Cicle del Nitrogen i la seva Importància
14 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

Quin és el major origen de nitrogen a l'entorn?

L'atmosfera

Per què el nitrogen és important per als éssers vius?

  • Cap de les anteriors
  • El nitrogen forma part dels aminoàcids, que són els blocs de construcció de les proteïnes.
  • Totes les anteriors (correct)
  • El nitrogen és un nutrient essencial per al creixement de les plantes.
  • El nitrogen és necessari per a la formació d'ADN i ARN.
  • Com entra el nitrogen a la cadena alimentària?

  • Els animals consumeixen plantes, que han absorbit nitrogen del sòl.
  • Cap de les anteriors
  • Totes les anteriors (correct)
  • Les plantes absorbeixen nitrogen en forma de nitrats (NO3) del sòl.
  • El nitrogen atmosfèric (N2) es converteix en forma disponible per als éssers vius mitjançant un procés anomenat fixació de nitrogen.
  • Quin és el procés que converteix els compostos orgànics de nitrogen en amoníac?

    <p>Amonificació</p> Signup and view all the answers

    Quin és el procés que converteix l'amoníac en nitrats?

    <p>Nitrificació</p> Signup and view all the answers

    Quin és el procés que converteix els nitrats en nitrogen gasós?

    <p>Desnitrificació</p> Signup and view all the answers

    La fixació de nitrogen és un procés que converteix el nitrogen gasós en amoníac.

    <p>True</p> Signup and view all the answers

    El procés Anammox implica l'oxidació anaeròbica d'amoníac.

    <p>True</p> Signup and view all the answers

    Quins problemes ambientals poden causar nivells elevats de nitrogen a l'aigua?

    <p>Totes les anteriors</p> Signup and view all the answers

    Quins són els bacteris que duen a terme la nitrificació?

    <p>Nitrificants</p> Signup and view all the answers

    Quin és el paper dels nitrificants en la nitrificació/desnitrificació pel tractament d'aigües residuals?

    <p>Totes les anteriors</p> Signup and view all the answers

    L'amoníac és un nutrient essencial per al creixement de les plantes.

    <p>True</p> Signup and view all the answers

    En quin tipus d'entorns ocorre la desnitrificació?

    <p>Entorns anòxics</p> Signup and view all the answers

    Quin és el producte final de la desnitrificació?

    <p>Nitrogen gasós (N2)</p> Signup and view all the answers

    Study Notes

    Introduction

    • The nitrogen cycle is a biogeochemical process where nitrogen is converted into various forms.

    Nitrogen Cycle Summary

    • The cycle involves processes like nitrogen fixation, ammonification, nitrification, and denitrification.

    Where nitrogen is found in the environment

    • The largest source of nitrogen is the atmosphere, comprising 78.09%.

    Atmospheric Composition

    • Other components of the atmosphere include oxygen (20.95%), argon (0.93%), carbon dioxide (0.038%), and minute traces of other gases.

    Why is Nitrogen important?

    • Nitrogen (N) is crucial for creating proteins.
    • Amino acids are the building blocks of proteins.
    • Nitrogen is a key element in amino acids.
    • Proteins are essential components of tissues, muscle, and organs, as well as enzymes and hormones vital for living organisms.
    • Most living things cannot directly use atmospheric nitrogen (N2), which needs to be converted into other forms, such as nitrates.

    Where does Nitrogen come from?

    • Nitrogen fixation, lightning, industrial processes, and fertilizers are natural and human-made sources of nitrogen.

    Why treat Nitrogen?

    • High nitrogen levels lead to environmental problems like eutrophication (excessive plant and algae growth).
    • Eutrophication depletes oxygen, harming aquatic life.
    • High levels of nitrates can cause a serious health condition called Methemoglobinemia ("blue baby syndrome").

    Introduction to the N cycle

    • The nitrogen cycle involves the conversion of nitrogen into various forms: N₂(g), NO₃⁻(aq), NO₂⁻(aq), NH₄⁺(aq), organic N.

    Nitrification

    • Nitrification is a two-step process that converts ammonia into nitrates.
    • It is an aerobic (oxygen-requiring) process carried out by bacteria.

    Nitrification Key Concepts

    • Nitrification is crucial for many organisms as it's their sole method of acquiring nitrogen.
    • It transforms ammonia into nitrates, which are more soluble and readily absorbed by organisms.
    • In agriculture, ammonia is used as fertilizer and is converted to nitrates, facilitating nitrogen uptake by plants.

    Denitrification

    • Denitrification is an anaerobic (oxygen-free) process that converts nitrates back into nitrogen gas (N₂), which is released into the atmosphere.
    • Essential in anoxic environments.
    • Denitrification plays a crucial role in the nitrogen cycle.
    • It's used in wastewater treatment.
    • It's used to treat elevated nitrate and nitrite levels in drinking water.

    Denitrification Energy Reaction

    • Various organic materials, like metanol, acetate, ethanol, and glucose, can be used as electron donors.

    Anammox Process

    • The anammox process is an anaerobic process that converts ammonium and nitrite to nitrogen gas and water.

    Exercises

    • Exercises provided focus on writing balanced equations for specific nitrification-denitrification reactions.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    Description

    Explora el cicle del nitrogen, un procés bioquímic essencial per a la vida. Aprèn sobre les seves fases i la importància del nitrogen en la formació de proteïnes i aminoàcids. Descobreix per què és necessari convertir el nitrogen atmosfèric en formes utilitzables pels éssers vius.

    More Like This

    Nitrogen Cycle and Processes Quiz
    5 questions
    Nitrogen Cycle Overview
    12 questions

    Nitrogen Cycle Overview

    PalatialBlackHole6548 avatar
    PalatialBlackHole6548
    Use Quizgecko on...
    Browser
    Browser