Nitrogen Cycle Flashcards

Flashcards reviewing the nitrogen cycle, biofixation, nitrification, denitrification, and related concepts.

What is abundant in the atmosphere but difficult for most organisms to absorb?

Nitrogen (N2)

What organic molecules contain nitrogen atoms?

Amino acids, DNA, RNA, and ATP.

Name the key processes in the nitrogen cycle.

Biofixation, Nitrification (nitrosation and nitration), Denitrification, Ammonification

Which bacteria is involved in Biofixation?

Rhizobium

Which bacteria is involved in Nitrification (nitrosation)?

Nitrosomonas

Which bacteria is involved in Nitrification (nitration)?

Nitrobacter

Which bacteria is involved in Denitrification?

Pseudomonas denitrificans

What is 'adubacao verde'?

Green fertilization

Describe adubacao verde using leguminosas.

Planting of leguminous plants between rows of a commercial crop or in rotation with commercial crops to enrich the soil.

What benefit does adubacao verde provide?

It reduces the need for nitrogen fertilizers in agricultural production.

What is released into the atmosphere by denitrifying bacteria, contributing to greenhouse gas emissions?

N2O (Nitrous Oxide)

According to the UERJ question (Caderno 2 pg. 347), what is the role of denitrifying bacteria in the nitrogen cycle?

Releasing nitrogen gas into the environment.

According to the ENEM question (Caderno 2 - pg. 348), how do animals obtain nitrogen for their metabolic needs?

Through the transfer of organic matter via food chains.

According to the ENEM question (Caderno 2 - pg. 348), what benefit does the use of leguminosas as adubacao verde provide?

Reduces the need for fertilizer.

According to the FGV-SP question (Caderno 2 - pg. 348), what is the role of bacteria in the agricultural soil, when fertilizer or animal sterco is applied?

bacteria metabolize the components generating nitrito and nitrato, which are then assimilated by the plants to synthesize amino acids and nucleotides