Effects of Cycles on Ecosystems Answers

Fluctuations in the phosphorus cycle in aquatic ecosystems _______.a.can lead to changes in the growth rates of aquatic populationsb.are never caused by human impact on the environmentc.lead to a decrease in the amount of phosphorus found in sedimentd.never occur naturally

Populations are positively and negatively affected by a variety of biotic and abiotic factors, including the cycles of matter. Every autumn between September and November, Canadian geese will migrate from their breeding grounds in Canada to warmer Southern locations. However, in the spring between February and March, the geese will return to Canada. Photo by Peter McDermott Which abiotic factor would likely have the greatest effect on Canadian geese migration? a. fluctuations in the carbon cycle b. fluctuations in the nitrogen cycle c. fluctuations in the phosphorus cycle d. fluctuations in seasons Please select the best answer from the choices provided

The desert relies on precipitation from weather patterns, while the rainforest can create its own precipitation.

Where do animals obtain carbon?a.the atmosphereb.plant and animal consumptionc.the soild.photosynthesis

Fertilizer runoff has a negative impact on aquatic ecosystems because _______.a.it causes plants and algae to grow quickly, suffocating organisms in the waterb.phosphorus is not found in naturec.phosphorus is poisonous to living organismsd.living organisms do not require phosphorus in order to survive

Plants in the rainforest _______.a.effectively conserve and retain water b.have low levels of transpirationc.release 50-80% of their water back into the ecosystemd.are adapted to conditions of drought

Phosphorus plays an important role within the structures of the body. Which of the following structures is phosphorus found in? a. bones b. cell membranes c. DNA d. all of the above Please select the best answer from the choices provided

Phosphorus is contained in _______. a. living organisms b. soil c. bodies of water d. all of the above Please select the best answer from the choices provided

A large portion of precipitation in the rainforest occurs as a result of _______.a.perspirationb.respirationc.oxidationd.transpiration

Carbon is found only in living organisms.