Population Size — Cumulative exam Answers

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Which of the following statements about the phosphorus cycle is true?

In living organisms, phosphorus can be found in nucleic acids.

Phosphorus in aquatic ecosystems is only found in sediment.

Elevated levels of phosphorus in aquatic ecosystems is always beneficial.

The soil plays no part in the phosphorus cycle.

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Which of the following does not occupy the bottom of an energy pyramid?

phytoplankton

trees

grass

zooplankton

Why is phytoplankton located near the ocean’s surface?

It cannot live in areas of high salinity.

It can more easily evade predators on the oceans’s surface.

It needs access to oxygen only found at the ocean’s surface.

It needs sunlight to survive.

Which of the following statements about biodiversity is not true?

Changes to biodiversity never occur naturally.

Changes to biodiversity can lead to a decrease in ecosystem stability.

Changes to biodiversity can positively and negatively affect on an ecosystem.

Changes to biodiversity can lead to an increase in ecosystem stability.

How is water transferred from the air to the ground?

transpiration

precipitation

evaporation

all of the above

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