Trophic Levels, Interactions, Population Dynamics

The efficiency of energy transfer from a lower trophic level to the next highest level is roughly

• 1%
• 10%
• 100%
• 1000%

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Trophic levels are represented by 

• squares
• circles
• pyramids
• lines

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In the energy pyramid here, how much of the energy in each level gets lost as heat or used by the organism for survival?

• 80%
• 90%
• 10%
• 20%

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NGSS.MS-LS2-3

Biomass refers to

• Chemical Energy
• Light Energy
• Rank in the feeding heirarchy
• Amount of living mass at the trophic level

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The process of plants using energy from the sun to create the first trophic level is called?

• Photosynthesis
• Chemosynthesis
• Cellular Respiratation
• Primary Producers

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Which of the following is an example of an abiotic limiting factor on population size?

• water availability

• Availability of food

• disease

• predation

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Carrying Capacity is

• the capacity of what one person can carry per day 
• how many animals you have in your daily bag limit at the end of the year
• wildebeest at a watering hole with zebras
• the maximum number of individuals that the environment can support

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NGSS.MS-LS2-1

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Owls and snakes eat mice and other organisms. What would happen to the mice population if the owl population decreased?

• The population would decrease, as the loss of owls as part of their diet is a limiting factor.

• The population would decrease, as shelters created by owl nests is a limiting factor.

• The population would increase, as competition for food is a limiting factor.

• The population would increase, as predation by owls is a limiting factor.

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NGSS.MS-LS2-1

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The chart shows predator and prey relationships in four different ecosystems.. Which is a correct example of a change that would happen to one population because of a change in the other population because of a predator/prey relationship?

• When the population of sharks decreases because of fishing, the population of small fish will decrease.

• When the population of sharks decreases because of fishing, the population of small fish will decrease.

• During hunting season when many deer are killed by hunters, the mountain lion population will decline.

• When the mice population increases due to having more resources, the population of snakes will decrease.

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NGSS.MS-LS2-1

NGSS.MS-LS2-2

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Which statement best describes the trend for the dolphin population?

• The dolphin population is decreasing.

• The dolphin population is increasing.

• The dolphin population goes up and down.

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NGSS.MS-LS2-1

NGSS.MS-LS2-4