BARE NECESSITIES OF
LIFE
Water
• (1) Chemical
reactions that keep
organisms alive need
to occur in water
• (2) 70% of cells is
made of water
• (3) Humans can
survive 3 days
without water
Air
• (1) Plants need
carbon dioxide to
make food in
photosynthesis
• (2) Plants & animals
need oxygen to
release energy from
food in cellular
respiration
Cellular Respiration
• (1) Process for plants & animals to
obtain energy using oxygen (O2) and
food (C6H12O6)
• (2) produces energy (ATP) from food
and gives off carbon dioxide (CO2)
and water (H2O)
Photosynthesis
• (1) Process for plants to make food
by using energy from sun, water
(H2O) , and carbon dioxide (CO2)
• (2) produces food (C6H12O6) and
oxygen (O2)
Space (& Shelter)
• (1) Must provide all
the things an
organism needs to
stay alive such as
food, water, air
sunlight, mates and
SHELTER,
protection from the
elements
Food
• (1) source of energy
• (2) source of raw
materials to make or
repair cells and to carry
out life processes
Different ways of obtaining food
• (1) Producers – make
own food using sun,
water and carbon
dioxide
• (2) Consumers –
obtain food by eating
other organisms
• (3) Decomposers –
obtain food by
breaking down dead
organisms
Animal Needs Plant Needs
•
•
•
•
•
Water
Air (oxygen)
Space
Shelter
Food
• Water
• Air (carbon
dioxide & oxygen)
• Space
• Shelter
• Food