Worksheets7th EOY Review: Unit 9
Total questions: 20
Worksheet time: 5hrs 0mins
In a forest ecosystem, which organism is responsible for converting sunlight into usable energy for other organisms in the food web?
Producer
Consumer
Decomposer
Predator
What is the term for a relationship where both organisms benefit from their interaction?
Parasitism
Mutualism
Predation
Competition
Which of the following is considered a limiting factor in an ecosystem?
Amount of sunlight
Number of predators
Availability of water
All of the above
A rabbit eats grass, and a fox eats the rabbit. What role does the rabbit play in this food web?
Producer
Primary consumer
Secondary consumer
Decomposer
Which relationship best describes a tick feeding on a dog?
Mutualism
Commensalism
Parasitism
Competition
If a pond dries up during a drought, which limiting factor is most directly affecting the fish population?
Food
Water
Disease
Space
A student observes mushrooms growing on a fallen log. What role do the mushrooms play in the ecosystem?
Producer
Consumer
Decomposer
Predator
Which of the following is an example of commensalism?
A bee pollinating a flower
A barnacle attaching to a whale
A lion hunting a zebra
A tapeworm living in a dog
A group of birds competes for the same nesting site in a tree. What type of relationship is this?
Mutualism
Competition
Parasitism
Predation
Which of the following would most likely decrease the population of deer in a forest?
Increase in available water
Decrease in predators
Decrease in food supply
Increase in nesting sites
Given a simple food web with grass, grasshoppers, frogs, and snakes, identify the correct sequence of energy transfer.
Grass → Grasshopper → Frog → Snake
Snake → Frog → Grasshopper → Grass
Grasshopper → Grass → Frog → Snake
Grass → Snake → Frog → Grasshopper
A student observes that when the number of wolves in a forest increases, the number of deer decreases. What type of relationship is this?
Mutualism
Predation
Parasitism
Commensalism
In a local pond, algae grow rapidly when fertilizer runs off from nearby farms. Which limiting factor has changed, and how does it affect the ecosystem?
Food increased, causing algae to overpopulate
Water decreased, causing algae to die
Disease increased, reducing algae
Space increased, causing algae to spread
A student is given a diagram of a food web and asked to identify which organism is both a consumer and a prey. What should the student look for?
An organism that eats others and is eaten by another
An organism that only produces energy
An organism that decomposes dead matter
An organism that is not connected to others
Two different species of birds eat the same type of insect in a forest. What is the most likely relationship between the two bird species?
Mutualism
Competition
Parasitism
Commensalism
A disease spreads through a population of rabbits, causing their numbers to drop. What is the best explanation for this change?
Disease is a limiting factor that reduced the rabbit population
Food supply increased, so rabbits left
Water supply increased, so rabbits died
Space increased, so rabbits moved away
A farmer notices that after removing all the grasshoppers from his field, the population of frogs decreases. Using your knowledge of food webs, explain why this happened.
Frogs lost a food source, so their population decreased
Frogs had more food, so their population increased
Grasshoppers ate frogs, so removing them helped frogs
Frogs are decomposers, so they were unaffected
A student observes that in a local park, squirrels and birds both use tree holes for nesting. Over time, the number of available tree holes decreases. Predict what will happen to the populations of squirrels and birds, and explain your reasoning.
Both populations will decrease due to increased competition for nesting sites
Both populations will increase because they share resources
Only squirrels will decrease, birds will increase
Only birds will decrease, squirrels will increase
A scientist introduces a new species of fish into a lake. The new fish eats the same food as a native fish species. Predict and explain what might happen to the native fish population.
The native fish population may decrease due to competition for food
The native fish population will increase because of more food
The native fish population will not be affected
The native fish population will become decomposers
A severe drought reduces the amount of water in a wetland. Using your understanding of limiting factors, explain how this might affect the populations of plants and animals in the wetland.
Populations of both plants and animals will likely decrease due to less available water
Populations will increase because there is less water to share
Only animal populations will decrease, plants will increase
Only plant populations will decrease, animals will increase
