Transcript Flower Structure and Function

Flower Structure and Function
Flowering plants are called
angiosperms.
They are the greatest number of plants
on Earth.
What helps them survive? Diversity !
What is diversity? Look around you.
Diversity is variation within a
community.
Main Plant Parts
Angiosperms are made up of 4 parts:
1. Roots - Stabilizes the plant below ground,
absorbs water and nutrients from the soil.
2. Stems - Stabilizes the plant above ground and
allows plant to grow higher and wider.
3. Leaves - Act as food factories of the plant.
Take in CO2, make glucose, release O2.
Waxy coat to prevent water loss.
4. Flowers - Contain angiosperms reproductive
parts.
Reproduction in Angiosperms
Flowers are the reproductive
structures of angiosperms.
Have either male or female reproductive
parts.
Some flowers contain both male and female
reproductive parts.
4 reproductive parts to flowers:
1. Stamen: Holds male reproductive parts and
produces pollen.
2. Pollen: Powder containing male sperm.
3. Pistil: Female parts located here.
4. Ovary: Hollow structure at bottom of pistil,
contains female egg cell.
Flower Parts
M = Male
F = Female
N
n
F
M
Male
M
F
M
F
F
EGG
F
F
Pollination
When pollen from 1 of its flowers or
from another flower of the same
species reaches an egg cell.
2 characteristics that attract pollinators:
1. Color
2. Aroma (Smell)
What are pollinators?
Organisms that carry pollen from stamens to
pistils.
Examples are: insects, like honeybees,
butterflies, moths, birds, and mammals, like
bats.
Steps in Fertilization
1st- Pollen travels down into ovary to
fertilize female egg.
2nd-Fertilized egg becomes a seed.
3rd. - The ripened ovary develops into a fruit.
The fruit contains the seeds that can develop
into new plants.
Fruit: A ripened ovary.
Fruit protects newly fertilized egg.
Some plants produce fruit with many/only
one seed. Ex. Peach-1/Apple-Many
Each seed contains a tiny new plant called an
embryo.
New seed has 2 things:
1. Seed coat – protection
2. Cotyledons – Stored food for embryo.
Parts of a seed
Embryo
Stem and Root
Cotyledon (Stores Food)
Seed Coat
Germination
Sprouting of a new plant from a seed.
Let’s look at Germination.
Seed Dispersal
How are seeds sent out or dispersed
into the environment?
Animals, water, wind, hooks on certain
seeds (cuckleburr)
How do angiosperms and animals help one
another?
Lesson 9 Review Questions
1. Which of these is a male part of the flowering plant?
A.
stomata
B
stamen
C.
ovary
D.
pistil
2. A new plant inside a seed is called
A. an embryo.
B. a pistil.
C. a cotyledon.
D. an ovary.
4. Which plant structure is NOT involved in
sexual reproduction?
A. ovary
B. pistil
C. stamen
D. stem
3. Which of these plants develop into a fruit?
A.
pistil
B.
ovary
C.
flower
D.
seed
Reproduction in Flowering Plants Study Guide
1. What are flowering plants called?
2. What helps them survive?
3. What is diversity?
4. What are the 4 parts to angiosperms?
5. Describe each one.
6. What are the reproductive structures of angiosperms?
7. T or F- Some flowers have male and female parts
8. What are the 4 reproductive parts to flowers? Describe each one.
9. What is fertilization and describe how it occurs?
10. What is pollination?
11. What 2 things attract pollinators?
12. What are pollinators?
13. Give 3 examples of pollinators.
14. What do plants offer pollinators?
15. Explain in order how pollination occurs.
16. Give 2 examples of pollinators and how the type of flower they visit suits them.
17. Describe germination and how it occurs.
18. What is a fruit?
19. What does a fruit protect?
20. What is seed dispersal and what are some things that help with this?