Transcript The Simple Bare Necessities of Life

The Simple Bare
Necessities of Life
Chapter 2, Section 2
pages 40-41
Food
 provides
organisms with
the energy and raw
materials needed to:
– carry on life processes
– build and repair cells
– build and repair body parts
How organisms get their
food

producers - make their own food
– plants
 use
energy from the sun, water, and
carbon dioxide
– microorganisms in the Movile Cave
 use
chemicals in their environment
How organisms get their
food (cont.)

consumers – must eat (consume)
other organisms to get their
food
– examples – mammals, reptiles

decomposers – must break down
nutrients in dead organisms or
animal waste to get their food
– examples – fungi, bacteria
Water
 most
of the chemical
reactions involved in
metabolism require water
– most living cells are 70%
water
– humans can survive about
three days without water
Air

mixture of several gases
– mostly nitrogen, oxygen, and carbon
dioxide


most living things use oxygen to
release energy from food
some organisms also need carbon
dioxide for photosynthesis (process
of converting energy in sunlight to
energy in food)
A Place to Live


somewhere to live that contains all
the things they need to survive
some organisms require a large
amount of space
– elephant

some organisms do not require very
much space at all
– bacteria
A Place to Live (cont.)
 space
on earth is limited
– creates competition for
territory
Closure Questions
1.
2.
3.
4.
Why are decomposers categorized
as consumers? How do they differ
from producers?
Why are most cells 70% water?
Could life as we know it exist on
Earth if air contained only oxygen?
How might a cave, an ant, and a
lake meet the needs of an
organism?