Transcript Document

1. Which level of the food web would
have the largest population? Why?
1. Which level of the food web would
have the largest population? Why?
Answer:
Trophic level 1  The primary producers!
1. Which level of the food web would have the
largest population? Why?
Answer: Trophic level 1  The
primary producers!
-It’s all about energy! With
each trophic level,
there is less energy available to
support life
This is an energy pyramid
-Up to 90% of energy is
lost at each level
1. Which level of the food web would have the
largest population? Why?
Answer: Trophic level 1  The
primary producers!
-It’s all about energy! With
each trophic level,
there is less energy available to
support life
This is an energy pyramid
-Up to 90% of energy is
lost at each level
• The unit of measurement
used to describe the
amount of energy at each
trophic level is in an
energy pyramid is called
kilocalorie (kcal)
• Energy is lost at each level
as organisms carry out life
functions; some is lost as
heat
• 10% rule  divide by 10 to
find the amount of energy
left at each level
This is an energy pyramid
– Shows how much energy is consumed at
each trophic level
-Up to 90% of energy is lost at each
level
2.) Which level of the food web would have
the smallest population? Why?
2.) Which level of the food web would have
the smallest population? Why?
The loss of energy at each trophic level also explains why
there are usually fewer organisms in each higher trophic
level
ANSWER : Top predators Tertiary or quaternary consumers
3. Which level of the food web would
have the largest sized adult organism?
Why?
3. Which level of the food web would have the
largest sized adult organism? Why?
Answer: The predators –
Tertiary consumers
For example: Killer whale
75 g/m2
Pyramid of Biomass
Biomass, in ecology, is the mass of living biological
organisms in a given area or ecosystem at a given
time.
Biomass can refers to the mass of all species in the
community. It can include microorganisms, plants
or animals.
The mass can be expressed as the average mass
per unit area (g/m2), or as the total mass in the
community.
150 g/m2
675 g/m2
2000 g/m2
Which type of pyramid is this?
A. Energy Pyramid
B. Pyramid of numbers
C. Pyramid of biomass
Which type of pyramid is this?
A. Energy Pyramid
B. Pyramid of numbers
C. Pyramid of biomass
Which type of pyramid is this?
A. Energy Pyramid
B. Pyramid of numbers
C. Pyramid of biomass
Which type of pyramid is this?
A. Energy Pyramid
B. Pyramid of numbers
C. Pyramid of biomass
Which type of pyramid is this?
A. Energy Pyramid
B. Pyramid of numbers
C. Pyramid of biomass
Which type of pyramid is this?
A. Energy Pyramid
B. Pyramid of numbers
C. Pyramid of biomass