Transcript A. What are living things like?

Table of Contents
Chapter: Life's Structure and
Classification
Section 1: Living Things
Section 2: How are living
things classified?
Living Things
1
A. What are living things like?
1. Any living thing is called an organism.
2. Organisms vary in size—from the microscopic
bacteria in mud puddles to gigantic oak trees—
and are found just
about everywhere.
Living Things
1
A. What are living things like?
3. All organisms have some features in common.
These features include cells, the ability to grow
reproduce, and a need for energy.
Living Things
1
B. Living Things Are Organized
1. All living things are made of cells, smallest
unit of an organism that carries on the
functions of life.
2.Some organisms are composed of just one cell
while others are composed of many cells.
3. Each cell has an orderly
structure and contains
the instructions for
cellular organization and
function in its hereditary
material.
Living Things
1
C. Living Things Grow and Develop
1. Growth of a many-celled organism, such as a
human, is mostly due to an increase in the
number of cells.
2.In one-cell organisms, growth is due to an
increase in the size of cell.
Living Things
1
C. Living Things Grow and Develop
3. Organisms change as they grow. All of the
changes that take place during the life of an
organism is called development.
Living Things
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C. Living Things Grow and Develop
4. The length of time an organism
is expected to live is its life
span.
5. Some organisms have a
short life span. Others have a
much longer life span.
6. Some bristlecone pine trees
have been alive for more than
4,600 years but a mayfly
lives only one day.
Living Things
1
D. Living Things Respond
1. Living things must interact with their
surroundings. Anything that causes some
change in an organism is a stimulus.
2. All living things interact with their
surroundings and respond to stimuli. Often,
a response results in movement.
3. An organism must respond to stimuli to
carry on its daily activities and to survive.
Living Things
1
D. Living Things Respond
4. All living things maintain homeostasis, the
regulation of an organism’s internal, lifemaintaining condition despite changes in its
environment.
5. Homeostasis is a trait of all living things.
Living Things
1
E. Living Things Use Energy
1. All living things use energy. The energy used
by most organisms comes either directly or
indirectly from the Sun.
2. Plants and some other organisms use the
Sun’s energy, carbon dioxide, and water to
make food.
Living Things
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E. Living Things Use Energy
3. Organisms that do not get
energy directly from the Sun
must take in oxygen in order
to release the energy in foods.
4.Some bacteria can’t use the
Sun’s energy to produce food;
instead, the bacteria use
energy stored in some
chemical compounds and
carbon dioxide to make food.
Living Things
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F. Living Things Reproduce
1. All living things reproduce to make more of
their own kind.
2. Some bacteria reproduce every 20 minutes,
while it might take a pine tree two years to
produce seeds.
3. Without
reproduction, living
things would not
exist to replace those
individuals that die.
Living Things
1
G. What do living things need?
1. All living things need a place to live, water,
and food source to survive.
Section Check
1
Question 1
A _______ is the smallest unit of an organism
that carries on the functions of life.
Section Check
1
Question 2
Any living thing is called a(n) _______.
Section Check
1
Question 3
Which is the smallest unit of an organism that
can carry on life functions?
A. cell
B. organ
C. organ system
D. tissue
End of Chapter Summary File