7. Reproduction in flowering plants - Part 2

4,311 views

Published on

Published in: Education, Technology, Business
0 Comments
4 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
4,311
On SlideShare
0
From Embeds
0
Number of Embeds
1,199
Actions
Shares
0
Downloads
147
Comments
0
Likes
4
Embeds 0
No embeds

No notes for slide

7. Reproduction in flowering plants - Part 2

  1. 1. Reproduction in Flowering Plants
  2. 2. Flower • Sexual reproductive structure • Produces egg and sperm • Fertilization takes place inside the flower
  3. 3. Pollen is produced in the male organs of the flowers - anthers. Pollination occurs when pollen is transferred from the anthers to the female organs by wind or by animals. If the female stigma is receptive to a pollen grain, the pollen produces a pollen tube, which grows through the female tissue to the egg, where fertilization takes place by the sperm nucleus.
  4. 4. Female reproductive organ Pistil *Stigma –top of the pistil, Sticky surface for pollen to stick to *Style – connects the stigma to the ovary *Ovary –contains ovules ( eggs) Male reproductive organ Stamen *Anther – produces sperm nuclei by meiosis. Sperm nuclei are enclosed by pollen grains. *Filament – holds the anther up
  5. 5. Pollination • Transfer of mature pollen grains from the anther to the stigma -wind -insects -birds & other animals
  6. 6. • When a pollen grain lands on the stigma, it germinates and a pollen tube grows down through the style to an ovule (egg)
  7. 7. 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)
  8. 8. *Self pollination –pollen from same flower *Cross pollination – pollen from a different flower - more variation
  9. 9. • 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
  10. 10. The plant embryo uses food stored in the cotyledon of the seed until it develops leaves for photosynthesis
  11. 11. Seedling micropyle –opening in ovule where pollen tube attached, sperm entered hilum –scar where ovule attached to ovary radicle –embryonic root
  12. 12. Epicotyl – grows above the cotyledons and gives rise to the leaves. Hypocotyl –below the point of attachment of the cotyledon, develops into the stem.
  13. 13. Parts of a seed • Dicot Seed coat Hypocotyl Epicotyl Cotyledons Endosperm • Monocot Seed coat Epicotyl Hypocotyl Cotyledon Radicle
  14. 14. Seed Germination Monocot Dicot Epigeous Hypogeous Radicle

×