Carbon and Nitrogen Cycles

Nitrogen & Carbon Dioxide cycles

by Yosvany Plunkett

Question to discuss:

​Is it possible the existency of living thing without those cycles? Explain your answer through examples.

​

Watch the following video

​https://youtu.be/hD9ngrPuejo

Multiple Choice

Which of the following processes contributes to the carbon cycle?

• combustion

• respiration

• photosynthesis

• all of the above

Multiple Choice

The source of carbon to plants in the carbon cycle is

• fossil fuels

• carbonate rocks

• carbon dioxide

• all of the above

Multiple Choice

The conversion of nitrates to nitrogen is called

• Ammonification

• Nitrification

• Nitrogen fixation

• Denitrification

Multiple Choice

The role of bacteria in the carbon cycle occurs in which process below?

• Decomposition of organic compounds

• Combustion

• Photosynthesis

• None of the above

Multiple Choice

In the carbon cycle, the human body returns carbon to the atmosphere through

• formation of glucose

• waste products

• photosynthesis

• respiration

Multiple Choice

Respiration is the process by which ____________ is consumed and _______________ is produced.

• carbon dioxide, oxygen

• carbon dioxide, energy

• energy, carbon dioxide

• oxygen, carbon dioxide

Multiple Choice

Conversion of ammonia to nitrite and then to nitrates is called

• Ammonification

• Denitrification

• Assimilation

• Nitrification

Multiple Choice

Most of the global warming is due to the perturbation of which of these cycles?

• Nitrogen cycle

• Carbon cycle

• Water cycle

• All of these cycles equally contribute

Multiple Choice

By this method, the majority of carbon moves from the lithosphere to the atmosphere

• erosion

• deposition

• weathering

• fossil fuel burning

Multiple Choice

In which form do animals gain nitrogen?

• Ammonium

• Nitrate

• Protein

• Nitrite

Multiple Choice

Which of these organisms capture most carbon from the atmosphere

• Plants

• Fungi

• Bacteria

• Insects

Multiple Choice

What is the most common way that nitrogen fixation occurs?

• lightning

• nitrogen fixing bacteria

• fossil fuel combustion

• forest fires

Multiple Choice

Which of the following statements is correct?

• Carbon is the main component of organic compounds

• Excess nitrogen is responsible for global warming.

• The Nitrogen cycle is more important than the Carbon cycle

• All of the above

Multiple Choice

Nitrogen is MAINLY absorbed by the plants in the form of

• Ammonium

• Nitrites

• Nitrates

• All of the above

Multiple Choice

Nitrogen fixation is the conversion of

• Nitrogen gas to ammonium

• Nitrogen gas to Nitrates

• Nitrogen gas to urea

• Nitrogen to nitrites

Multiple Choice

Nitrification is the transformation of

• Ammonium to nitrates

• Ammonium to nitrogen

• Ammonium to amino acids

• Ammonium to nitrites

Multiple Choice

Photosynthesis is the process by which plants

• release CO₂ to the atmosphere.

• turn CO₂ into sugars.

• turn sugars into energy.

• none of the above

Multiple Choice

Conversion of nitrites to nitrates is done by

• Denitrifying bacteria

• Nitrifying bacteria

• Nitrogen fixing bacteria

• Ammonium bacteria

Multiple Choice

One of the main ways Carbon Dioxide is removed from the atmosphere is

• photosynthesis

• combustion

• respiration

• decomposition

Multiple Choice

Which of the following is an example of human impact on the carbon cycle?

• cutting down trees

• burning fossil fuels

• both a) and b)

• neither a) nor b)

Next topic: Food chain & food web.

​Questions to discuss:

​1. What is food chain?

​2.What is food web?

​3. What are their components?

​4. What are the consequences if one of their components is missing?