Transcript Angiosperms Chapter 8 Section 4 Characteristics of Angiosperms

CHAPTER 8 SECTION 4
ANGIOSPERMS
CHARACTERISTICS OF ANGIOSPERMS
• Flowering plants
• Produce flowers
• Produce fruits
(seeds are
enclosed by fruits)
• Live almost
everywhere on Earth
THE STRUCTURE OF FLOWERS
• All have the same function,
reproduction
• Flower: reproductive structure
of an angiosperm
• Some flowers lack “parts”
SEPALS
• Sepals
• A leaf-like
structure that
encloses the
bud of a flower
• Often green in
color, protect
developing
flower
PETALS
• Colorful, leaf-like structure of
some flowers
• Size, shape, color, and
number of petals vary from
flower to flower
STAMENS
• Male reproductive parts
• Filament
• Thin stalk of the stamen
• Anther
• Produces pollen, top of filament
PISTILS
• Female reproductive parts
• Center of most flowers
PARTS OF THE PISTIL
• Stigma
• Sticky tip of pistil
• Style
• Slender tube, connects stigma
to hollow structure (ovary) at
base of flower
• Ovary
• Protects seeds as they develop,
contain one or more ovules
POLLINATORS
• Color, shape, and scents of flowers
attract insects and other animals
• These organisms ensure that
pollination occurs
REPRODUCTION OF ANGIOSPERMS
1. Pollen (sperm cell) falls on
flower’s stigma
2. Sperm cell and egg cell join
together in ovule
3. Zygote develops into the embryo
part of the seed
POLLINATION
• Occurs when grain of pollen lands on
stigma
• Wind
• Animals
FERTILIZATION
• Pollen falls on stigma, fertilization can
occur
• Sperm cell and egg cell join together
in the ovule within the ovary
• Zygote begins develops into seed’s
embryo
FRUIT DEVELOPMENT AND
SEED DISPERSAL
• After fertilization, seed develops into a fruit
• Fruit: a ripened ovary and other structures
that enclose one or more seeds
• Apples, cherries, tomatoes, squash
TWO TYPES OF ANGIOSPERMS
• Monocots
• Angiosperms that have only one seed
leaf, or cotyledon
• Dicot
• Angiosperms that have two seed
leaves, or cotyledons
MONOCOT
EX. CORN, WHEAT, RICE, LILIES, TULIPS
PLANT PART
MONOCOT
SEED
One cotyledon
LEAF
Parallel veins
STEM
Bundles of vascular
tissue scattered
throughout the stem
Three petals, or a
multiple of three
petals
FLOWER
PICTURE
DICOT
EX. ROSES, VIOLETS, OAK AND MAPLE TREES, DANDELIONS,
BEANS, APPLES
PLANT PART
DICOT
SEED
Two cotyledons
LEAF
Branching Veins
STEM
Bundles of vascular
tissue arranged in a
ring
Four or five petals,
or multiples of these
numbers
FLOWER
PICTURE
SEED PLANTS IN EVERYDAY LIFE
• Gymnosperms--• Paper and lumber to build
homes
• Turpentine (rayon fibers in
clothing)
• Rosin (baseball players,
gymnasts, musicians)
• Angiosperms--• Food, clothing, medicine
for other organisms