Sexual Reproduction in Plants

Manraj Bhandal
Mind Map by Manraj Bhandal, updated more than 1 year ago
Manraj Bhandal
Created by Manraj Bhandal almost 5 years ago


Discusses parts of the plant, pollenation, fertilisation, and seeds

Resource summary

Sexual Reproduction in Plants
1 Parts and Stucture of the Flower
1.1 Carpel - female
1.1.1 Stigma Where the pollen grain lands in pollenation
1.1.2 Style Holds the stigma high and firm
1.1.3 Ovary Holds ovules, becomes fruit after fertilisation Ovule contains female gamete
1.2 Stamen - male
1.2.1 Anther Made up of pollen sacs, where pollen is made Pollen contains the male gamete
1.2.2 Filament Holds up the anther
1.3 Other
1.3.1 Petal Attracts insects for pollination (in insect pollinated plants)
1.3.2 Sepal Protects the plant whilst it is in a bud
1.3.3 Nectary Produces sugary nectar that attracts insects for pollination (in insect pollinated plants)
2 Pollination
2.1 Self pollination
2.1.1 When pollen of the same plant begins fertilisation with the stigma of the same plant, this is avoided by different maturing times, or by position of the anther to the stigma
2.2 Cross pollination
2.2.1 When pollen from one plant reaches the stigma of another plant, this is prefered as it increases variation
2.3 Insect Pollination
2.3.1 Insect used to spread pollen for anther of one plant to stigma of another Large, bright flowers Scented Nectar Large, rough, but just a little amount of pollen Anther and stigma inside flower so that insect touches them
2.4 Wind Polination
2.4.1 Wind used to disperse pollen from one anther to another stigma No nectar or scent Small, green petals Lots of light pollen Feathery anthers and stigmas out of the flower to catch and release pollen
3 Fertilisation
3.1 A pollen tube grows from the pollen landing onto the stigma and grows down the style, into the ovary
3.1.1 There are 8 haploid nuclei in the ovary including the egg cell and 2 nuclei in the central cell One male nucleus fuses with the two nuclei from the central cell to form a triploid endosperm cell The endosperm develops into a food store for the seedling One male nucleus fuses with the egg cell to form a diploid zygote The ovule develops into a seed The zygote becomes the plant embryo
4 Seeds
4.1 Dispersal
4.1.1 Animal Seeds dispersed in fruit eaten by animal, then planted elsewhere
4.1.2 Wind Seeds have wings and glide elsewhere in the wind
4.1.3 Mechanical Seeds in pods that burst open, sending the seed elsewhere
4.1.4 Water Buoyant seeds travel on water
4.2 Germination
4.2.1 When the conditons are correct, the seedling will begin to grow Oxygen Warmth Water
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