Characteristics of Life
What are organisms?
things that have all the characteristics of life
What is reproduction?
the process of which one organism makes one or more new organisms
What are stimuli?
Changes in the environment
What is homeostasis?
an organism's ability to maintain steady internal conditions when outside conditions change
Everything you do requires what?
All______ are organized, grow and develop, reproduce, respond, maintain certain internal conditions and use energy.
Living Things
What do some organisms need in order to reproduce, but others can reproduce without one?
a mate
Give one example of internal stimuli
hunger
thirst
What happens when an organism cannot maintain homeostasis?
The organism may get sick or die.
What do people do that requires energy, according to the textbook on page 14?
digest food, sleep, think, read and more
A(n) ______ is the smallest unit of life.
cell
How do many unicellular organisms, such as bacteria, reproduce?
They reproduce by simply dividing into two new organisms, each of which is identical to the original organism.
Give one example of external stimuli
light
temperature
sight
sound
smells
What do cells do when certain conditions are met?
Function Properly
How do cells continuously use energy?
to transport substances, make new cells, and perform chemical reactions
What is the difference between unicellular and multicellular?
Unicellular organisms are made of only one cell, while multicellular organisms are made of more than one cell.
Compare the process of reproduction and growth.
Reproduction is the production of new cells and results in a new organism, while growth is the production of more cells, but does not produce a new organism.
How can external stimulus create an internal stimulus?
Happens all the time.
For example: the smell of a sizzling hamburger can influence the feeling of hunger
Why can the human body not maintain homeostasis for very long in water that is less than 10 degrees C?
The body cannot generate enough heat to compensate for the heat being lost to the water, so body temperature declines.
What do all organisms require to survive?
energy
Which is not a characteristic of all living things?
a. growing
b. breathing
c. reproducing
d. using energy
b. breathing
What would happen if living things could not reproduce?
If living things could not reproduce, there would not be any living things.
What are two unpleasant internal stimuli that people experience?
pain
fear
excessive heat
excessive cold
Why is maintaining homeostasis important to organisms?
Homeostasis ensures that an organism can function.
Where do organisms get most of their energy from?
the Sun