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Sexual Reproduction in Plant, Biology_WRP, Part 2 - Coggle Diagram
Sexual Reproduction in Plant, Biology_WRP, Part 2
Fertilisation:
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In all living organisms, fertilisation happens when the male sex cell and female sex cell meet and join, and the nuclei fuse.
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Germination:
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The radicle grows first and bursts though the Testa. It continues to grow downwards, pushing it's way through the soil.
Branches, called lateral roots, grow out from the side of the main root and help to anchor it firmly to the ground.
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Hypocotyl (region above the radicle) starts to elongate. It moves upwards, pulling the cotyledons with it.
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Once the leaves develop, the cotyledons fall off as the leaves absorb sunlight and make their own food by photosynthesis.
The importance of temperature, water and oxygen in germination:
Water:
When the seeds are dehydrated, the metabolism is very slow.
Water is absorbed though the micropyle, and then through the whole seed coat.
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Temperature:
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At too low temperatures, germinations might not start at all.
Oxygen:
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As the Testa splits up, it allows oxygen to enter. This oxygen is used in aerobic respiration (Energy released is used for chemical changes).