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10T6 - Plant Reproduction - Coggle Diagram
10T6 - Plant Reproduction
Structure of wind-pollinated plants
Petals - small and dull - usually green or brown
Nectar - no scent or nectar
Pollen grains - smooth and light so they can be easily carried in the wind and in large amounts to make sure some reach other flowers
Anthers - Outside flower, loose on long filaments so that pollen can be released easily
Outside flower, feather so forms network to catch pollen grains drifting in the wind
Structure of insect-pollinated plants
Petals - large and bright to attract insects
Nectar - scented with nectar to attract insects
Pollen grains - sticky and in moderate amounts
Anthers - inside flower, stiff and attached so that insects can brush past
Stigma - Inside flower, sticky so pollen grains stick to it when an insect brushes past
Asexual reproduction
Natural method such as runners - plants grow horizontally over soil surface and put down roots to form new plants
Artificial methods such as cuttings - tissue samples scraped from parent plan and them placed in agar growth medium with nutrients and auxins - the sample develop into plantlets and these are planted in compost to grow further
Germinating seeds utilise food reserves until the seedling can carry out photosynthesis
Seed and fruit formation
1) Pollen grains land on the stigma
2) Pollen tube grows out of the pollen grain and down the style into the ovary and then to the ovule
3) The male nucleus travels down the pollen tube from the pollen grain to fuse with the female egg nucleus in the ovule, forming a zygote
4) the zygote undergoes mitosis to form a seed
5) The ovule will become the seed and the ovule wall will become the seed coat
6) The ovary will become the fruit of the plant