NGSS.MS-LS2-1

Below is an example of a simple food chain.

Acorn → Squirrel → Fox → Mountain Lion 

What will most likely happen if squirrels are removed from the food chain?

• The fox will eat acorns
• The fox population will decrease
• The trees will produce fewer acorns.
• The mountain lion population will increase

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NGSS.MS-LS2-1

A foreign insect is introduced into the Texas. It eats a lot of leaves, and trees start to become leafless. Many different animals feed on the new insect, but even they cannot control its numbers. Eventually, trees begin to die. Why would a rapid increase of the new insect population cause certain species of herbivores to vanish or be fewer in number?

• They would not have enough to eat. 
• They would not have enough space to live.
• They would not have tree bark to eat.

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NGSS.MS-LS2-1

Environmental factors that keep a population from increasing. 

• Carrying Capacity
• Limiting Factors

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NGSS.MS-LS2-1

Which of the following describes a consequence of overfishing our ocean ecosystem?

• Removal of invasive species

• Ocean food webs can become imbalanced

• Increased dissolved oxygen concentration

• Fishing vessels cause water to warm up

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NGSS.MS-LS2-1

What year is the lion population the highest

• 1920

• 1990

• 2000

• 2020

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NGSS.MS-LS2-1

Which would be a limiting factor on the rats

• The availability of food.

• The number of predators

• The availability of abiotic resources

• All are limiting factors.

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NGSS.MS-LS2-1

Suppose that a new predator of the rabbit migrated to this ecosystem. What is the most likely initial effect on the other organisms?

• More competition among the mice for food

• More competition among the hawks for food

• Less competition among snakes for food

• Less grass available for food

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NGSS.MS-LS2-1

Who could be affected if the number of birds decreased?

• only the birds

• only the grasshoppers and grains

• only the foxes

• all of the organisms shown

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NGSS.MS-LS2-1

Scientists measured the height of giraffes in two populations—one in the wild and one in a nature preserve. Which statement best describes the difference between the two populations?

• There is more variation in height of the giraffes found in the wild.

• There is more variation in height of the giraffes found in the nature preserve.

• The giraffes in the wild are mostly shorter than the giraffes found in the nature preserve.

• The giraffes in the wild are mostly taller than the giraffes found in the nature preserve.

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NGSS.MS-LS2-1

Which of these answers could best describe an investigation on animal population?

• a single cat that lives in her house

• all of the pets owned by her classmates

• all of the cats in her neighborhood

• the cats and dogs at a local animal shelter

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NGSS.MS-LS2-1