IB ESS Unit 2

What is this picture describing?

• It is describing how two organisms cannot occupy the same niche in the same place at the same time through the competitive exclusion principle.

• It is illustrating the intercompetitive inclusion principle.

• It is describing the amount of time it takes for bacteria to reach exponential growth.

• It is illustrating the mutualistic relationship between two organisms when they live in the same niche.

The total mass of living tissue at each trophic level can be shown in a(n)

• energy pyramid

• pyramid of numbers

• biomass pyramid

• biogeochemical cycle

Why are food chains, such as the one shown, limited to 4-5 organisms?

• There are not more organisms in the ecosystem

• Organisms must share resources

• Energy transfers are inefficient

• They are only limited when organisms are living on land.

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According to the food web shown, what would occur if there were a drastic decrease in the squirrel population?

• There would be fewer vultures

• There would be more nuts and seeds.

• There would be fewer vultures & there would be more nuts and seeds.

• There would be more grass.

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NGSS.MS-LS2-3

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Which letter represents amplitude? (a)  

• A

• B

• C

• D

• E

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At which trophic level can you find an herbivore?

• 1st Level

• 2nd Level

• 3rd Level

• 4th Level

Which organism do the owl and the weasel compete for in the food web?

• Hawk

• Spider

• Grasshopper

• Shrew

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The arrows in a food chain or web represents what?

• They point to the organism that is being eaten.

• It shows how sunlight flows within an ecosystem.

• They show what direction the energy is flowing between organisms. 

• They represent how water is transferred within a habitat.

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Carrying capacity of a habitat is determined by

• population growth rate

• limiting factors

• j versus s type population growth

• r and k survival strategies

The sum total of a population's use of the biotic and abiotic resources of its habitat constitutes its

• evolution.

• range.

• niche.

• environment.