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How do seed plants grow & reproduce


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How do seed plants grow & reproduce

  2. 2. WHAT CAN YOU SEE IN THIS PICTURE? These are seeds
  3. 3. Plants are just like us, they have babies & make new plants -So, A seed is a baby plant
  4. 4. SEEDS They are plants that are not fully formed 
  5. 5. PARTS OF A SEED - A seed has 3 parts:  1) Seed coat : A cover that protects the seed.  2) Embryo: The baby plant.  3) Stored food.  Seed coat Stored food Embryo
  6. 6. WE CAN CLASSIFY THE SEEDS ACCORDING TO Seed structure - Water melons have flat small seeds. - Mangos and peaches have one seed. - Coconuts are giant seeds. Where are seeds stored - Flowers that bear “make” seeds like: Apple trees - Seeds found on the surface of the cones like: Pine trees..
  7. 7. A PINE TREE A pine tree contains two types of cones: 1) A Male cone. 2) A Female cone.
  8. 8. REPRODUCTION IN PINE TREES Male cone Female cone -Small cones. -Bigger cones. -Present below the female cones on a conifer tree. -Present above the male cone in a conifer tree. -Produce pollens “Yellow powder” -Produce “make” the seeds when the pollens are carried by the wind and land on the female cone
  9. 9. THE FLOWER - The flower is the part of the plant which is responsible for reproduction . -Most of the flowers have 2 parts: 1) Male part Anther (Stamen) Filament 2) Female part (Pistil) Stigma Style Ovary Ovule
  10. 10. THE FLOWER STRUCTURE Pollen tube Style Filament Stigma Anther Petal Ovary Ovule Sepal
  11. 11. POLLINATION  - Now let’s see what happens inside a flower Pollination: it is the transfer of the pollens from the male part to the female part of the flower.
  12. 12. STEPS OF THE POLLINATION 1) The petals have bright colors  to attract insects to drink the nectar (sugary liquid) in the flowers.
  13. 13. 2) Pollen grains from the anther  stick to the insects wings and gets carried to the stigma (Pollination)
  14. 14. 3) Tube “Pollen tube” grows  down the style and enters the ovary
  15. 15. 4)The pollen enters the egg in  the ovary (seeds are made) (Fertilization)
  16. 16. 5) Then the ovary becomes a  fruit and the petals fall.
  17. 17. A SEED’S LIFE  Do you think a seed is alive or dead? Well, A seed is alive but it waits for the conditions to be right to start to grow “germinate”.
  18. 18. THE CONDITIONS NEEDED FOR THE SEED TO GERMINATE: - For the seed to germinate it needs: Soil Sunlight Water
  19. 19. GERMINATION PROCESS A seed with a tiny embryo inside remains in the ground until conditions are right for the seed to germinate. After the seed coat splits the embryo root begins to grow into the soil. Now the embryo can get water Food in the seed feeds the embryo as the shoot (stem) grows upward the light. The stem grows, leaves develop, and roots spread in the soil. Now the seedling can make its own food
  20. 20. SEEDS CAN BE PLANTED ALSO BY NATURE: Nature can help in seed planting by