PB19 - Organisms and their Environment

What are the two main ways of nitrogen fixation?

Lightning and nitrogen-fixing bacteria

What is denitrification?

The process of nitrates turning back into nitrogen gas (N₂)

Which organism in the nitrogen cycle does the process of denitrification?

Denitrifying bacteria

Which organisms break down proteins into ammonia in the nitrogen cycle?

Decomposers

Which organisms turn ammonium ions into nitrite ions in the nitrogen?

Nitrifying bacteria

Which organisms turn atmospheric N₂ into nitrogen compounds that plants can use?

Nitrogen-fixing bacteria

What does a pyramid of energy in a food chain show?

The energy stored at each trophic level

What are the two advantages of using a pyramid of energy compared to a pyramid of biomass?

Shows a more accurate representation of energy transfer and allows for better comparison between ecosystems