Transcript Investigation 7.1 PPT

ENDURING
UNDERSTANDING
• Flowers depend on seed
production and dispersal
for their reproduction.
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.
PLANT REPRODUCTION
LIFE ON EARTH
• There are 5 primary groups
of life called kingdoms.
1. Monera (bacteria)
2. Protists (single-celled)
3. Fungi (yeast, mushrooms)
4. Animals
5. Plants
• We know that a
characteristic of life is to
reproduce.
PLANT
REPRODUCTION
• Plants have sexual
reproduction.
• In order to discover how
they do it, we will
investigate and study their
sexual structures.
PLANT
REPRODUCTION
VIDEOS
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.
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.
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.
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.
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.
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)
•
•
•
•
•
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
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
READING
• We will read the article called,
“FLOWER TO SEEDS” page
40
• Then answer 6 questions
about the reading Homework!
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.
CD-ROM
• Watch and learn
how to make a
flower mount
FLOWER-MOUNT STEPS
1. Stick one end of tape to tabletop.
2. Place an index card on top of the
edge of the tape.
3. Extend the tape across the card
(sticky side up) and tuck the
other end of the tape under the
card.
4. Lower the card with the tape
across it flat onto the table.
FLOWER-MOUNT
FINISHING STEPS
1. Slide the index card out from
under the tape.
2. Put the card over the tape strip.
3. Firmly press the card onto the
tape.
4. Carefully lift the card from the
table and fold the tape ends to
the back of the card.