1 / 14

LESSON 9

LESSON 9 . SEXUAL REPRODUCTION IN FLOWERING PLANTS. Concept #1. The FLOWER is the SEXUAL REPRODUCTIVE organ of a flowering plant . Concept #2. PERFECT flowers-contain both male AND female reproductive structures .

avel
Download Presentation

LESSON 9

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. LESSON 9 SEXUAL REPRODUCTION IN FLOWERING PLANTS

  2. Concept #1 • TheFLOWERis the SEXUAL REPRODUCTIVE organ of a flowering plant.

  3. Concept #2 • PERFECTflowers-contain both male AND female reproductive structures. • IMPERFECTflowers- contain either the male OR the female reproductive structure

  4. Concept #3 • POLLINATION-is the transfer of pollen fromANTHERtoSTIGMA. • POLLEN GRAINSfrom different kinds of plants are very different inSIZEandSHAPE.

  5. Concept #4 • Some plants SELF-POLLINATE; others require CROSS-POLLINATION.

  6. Concept #5 • Pollen can be transported by WIND, WATER, GRAVITY, INSECTS, and HUMANS, among other things.

  7. Concept #6 • FERTILIZATION occurs when a SPERM NUCLEUS from a POLLEN GRAIN unites with the EGG NUCLEUS of an OVULE in an OVARY. • A SEEDbegins to form when fertilization occurs. The OVARY becomes the FRUIT.

  8. Types of Pollination • Self-Pollination • Cross-Pollination

  9. 1. Self - Pollination • When a plant pollinates itself (1 plant involved) • Genetically identical offspring • Occurs in different flowers on the same plant • ASEXUAL REPRODUCTION

  10. Self-pollination advantages • Makes sure plant does not go into extinction • If parent can survive in habitat, so can offspring

  11. Self-pollination disadvantages • No variation, so no evolution • Disease may spread easier among identical offspring

  12. 2. Cross Pollination • One plant pollinates another plant (2 plants involved) • Genetically different offspring • Different plant, different flowers (must be from same species) • SEXUAL REPRODUCTION

  13. Cross-pollination advantages • Evolution because offspring not identical to parent or other offspring • Disease will not affect all offspring at once because not genetically identical

  14. Cross-pollination disadvantages • Pollen might not reach stigma (must be compatible to work) • Two parent flowers, 2 different plants, same species (much more specific)

More Related