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Reproduction in Flowering Plants

Reproduction in Flowering Plants

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Reproduction in Flowering Plants

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  1. Reproduction in Flowering Plants WALT – Explain how plants reproduce Sexually Mr. Stuart Living Environment

  2. Identify and draw, using a hand lens if necessary, the • sepals, • petals, • stamens, • anthers, carpels, • ovaries and • stigmas of one, locally available, named, insect-pollinated, dicotyledonous flower,

  3. Sexual Reproduction • Using the gametes from 2 parents to produce genetically unique individuals

  4. Flower • Sexual reproductive structure • Produces egg and sperm • Fertilization takes place inside the flower

  5. Which is the most accurate statement? The principal role of a flower in the life cycle of a plant is: • (a) attracting insects • (b) producing seeds • (c) producing pollen • (d) producing nectar

  6. Pistil/ Carpel *Stigma –top of the carpel, Sticky surface for pollen to stick to *Style – connects the stigma to the ovary *Ovary –contains ovules ( eggs) Stamen *Anther –produces sperm nuclei by meiosis. Sperm nuclei are enclosed by pollen grains. *Filament – holds the anther up Female reproductive organ Male reproductive organ

  7. Female • Male Pistel = many Carpels • What features of flowers might attract insects? • Which part of the flowers become a the seed and be the fruit?

  8. Draw an accurate diagram of a flower and include both Male/ Female Organs • Pg 67 http://www.bbc.co.uk/bitesize/standard/biology/world_of_plants/growing_plants/revision/4/

  9. Pollination

  10. PollinationWALT – • Explain the Transfer of mature pollen grains from the anther to the stigma using -wind -insects -birds & other animals

  11. Name the agents of pollination • Compare the different structural adaptations of • insect-pollinated and wind-pollinated flowers • Describe the growth of the pollen tube and its entry into the ovule followed by fertilisation (production of endosperm and details of development are not required)

  12. and examine the pollen grains under a light microscope or in photomicrographs

  13. Pollination as the transfer of pollen grains from the male part of the plant (anther of stamen) to the female part of the plant (stigma)

  14. Draw in your books • Cross Pollination

  15. *Self pollination –pollen from same flower*Cross pollination – pollen from a different flower - more variation

  16. Because nature doesn’t like self pollination, often it is rejected

  17. When a pollen grain lands on the stigma, it sticks and a pollen tube grows down through the style to an ovule (egg)

  18. Wind v Insect Pollination • Wind pollinated flowers are different in structure from insect pollinated ones. • [You need to be able to explain the main differences. This table will help to make these clear for you] Insect pollinated flowers - rose sweet pea Wind pollinated flowers - ragweed

  19. Use the information on pg 21-22 – Wind Pollinated Plants to help you fill the table in

  20. Fertilization • The sperm travels through the pollen tube to the ovule. The sperm & egg fuse forming the zygote (fertilized egg) –this grows into the plant embryo (cells grow by mitosis)

  21. The ovary and zygote (fertilized ovule) develop and ripen. *The ovule forms the seed and the ovary forms the fruit. • A fruit is a ripened ovary

  22. Germnination WALT – Understand the process of germination

  23. The plant embryo uses food stored in the cotyledon of the seed until it develops leaves for photosynthesis

  24. Cotyledon – Leaf inside seed that supplies food to growing embryo

  25. Seedling micropyle –opening in ovule where pollen tube attached and sperm enteredhilum –scar where ovule attached to ovaryradicle –embryonic root

  26. Epicotyl – grows above the cotyledons and gives rise to the leaves. Hypocotyl –below the point of attachment of the cotyledon, develops into the stem.

  27. Seed coat Hypocotyl Epicotyl Cotyledons Endosperm Seed coat Epicotyl Hypocotyl Cotyledon Radicle Parts of a seed • Dicot • Monocot

  28. Monocot Dicot Epigeous Hypogeous Radicle Seed Germination

  29. This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com Is home to well over a thousand powerpoints submitted by teachers. This a free site. Please visit and I hope it will help in your teaching