1. LESSON 9 SEXUAL REPRODUCTION IN FLOWERING PLANTS KEY CONCEPTS Open your yellow book to page 107

2. THE FLOWER IS THE SEXUAL REPRODUCTIVE ORGAN OF A FLOWERING PLANT.
Concept #1
THE FLOWER IS THE SEXUAL REPRODUCTIVE ORGAN OF A FLOWERING PLANT.

3. Concept #2
PERFECT flowers contain both MALE and FEMALE reproductive structures. IMPERFECT flowers contain EITHER the male or the female reproductive structure.

4. Concept #3
POLLINATIONis the transfer of POLLENfrom ANTHERto STIGMA. POLLEN GRAINS from different kinds of plants are very different in SIZE and SHAPE.

5. Some plants SELF-POLLINATE; others require CROSS- POLLINATION.
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 SEED begins to form when fertilization occurs. The OVARY becomes the FRUIT.

8. LESSON 9 SEXUAL REPRODUCTION IN FLOWERING PLANTS Types of Pollination

9. 1. Self - Pollination
Process by which 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, two different plants, same species (much more specific)