Biology Module 3 - 2.sexual reproduction in flowering plants 2.8 discuss the development of the seed and the fruit from the embryo sac and its contents to ovule and ovary

2.8 discuss the development of the seed and the fruit from the embryo sac and its contents to ovule and ovary

Once fertilization occurs zygote divides by mitosis to form an embryo. The embryo obtains water, sucrose and ions from xylem and phloem through the endosperm

• embryo continues to divide to form a plumule (embryonic shoot) and radicle (embryonic root)  and one or two cotyledons

• as embryo gets larger nucellus gets squashed and

Biology Module 3 - 2.sexual reproduction in flowering plants 2.7 explain the significance of double fertilization

2.7 explain the significance of double fertilization

The significance is that double fertilization results in the formation of a triploid endosperm. 

This triploid endosperm nucleus then divides by mitosis to give a tissue that surrounds the developing embryo.

Biology Module 3 - 2.sexual reproduction in flowering plants 2.6 explain the sequence of events from pollination to fertilization

2.6 explain the sequence of events from pollination to fertilization. diagrams required


diagram of fertilization

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• Pollination - pollen grains land on stigma which they then absorb water and sucrose and germinate

Biology module 3 - 2.sexual reproduction in flowering plants 2.5 discuss the genetic consequence of sexual reproduction

2.5 discuss the genetic consequence of sexual reproduction. Include cross fertilization and self fertilization

 
Self pollination

• self pollination leads to self fertilization where gametes come from the same plant and is the most extreme form of inbreeding

• there will be some variation since in meiosis there is random combination of genes and it is not the same meiosis that produces the pollen grain nuclei and female gamete nucleus

Biology module 3 - 2.sexual reproduction in flowering plants 2.4 explain how cross fertilization is promoted

2.4 explain how cross fertilization is promoted

Pollination is the transfer of pollen grains from the anther to stigma.

Self pollination - transfer of pollen grains from the anther of a flower to a stigma of the same flower or different flower on the same plant.

Cross pollination - the transfer of pollen grain from the anther of a flower on one plant to the stigma of a flower on another plant of the same species.

Biology module 3 - 2.sexual reproduction in flowering plants 2.2 describe the structure of the ovule and the formation of embryo sac

2.2 describe the structure of the ovule and the formation of embryo sac

diagram ovule 

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Ovum (Egg) - female gamete

Biology module 3 - 2.sexual reproduction in flowering plants 2.1 describe the structure of the anther and the formation of pollen grains

2.1 describe the structure of the anther and the formation of pollen grains

Diagram of anther

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Vascular bundle - transport water and nutrients to anther