1. PLANT REPRODUCTION

2. ENDURING UNDERSTANDING
Flowers depend on seed production and dispersal for their reproduction.

3. LEARNING GOAL
I will dissect and mount the structures of simple flowers.
I will examine a variety of seeds to discover their dispersal mechanisms.
I will explain the function of flowers and pollination.
I will explain how seed-dispersal mechanisms contribute to a plant’s survival.
I will understand the origin of seeds by investigating the reproductive systems in flowers.

4. DISCLAIMER
This unit is about Plant Reproduction! There will be terms and words used that are…interesting. DO WHATEVER YOU NEED TO DO TO BE A MATURE SCIENTIST.

5. LIFE ON EARTH There are 5 primary groups of life called kingdoms.
Monera (bacteria)
Protists (single-celled)
Fungi (yeast, mushrooms)
Animals
Plants
We know that a characteristic of life is to reproduce.

6. PLANT REPRODUCTION Plants have sexual reproduction.
In order to discover how plants reproduce, we will investigate and study their structures.

7. PLANT REPRODUCTION

8. VIDEO CLIP

9. The ovary of the flower is where the seeds develop
The ovary of the flower is where the seeds develop. As we know, seeds contain an embryo, which is the living baby plant that has the potential to grow into a new plant.

10. Seeds start as ovules, tiny preseeds in the ovary
Seeds start as ovules, tiny preseeds in the ovary. The ovary is located at the base of the pistil in the center of the flower. Inside each ovule is a single, female sex cell, the egg. Some plants have one ovule in the flower, like a peach or cherry flower. Other plants have hundreds of ovules in the flower, like a watermelon or a tomato flower.

11. Before an ovule can develop into a seed, the egg must be fertilized
Before an ovule can develop into a seed, the egg must be fertilized. An egg is fertilized when it joins with a male sex cell, the sperm. The sperm cell is inside the pollen grain. Pollen grains are produced by the plant in the anthers at the tips of the stamens. The process by which pollen gets from the male anther to the female pistil is called pollination.

12. Pollination is complete when a pollen grain, carried by air, water, or an animal, lands on the sticky tip of the pistil, the stigma. The pollen grain then germinates and grows a structure like a root that goes down the length of the pistil. It is called the pollen tube. The sperm cell from the pollen grain travels down the pollen tube into the ovule, and penetrates the membrane of the egg cell. The contents of the two sex cells mix together, forming a single, fertilized cell. The fertilized cell is alive and has the potential to develop into a new plant.

13. Sexual reproduction happens when a female sex cell (egg) and a male sex cell (sperm) merge to form a single cell with information from both the male and the female.

14. READING We will read the article called, “FLOWER TO SEEDS” page 40
Then answer 6 questions about the reading

15. Ovary- where seeds develop Ovules- tiny preseeds in the ovary
WORD BANK
Ovary- where seeds develop
Ovules- tiny preseeds in the ovary
Pistil- center of the flower, ovary is located at the base (female part)
Egg- female sex cell in the ovule
Fertilized- ovule joins with sperm to create an egg (embryo)

16. WORD BANK
Sperm- male sex cell located in pollen grain
Pollen grain- contains the sperm cell
Anthers- produces the pollen grains, located at the end of the stamen
Pollination- the process by which pollen gets from the male anther to the female pistil and down to the egg
Stigma- sticky tip of the pistil

17. WORD BANK
Pollen tube- grows from the pollen grain the length of the pistil and carries the sperm cell
Sexual Reproduction- happens when a female sex cell (egg) and a male sex cell (sperm) merge to form a single cell with information from both the male and female

18. HOMEWORK
Go home and look for, obtain, ask for, any flowers to bring in to dissect.
If you bring some in, come to me at 8am tomorrow and we will put them in some water.
You may not dissect the flower you bring.

19. FLOWERS What are the purpose of flowers? (think of the video)
Many plants produce flowers. I have some examples of typical flowers. You will be working with your group to observe a flower in detail.
First you will observe the complete flower, then you will dissect it to study its structures and designs.

20. Watch and learn how to make a flower mount
CD-ROM
Watch and learn how to make a flower mount

21. FLOWER-MOUNT STEPS Stick one end of tape to tabletop.
Place an index card on top of the edge of the tape.
Extend the tape across the card (sticky side up) and tuck the other end of the tape under the card.
Lower the card with the tape across it flat onto the table.

25. FLOWER-MOUNT FINISHING STEPS
Slide the index card out from under the tape.
Put the card over the tape strip.
Firmly press the card onto the tape.
Carefully lift the card from the table and fold the tape ends to the back of the card.