Answers 26-27 - C - RUSD Biology in the Living Earth Changes in the Earth's Surface — TestQuestion 24

24

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Changes in the Earth's Surface — Test

Question 24 • 26-27 - C - RUSD Biology in the Living Earth

Construction has removed the top 25 cm of soil from a site. What impact will this have on plant growth?

Answer

A

Plants will thrive, as they now have direct access to clay-rich soil.

B

There will be minimal impact, since the B horizon provides all the needed nutrients.

C

Root growth will increase because the B horizon has been exposed.

D

Plant growth may be reduced due to the loss of the nutrient-rich A horizon.

Explanation

The topsoil is usually the A horizon, which contains much of the soil’s organic matter and nutrients that support plant growth. Removing the top 25 cm can therefore leave plants with less fertile soil and make growth harder. The B horizon below it is not a substitute for the nutrient-rich topsoil, so D is correct.

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