1. ENERGY IN ECOSYSTEMS
Grade 9
Biology Unit

2. The of all energy in ecosystem is the
source
It gives us
light
warms
It the surface of the earth
It gives energy needed to
from Lakes and oceans to
evaporate water
form precipitation
It provides energy used by
to make the compounds they use as
and indirectly to provide other organisms
green plants
food
food.

3. Photosynthesis ONE WAY
The process by which green plants use sunlight to produce a sugar.
glucose
****resulting in ENERGY****
In a food chain/web, energy flow is
ONE WAY
Producer  1
Consumer  2
Consumer
As energy is within an ecosystem
From organism to organism , it changes
transferred
form.

4. stay alive! Plants convert sunlight into
Plants use chemical energy to etc.
Animals use chemical energy to , keep etc.
chemical energy
grow
move
warm
Not all energy a plant creates reaches the animal
That eats it, because the plant uses much of it to
stay alive!

5. Of the energy supplied by Earth’s producers:
~ is lost through
~ is lost to
~ goes to
65%
metabolism
20%
decomposers
15%
primary consumers
In every ecosystem, there is
available to the consumer
than the consumer.
less energy
secondary
primary

6. Why? Producers use suns energy to Primary consumers use whatever is
to maintain their There is only a little left to
Secondary consumers only receive a
of the energy originally by the producer
live
“left over”
lives
“pass on”
small fraction
stored
For an ecosystem to work, there must be
in order to provide consumers with enough
more producers than consumers
energy to survive.

7. Food Web