Human-induced modifications of the nitrogen cycle can result in
A)eutrophication of adjacent wetlands.
B)decreased availability of fixed nitrogen to primary producers.
C)accumulation of toxic levels of N2 in groundwater.
D)extermination of nitrogen-fixing bacteria on agricultural lands.
E)deprivation of nitrogen to ecosystems adjacent to nitrogen application.

Question

Quizplus · Accepted Answer

Human-induced modifications of the nitrogen cycle often increase the amount of nitrogen available in ecosystems, leading to eutrophication in adjacent wetlands. This can cause an overgrowth of algae, leading to decreased oxygen levels, which can harm fish and other aquatic life.

Answer: B
 While human activities can increase the amount of nitrogen available in ecosystems, it can also lead to decreased availability of fixed nitrogen to primary producers. For example, when nitrogen pollution occurs in streams and rivers, it can limit the amount of nitrogen that is available to aquatic plants and animals.

Answer: E
 In some cases, human activities such as fertilizer application and nitrogen deposition can result in adjacent ecosystems being deprived of nitrogen. This can occur when the nitrogen applied or deposited in one area is taken up by plants or washed away before it can reach other parts of the ecosystem.

Human-Induced Modifications of the Nitrogen Cycle Can Result in