SPONGE ACTIVITIES
Week 13
Obj 3
Energy used by producers in a
grassland food web is provided by —
F
G
H
J
sunlight
photosynthesis
oxygen
carbon dioxide
A food pyramid represents the relative amount of energy in trophic
levels. Which of the following correctly shows a food pyramid?
F
H
G
J
About 10% of the energy at one trophic level is
passed to the next level. What usually happens
to the energy that is not passed to the next
trophic level or used to carry out life processes?
A
B
C
D
It is given off as heat.
It is stored as vitamins.
It is used in reproduction.
It is used in protein synthesis.
The marine ecosystem represented above is able
to thrive with a small autotroph biomass because
A
B
C
D
autotrophs reproduce rapidly
first-order consumers are small
second-order consumers are rare
third-order consumers eat very little
In this food web,
the bacteria probably
function as —
A
B
C
D
producers
herbivores
decomposers
carnivores