Introduction to Life Science by 5i32VE

VIEWS: 9 PAGES: 17

									Introduction
   to Life
  Science


  What is Life?
  What Characteristics do
  all Living Things Share?

1.All living things have a
  cellular organization.
A cell is the basic unit of life.
Unicellular- one celled
Multicellular- more than one cell
2.   Cells are composed of
     chemicals.
     Water- the most abundant
     Carbohydrates- for energy
     Proteins and lipids- building
     materials
     Nucleic Acids- contain
     genetic material
3. Living things react to
 stimuli.
  A stimulus is something in
 the environment that causes a
 reaction, or a response.
  A response is an action or
 change in behavior.
4. Living things grow
 and develop.

Growth- an increase in the size
 of an organism.
Development- a progressive
 change in an organism over
 time.
5.All living things have the
 ability to reproduce.
All living things arise from other
 living things.
The theory of Spontaneous
 Generation, which proposed that
 life can appear spontaneously from
 non-living things, was disproved by
 experiments performed by Redi
 and Pasteur.
 Life Comes from Life
• Living things come from living
  things.
• 400 years ago people though
  that living things came from
  non-living things (Spontaneous
  Generation).
• Francisco Redi, Louis Pasteur
  did experiments to disprove
  this theory.
Redi’s Experiment
      Do Now!

Answer questions #1-3 on
 pages 18-19 in your
 workbooks.
6. All living things use
 energy.

Energy is used to nourish,
 repair and create new cells.
We obtain energy from
 converting the foods that we
 eat into energy that can be
 used by the cells.
7. All living things can
 move.

This process is called
  Locomotion.
Plants move their branches and
  leaves toward the Sun!
8.All living things will
  die.

One of the realities of life is that
  all life eventually comes to an
  end. This process is called
  Expiration.
     Do Now!

Answer question #4 on
 page 20 in your
 workbook.
   What do All Living
Things Need to Survive?
1. Water****
2. Food
3. Living space
4. Stable internal
   conditions
   (Homeostasis)
  How do Organisms
Obtain Food for Energy?
• Autotrophs- make their own
  food (Plants).
• Heterotrophs- obtain food
  from other sources.
    Herbivore- eat plants.
    Carnivore- eat animals
     (meat).
    Omnivore- eat plants and
     animals.
      Do Now!

Answer questions #5,6 on
 page 21 in your
 workbook.
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