Transcript Chapter 6 Plants

Chapter 6 Plants
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There are 350,000 species of plants
Features
chloroplasts
chlorophyll---chemicals that give
plants green color and trap light energy.
Plants are producers, lowest life on the
food chain
Plants have a stiff cell wall
Vascular Plants
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Features
Vascular plants Tube-like
cells
True stems
 True roots
 True leaves
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Types of tube-like cells
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Xylem cells
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Thick walled cells that carry water and
dissolved minerals to the leaves
Phloem cells
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Carry food from the leaves to all parts
of the plant
Nonvascular Plants
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Moss, liverworts
No true roots
 No true stems
 No true leaves
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• Life cycle of a moss
• Sexual reproduction, union of 2 reproductive
cells
• Takes place at the tips of the stems
Ferns
Form coal
 Is a vascular plant
 Reproduces with spores
 Because they are a vascular plant
they can grow taller than
nonvascular plants. Why?
 There are over 12,000 known
species of ferns
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More on Ferns
Ferns are over 300 million years old
 Have xylem and phloem cells
 Leaves are divided into tiny leaflets
 Similar to nonvascular plants in that
they reproduce with spores
 Refer to the figure 6-7 in chapter 6
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Seed plants
Most common land plants
 Reproduce by forming seeds
 A seed is the part of the plant
 that contains a new, young plant
and stored food
 The young plant in the seed is the
embryo
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Seed plants continued
Seed has a hard outer covering
called the seed coat which protects
the embryo
 The food supply and the coat help
the embryo survive for long periods
of time, until conditions are right for
growth
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Conifers
Most common land plants
 Produces seeds in cones
 Keep their leaves throughout the
year
 Sometimes called evergreens
 Mostly found in the northern areas
of the world
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Conifers continued
Leaves are small and needle-shaped
 Pine, spruce, fir are examples of
conifers
 Copy figure 6-10 into your notebook
 Conifers reproduce with cones, small
cones are male and produce pollen
in which sperm develop
 Male cones open early in spring
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Conifers Continued
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Wind carries the pollen to the larger
female cones
Female cones contain egg cells
When the seeds are ripe, the cones dry
up and open and the fertilized seeds fall
to the ground
The roots and stems of conifers are hard
and woody
Conifers supply ¾ of the lumber that is
used in the world
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Conifers are not only important to us
but they are also a important food
source and shelter for animals such
as insects, birds, squirrels, rabbits
Flowering Plants
Produces seeds inside a flower
 Flower is the reproductive part of
Produces flowers and forms fruits
 a plant
 Male part produces sperm
 Female part produces the egg
 Female parts form the fruit that
protects the seeds
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Flowering Plants cont.
Many broadleaved trees, vegetables,
grasses,weeds and thorn bushes
have flowers, not just sweet
smelling showy flowers
 Many produce flowers at a certain
time of year, used for decoration
 Some parts you can eat, oranges,
potatoes
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Flowering Plants
Without plants no other animals
would exist
 All animals depend on plants for
food, and oxygen
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