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Reproduction in flowering plants presentation
- 7. Parts of the Flower
- 8. Q1. Describe how the flower is attached to the stem. The flower is attached to the stem by a short stalk-like structure.
- 9. Peduncle Sepals The sepals provide protection to the unopened flower. Q2. What is the function of the sepals in the unopened flower?
- 10. Peduncle Sepals Stigma Peduncle Sepals The stigma of the fresh flower feels sticky. Stigma Q3. On which flower does the stigma feel sticky?
- 11. Peduncle Sepals Stigma The stigma is sticky so the pollen grains that fall on it can better adhere on it. Q4. Why do you think the stigma is sticky? The Stigma The stigma receives the pollen from the anther. It is an organ found in the female part of the flower. It is held by the style.
- 12. Peduncle Sepals Stigma Style ovary It is the necklike structure through which the pollen tube grows. The Style Pollen tube grows down the style and into the ovary . It is the juglike structure just below the style. The Ovary It contains the ovules.
- 13. Peduncle Sepals Stigma ovary Style Q5. How many compartments do you find?
- 14. Peduncle Sepals Stigma ovary Style Ovules There are white tiny circular structures. It is called ovules. Q6. Describe what you find inside the compartments, what do you think is it? These are the structure in the ovary that develops into a seed after fertilization. The Ovules
- 15. Peduncle Sepals Stigma ovary Ovule s Style Pistil It is the Female part of the flower. The Pistil
- 16. Peduncle Sepals Stigma Style ovar y Ovules Pistil It is a saclike structure in which pollen grains form. The Anther Anther It is attached to the filament.
- 17. Peduncle Sepals Stigma Style ovar y Ovules PistilAnther It is a thin stalk where anther is attach. The Filament Filament Stamen The Stamen The male part of the flower.
- 18. Pollen grains may reach the pistil through agents of pollination like insects, wind, water, and humans. Q7. How do you think pollen grains reach the pistil?
- 19. P o l l i n a t i o n
- 20. Pollination is the transfer of pollen grains from the anther to the stigma.
- 21. Self Pollination Cross Pollination Plants are self-pollinated if pollination occurs within the same flower or within a different flower on the same individual plant. Occurs when pollen grains are transferred to a flower on another individual plant of the same species
- 23. Self Pollination
- 24. Self Pollination
- 25. Fertilization Is the fusion of the nuclear contents of the egg and sperm cell.
- 27. Then, once on the stigma, pollen may “germinate,” which means that a “pollen tube” forms on the sticky surface of the stigma and grows down into the ovule of the plant. Pollen from the anthers of Flower 1 is deposited on the stigma of Flower 2. One of the nuclei in the pollen tube unites with the egg nucleus in the ovule to form a zygote. The other sperm nucleus combines with another bigger nucleus in the ovule which develops into the endosperm.
- 28. Sexual Reproduction Is a type of reproduction that involves gametes/sex cells (egg and sperm cells). The offspring in sexual reproduction have unique combinations of genes. They differ genetically from their siblings and both parents.
Editor's Notes
- another structure of the flower is the sepal. can you point out where the sepal is?
- pollen from the anthers of the flower is deposited on the stigma. once on the stigma, pollen may germinate, which means that a pollen tube forms on the sticky surface of the stigma and grows down into the ovule of the plant. one of the nuclei in the pollen tube unites with the egg nucleus in the ovule to form a zygote, the other sperm nucleus combines with another bigger nucleus in the ovule which develops into endosperm.