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WorksheetsAnalyze Food Webs
Total questions: 16
Worksheet time: 32mins
If mice were removed from this ecosystem, which of the
following would also be expected to occur?
a decrease in the cricket population
a decrease in the corn population
a decrease in the hawk population
a decrease in the moth population
Which of the following would cause a decline in the lizard population?
a decrease in the cricket population
an increase in the corn population
a decrease in the mice population
an increase in the moth population
A decrease in which of the following populations would have the greatest effect on the rest of the organisms in this ecosystem?
hawks
corn
crickets
birds
Which of the following are the producers in this ecosystem?
Humpback whales
Sea turtles
Phytoplankton
Sharks
Which of the following could be a long-term result of reducing the herring population in this ecosystem?
an increase in the puffin population
a decrease in the shark population
an increase in the codfish population
a decrease in the humpback whale population
Which of the following would be a result of increasing the krill population in this ecosystem?
a reduction in the humpback whale population
an increase in the jellyfish population
a decrease in the codfish population
an increase in the phytoplankton population
Overhunting of humpback whales would result in which of the following changes to this ecosystem?
a decrease in the puffin population
an increase in the population of krill
an increase in the phytoplankton population
increased competition between top predators
A decrease in the population of sharks due to poaching would cause which of the following factors to immediately increase for the puffins?
Predation
Competition
Parasitism
Adaptation
A reduction in the population of mice in this food web could cause which of the following changes to occur?
a decrease in the grass population
an increase in the snake population
an increase in the grasshopper population
a decrease in the grain population
Insecticides are used by a farmer to decrease the grasshopper population in this area. This reduction in the grasshopper population would also cause which set of changes?
the grain population to decrease and the frog population to decrease
the grain population to decrease and the frog population to increase
the grain population to increase and the frog population to increase
the grain population to increase and the frog population to decrease
If 500,000 kJ of food energy is available in the producers of this ecosystem, approximately how many kilojoules of energy would be present in the primary consumers?
500,000 kJ
50,000 kJ
10,000 kJ
5,000 kJ
Which organism in this food web would be classified as an
omnivore?
Cricket
Mouse
Snake
Hawk
Which of these changes would cause an increase in the
cricket population?
a reduction in the mouse population
an increase in the snake population
an decrease in the hawk population
a rise in the lizard population
Which population in this food web would contain the lowest amounts of chemical energy and biomass?
Grass
Mouse
Lizard
Hawk
In this food chain, the spiders are -
Producers
Primary consumers
Competitors
Secondary Consumers
In this food pyramid, how much energy is available as the energy is passed from one trophic level to another?
1%
10%
25%
50%
