Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892



Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

From which biome are trees excluded by periodic fires and grazing herbivores?

a. tropical rainforest

b. thorn forest

c. chaparral

d. temperate grassland

e. arctic tundra

Summary Introduction


Some biomes are subjected to periodic fires, due to which certain plant species get removed. This is due to the temperature difference in these biomes, which depends on their location from the Equator and the amount of rainfall they receive annually.


Justification/Explanation for the correct answer:

Option (d) is given that the temperate grasslands are subjected to periodic fires, excluding the trees. These biomes consist of grasslands that stretch over vast areas. The prairies of North America, steppes of Central Asia, and pampas of South America include these temperate grasslands. Their winters are cold and summers are hot and dry, because of which they catch fire easily. Thus, a lot of their tree and plant species are removed frequently. These grasslands also serve as excellent pasturing grounds for the local cattle and other wild herbivores. Therefore, overgrazing also removes a patch of these biomes. Hence, option (d) is correct.

Explanation for the incorrect answers:

Option (a) is given that thetropical rainforestsare subjected to periodic fires, which exclude the trees. Tropical rainforests are evergreen forests that receive high rainfall year round. The high moisture content does not favor fires in these biomes. As the population of trees is much higher than grasses, it is not a favorable ground for grazing...

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