Which of the following lists of organisms is ranked in correct order
from lowest to highest
percent in production efficiency?
A)
mammals, fish, insects
B) insects, fish, mammals
C) fish,
insects, mammals
D) insects, mammals, fish
E) mammals,
insects, fish
mammals, fish, insects
A 3-hectare lake in the American Midwest suddenly has succumbed to an
algal bloom. What
is the likely cause of eutrophication in
freshwater ecosystems, such as this one?
A) increased solar
radiation
B) introduction of non-native tertiary consumer
fish
C) nutrient-rich runoff
D) accidental introduction of a
prolific culture of algae
E) iron dust blowing into the lake
nutrient-rich runoff
Approximately how many kg of carnivore biomass can be supported by a
field plot
containing 1,000 kg of plant material?
A)
10,000
B) 1,000
C) 100
D) 10
E) 1
10
The amount of chemical energy in a consumer's food that is converted
to its own new
biomass during a given time period is known as
which of the following?
A) biomass
B) standing crop
C)
biomagnification
D) primary production
E) secondary production
secondary production
What is secondary production?
A) energy converted by secondary
consumers from primary consumers
B) solar energy that is
converted to chemical energy by photosynthesis
C) food that is
converted to new biomass by consumers
D) energy that is not used
by consumers for growth and reproduction
E) growth that takes
place during the second year of life in consumers
food that is converted to new biomass by consumers
How does inefficient transfer of energy among trophic levels result
in the typically high
endangerment status of many top-level
predators?
A) Top-level predators are destined to have small
populations that are sparsely distributed.
B) Predators have
relatively large population sizes.
C) Predators are more
disease-prone than animals at lower trophic levels.
D) Predators
have short life spans and short reproductive periods.
E)
Top-level predators are more likely to be stricken with parasites.
Top-level predators are destined to have small populations that are sparsely distributed.
Trophic efficiency is
A) the ratio of net secondary production
to assimilation of primary production.
B) the percentage of
production transferred from one trophic level to the next.
C) a
measure of how nutrients are cycled from one trophic level to the
next.
D) usually greater than production efficiencies.
E)
about 90% in most ecosystems.
the percentage of production transferred from one trophic level to the next.