GHS CRT Biogeochemical

Low availability of which element could be a limiting factor in a plant in a plant community?

• nitrogen

• argon

• mercury

• sodim

In the nitrogen cycle, what do bacteria that live on the roots of plant do?

• break down nitrogen compounds into nitrogen gas

• remove nitrogen compounds

• change nitrogen gas into plant proteins

• change nitrogen gas into ammonia

How is carbon dioxide released into the atmosphere?

• Vehicle emissions

• Photosynthesis & respiration

• Denitrification

• Nitrification

How is carbon dioxide removed from the air?

• the burning of fossil fuels

• the burning of trees

• plants during photosynthesis

• animals during respiration

Carbon dioxide is released into the atmosphere by all of the following EXCEPT

• burning of fossils fuels

• depletion of the ozone layer

• burning of trees and forests

• burning of gasoline

What is the process by which bacteria convert nitrogen gas in the air to ammonia?

• nitrogen fixation

• excretion

• decomposition

• denitrification

Which of the following processes is NOT part of the carbon cycle?

• photosynthesis

• transpiration

• burning of fossil fuels

• decomposition of plants and animals

How is carbon stored in the biosphere?

• in the atmosphere as carbon dioxide

• underground as fossil fuels and calcium carbonate rock

• in the oceans as dissolved carbon dioxide

• all of the above