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Energy through an Ecosystem - Food Webs (Grade 10)

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Energy through an Ecosystem - Food Webs

1. 
Which of the following best represents the flow of energy in a biome?
  1. Food chain
  2. Food web
  3. Energy pyramid
  4. Food circle
2. 
The diagram shows a typical food web in a forest ecosystem.
Food Web
A. 
In this food web, which organism would be considered a tertiary consumer?
  1. the mushrooms
  2. the mouse
  3. the snake
  4. the hawk
B. 
Considering the diagram of the food web, what would be the most likely impact on the ecosystem if a pesticide applied to the grass caused it to die?
  1. The mice population would increase from eating more mushrooms.
  2. The snakes would change their feeding mechanisms from consumers to producers.
  3. The hawk population would ultimate crash because there was nothing for them to eat.
  4. The number of mushrooms would increase dramatically due to increased decomposition.
C. 
Which position in this food web is occupied by the mushrooms?
  1. primary consumers
  2. decomposers
  3. producers
  4. tertiary consumers
D. 
A mountain lion with an affinity for eating snakes has moved into this ecosystem What is a possible outcome of this disturbance?



3. 
Choose whether 'biomagnification' or 'bioaccumulation' best completes the sentence. Write the correct term in the blank.

                                     describes the process by which toxins are taken up and held in an organism from either exposure to or by eating food containing the toxin.                                        occurs when concentrations of toxins in an organism increase due to transfer through the food chain, and specifically from energy loss across trophic levels.
4. 
Why are decomposers such an essential part to any food web and ecosystem?
  1. Decomposers recycle nutrients that keep the flow of energy going.
  2. Decomposers provide the basis of all energy production in the food web.
  3. Decomposers are responsible for keeping the numbers of herbivores in check.
  4. Decomposers prevent new species from coming into the system.
5. 
In a food web, the arrows that connect the organisms always point towards the organism that does the eating.
  1. True
  2. False
6. 
The loss of energy from one trophic level to the next is called the                                     .
7. 
Why is it very uncommon for a food chain in a food web to have more than five steps?



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