Abiotic and Biotic Competition Activity

Which factor is most responsible for limiting the number of giraffes in a savanna ecosystem?

• the amount of rainfall

• the temperature of the environment

• the presence of other herbivores like zebras

• the number of trees with leaves at a height only giraffes can reach

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What happens when an ecosystem exceeds its carrying capacity?

• The population will continue to grow.

• Some individuals will die or migrate to another location.

• The ecosystem will expand to accommodate more individuals.

• Resources will become more abundant to support the growing population.

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NGSS.MS-LS2-1

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How does the availability of water affect the competition among organisms in a desert ecosystem?

• It reduces competition because water is always available.

• It increases competition, as water is a limited resource.

• It has no effect on competition because all organisms are adapted to low water levels.

• It increases the number of organisms that can survive without water.

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NGSS.MS-LS2-1

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What is the effect of nutrient-poor soil on plant populations?

• It leads to a decrease in plant populations due to increased competition.

• It supports larger populations with less competition.

• It has no effect on plant populations since all plants need the same nutrients.

• It causes plants to grow faster to reach the nutrients they need.

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Which scenario would cause a significant change in an ecosystem’s stability?

• a sudden increase in the population of a top predator

• a long period of consistent and mild weather

• a steady supply of water and sunlight

• a severe and long drought that depletes all water sources

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Select ALL that describe biotic factors in an ecosystem.

• the temperature of the water in a pond

• the amount of sunlight received by plants

• fungi decomposing a fallen tree

• bacteria breaking down dead organic matter in the soil

• a herd of deer grazing in a meadow

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NGSS.MS-LS1-4

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Select ALL that are abiotic factors in an ecosystem.

• the moisture level of the air in a rainforest

• a population of fish in a river

• a forest of pine trees

• the oxygen content in a lake

• the acidity level (pH) of the soil

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NGSS.MS-LS2-3

In a forest ecosystem, where is competition for sunlight most intense?

• At the forest floor

• In the middle canopy

• At the top of the canopy

• Near the forest edges

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How does competition for sunlight affect the growth of plants in a forest?

• It helps all plants grow equally

• It limits the growth of some plants

• It has no effect on plant growth

• It only affects animals

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NGSS.MS-LS1-5

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