Chapter 55-Ecosystems and Restoration Ecology Flashcards
1
Q
The direct product of nitrogen fixation is?
A
NH3
2
Q
Which of the following is true of the nitrogen cycle?
A
Nitrite is converted to nitrate (NO3-) by nitrifying bacteria.
3
Q
Eutrophication in lakes is frequently the direct result of _____.
A
nutrient enrichment such as nitrate and phosphate runoffs from land
4
Q
How do iron levels affect phytoplankton populations in a marine ecosystem?
A
Iron stimulates the growth of cyanobacteria, which convert atmospheric N2 to nitrogenous minerals, stimulating the growth of phytoplankton.
