Download Energy Pyramid ppt - Mr. Le`s Living Environment Webpage

Aim: How to analyze an energy
pyramid?
Look at the pond ecosystem
 We know all living things
need energy in order to
survive. But…….
 Where does the energy
to support life originally
come from?
 Which type of living
things can trap this
energy?
Regents Biology



How does energy flow in an ecosystem?
Does all the energy get transferred or some of it is loss?
These are some interesting
questions we can ask ourselves.
Regents Biology
Energy Pyramid
 show how energy flows
through an ecosystem.
 illustrates that the amount
of available energy
decreases at each
succeeding trophic level.
 The total energy transfer
from one trophic level to the
next is only about ten
percent
Regents Biology
Why 90% of the energy is loss as
you move up the energy pyramid?
 Answer: The cost of living!
17%
growth
only this energy
moves on to the
next level in
the food chain
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energy lost to
daily living
33%
cellular
respiration
50%
waste (feces)
Check for Understanding
 Which trophic
level contains the
most amount of
available energy?
 Which trophic
level contains the
least amount of
available energy?
Regents Biology
Energy Pyramid
 level D = producers
 level C = primary consumers
 level B= secondary consumers
 level A = tertiary consumers
tertiary consumers
secondary consumers
primary consumers
producers
Regents Biology
Check for Understanding
 What happens to the total amount of
available energy as you move up the
trophic level?
tertiary consumers
secondary consumers
primary consumers
producers
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Summary Question
 How does energy flow in an
ecosystem?
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Critical Thinking Question
 What happens to an ecosystem if there
is a drought (prolong period without
rain) ? Explain. Must be as least 1
paragraph.
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Critical Thinking-Application Question
 As the number of people in poor
countries begin to become wealthy,
they start to demand and consume
more meat based diet rather than plants
based diet. How will this effect the
environment and you?
Regents Biology
Let’s Check for Understanding
Regents Based Questions
Base your answer to the question on the diagram of a food web and on
your knowledge of biology.
1. What is the original source of energy for this food web?
A.
B.
C.
D.
chemical bonds in sugar molecules
enzymatic reactions
the Sun
chemical reactions of bacteria
Regents Biology