NGSS.MS-LS2-4

What would happen if the population of hawks suddenly increased? How would it affect the other organisms in the ecosystem?

• The snakes would decrease due to more hawks eating them
• All of the population of organisms would increase
• The biotic factors in the ecosystem would increase
• The hawks predators would decrease

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NGSS.MS-LS2-4

After a volcanic eruption, lava covers the land. What is the order that plants grow to repopulate the area?

• Lichens → Shrubs → Grasses → Trees
• Lichens → tree → shrubs→Grasses
• Grasses → Lichens → Shrubs → Trees
• Lichens → Grasses → Shrubs → Trees

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NGSS.MS-LS2-4

Which is a biotic factor?

• sunlight
• air 
• bacteria
• all of the above

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NGSS.MS-LS2-4

Fishermen have harvested certain fish to the point where the population of that fish is decreasing. This level of direct harvesting could cause

• ecosystems to be improved for future generations
• ecosystems to be severely damaged
• the restoration of environmental stability
• all other fish species to increase in number

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NGSS.MS-LS2-4

Why are too many nutrients (like nitrates and phosphates) bad for our waters?

• Nutrients decrease the pH of the water, causing it to become increasingly acidic

• Nutrients change the salinity of the water

• Wetlands filter out runoff that may contain nutrients

• Nutrients in the water cause too much algae growth, which decrease the level of oxygen in the water

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NGSS.MS-LS2-4

What is an event that results in an outcome or a change?

• effect

• cause

• feature

• distribution

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NGSS.MS-LS2-4

This is something in an environment like food, water or space that causes a population to decrease.

• predation

• birth rate

• limiting factor

• death rate

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NGSS.MS-LS2-4

Hummingbirds can have different beak lengths.

They use their beaks to reach to the nectar (their food) at the bottom of flowers. Hummingbirds with longer beaks can get food from long flowers. Hummingbirds with shorter beaks cannot reach the nectar in long flowers. If a hummingbird can’t easily reach its food, it will die.

The diagrams below show three possible hummingbird populations.

If their environment changes to have only long flowers, which of the following hummingbird populations will most likely survive?

• Only population 2 will survive because it is the only population with variation.

• All the populations will survive because the hummingbirds will change the length of their beaks if they need to.

• Populations 1 and 2 will survive.

• Populations 1 and 2 will survive.

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NGSS.MS-LS2-4

What was the effect of overgrazing in the Desert/Montane?

• Increased erosion of the soil

• Change from a grassland to desert

• Plant life is scarce

• All the above

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NGSS.MS-LS2-4

_____are scientists who study human impacts on ecosystems.

• Chemists
• Botanists
• Virologists
• Conservation biologists

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NGSS.MS-LS2-4