4.3 cycles of matter Quiz

The process in which bacteria convert nitrogen gas (N₂) from the atmosphere into ammonia that plants can use is called:

The process in which other bacteria convert nitrates back into nitrogen gas and return it to the atmosphere is called:

Water evaporates from the ocean due to:

In the nitrogen cycle, nitrogen fixation is performed mostly by:

Which statement best describes a limiting nutrient?

Which human activity adds carbon dioxide to the atmosphere?

Which part of the water cycle directly forms clouds?

Which nutrient is MOST often a limiting factor in freshwater ecosystems?

Which statement describes how matter moves through ecosystems?

What is the main source of energy that drives the water cycle?