Flower Parts
Receptacle
Sepals
Petals (corolla)
Stamen
Filament
Anther
Pollen
Carpel
Stigma
Style
Ovary
Ovule 4
Carpels, Ovaries & Ovules
Positions and arrangements can
vary
May have male and female flowers
Same or different plants
5
Quick Quiz: The female gametophyte
in a flower is which structure?
A) Anther
B) Carpel
C) Ovule
D) All of the above
6
Gamete Development & Fertilization
Egg development
Meiosis results in 4 megaspores
1 develops further,
3 degenerate
9
Gamete Development & Fertilization
Egg development
Mitosis (nuclei only) results in 1 cell with 8 nuclei
10
Gamete Development & Fertilization
Egg development
Divides into 7 cell embryo sac (female gametophyte)
2 nuclei form
endosperm
6 nuclei each form
individual cells
(1 egg)
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Gamete Development & Fertilization
Sperm development
Spore producing cells form in
pollen sac (anther)
Meiosis results in 4
microspores
Mitosis results in 2-celled pollen
grains (male gametophyte)
One cell will form 2 sperm
nuclei
One cell will form pollen tube
12
Gamete Development & Fertilization
Fertilization
Pollen lands on stigma
Pollen tube forms down style
13
Gamete Development & Fertilization
Fertilization
Sperm nuclei migrate
toward egg for double
fertilization
1 sperm fertilizes egg
embryo
1 sperm fertilizes
endosperm food
source
Fertilized embryo & seed coat
form to becomes a seed
14
Quick Quiz: In double fertilization, one
sperm fertilizes the egg, and the other
sperm fertilizes the…
A) Zygote
B) Endosperm
C) Ovule
D) All of the above
15
Classifying Seeds & Fruits
Catagorized by…
Origin
Simple fruits
Aggregate fruits
Multiple fruits
Which tissues make up the fruit
True fruits
Accessory fruits
Composition of the fruit
Dry fruits
Fleshy (juicy) fruits 16
Simple Fruits
Develop from one or fused carpels of one flower
E.g., cherries, peaches, plums, apples
17
Fruit Tissues
Accessory fruits
Flesh derived from other floral parts (receptacle)
E.g., apple, strawberry
21
Fruit Composition
Dry fruits
Beans, peas, acorns, sunflowers
Fleshy fruits
Tomato, grape, orange, peach, cherry
22
Dry or fleshy?
Quick Quiz: A pineapple is an example
of a _________ fruit because it forms
from many flowers’ carpels fusing
together.
A) Aggregate
B) True
C) Dry
D) Multiple
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Asexual Reproduction
Runners
New shoots from above ground stems
Strawberries
Rhizomes & cormes
New shoots from below ground stems
Grasses, aspen
25
Asexual Reproduction
Tubers
New shoots from underground tubers
Potato
Bulbs
New bulbs from existing underground bulbs
Daffodils, tulips
27
Asexual Reproduction
Parthenogenesis
Embryo develops from unfertilized egg
Roses, oranges
Vegetative propagation
New plant develops from tissue (ex., leaf) that drops
from the parent plant
African violet
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