
Male
Stamen (Anther & Filament)
Anther - produce pollens (contain male reproductive cells)
Female
Pistils (Stigma, Style, Ovary, Ovules)
Stigma - trap pollens
Ovary - produce egg cells