Chapter 6 Plants

1
Chapter 6 Plants

• 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

2
Vascular Plants

• Features

3
Vascular plants Tube-like cells

• True stems
• True roots
• True leaves

4
Types of tube-like cells

• Xylem cells
• Thick walled cells that carry water and dissolved
  minerals to the leaves
• Phloem cells
• Carry food from the leaves to all parts of the
  plant

5
Nonvascular Plants

• Moss, liverworts
• No true roots
• No true stems
• No true leaves
• Life cycle of a moss
• Sexual reproduction, union of 2 reproductive
  cells
• Takes place at the tips of the stems

6
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

7
(No Transcript)
8
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

9
(No Transcript)
10
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

11
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

12
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

13
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

14
Conifers Continued

• 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

15

• 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

16
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

17
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

18
Flowering Plants

• Without plants no other animals would exist
• All animals depend on plants for food, and oxygen