Practice Nitrogen Cycle Multiple Choice Questions with Answers Quiz-1

Q.1.

Where can nitrogen fixing bacteria be found

Free living in the soil
living on the nodules of certain plants
in the atmosphere
Both A & B

Q.2.

Fixation is the process of

conversion of N2 to forms that can be used to synthesize inorganic nitrogen compounds
conversion of Co2 to forms that can be used to synthesize organic carbonic compounds
conversion of N2 to forms that can be used to synthesize organic nitrogen compounds
conversion of H2O to forms that can be used to synthesize organic aqueous compounds

Q.3.

Nitrogen fixation is the

Conversion of N2(nitrogen) to NO3-(nitrate)
Conversion of N2 to N
Conversion of N2 to urea
All of the above

Q.4.

What plants help or are beneficial to the nitrogen cycle?

peas
clover
peanuts
All Of above

Q.5.

What do free living bacteria in the soil do?

Make clouds
Turn atmospheric nitrogen into nitrates
Make carbon dioxide for plants to go through photosynthesis
Help plants take in water

Q.6.

Which plant is an example of a legume?

strawberries
carrots
peanuts
corn

Q.7.

What can excess amounts of nitrogen cause in ecosystems?

Disrupts the equilibrium of ecosystem, causing number of species to decline
Leads to improvement of an ecosystem due to healthy plant growth
Leads to high oxygen content in aquatic ecosystems
Increases the speed of decomposition of plants and animals

Q.8.

How does fertilizer affect the nitrogen cycle

cause nitrous oxide, a greenhouse gas, to enter the atmosphere and trap heat
create large algae blooms in the water
cause the nitrogen fixing bacteria in the soil to be less productive
All Of above

Q.9.

Burning fossil fuels releases this into the air

nitrous oxide
nitrate
nitrogen gas (N2)
methane

Q.10.

Plants and animals need nitrogen to make __________.

Protein
Carbohydrates
Lipids
Minerals

Q.11.

What is the formula for atmospheric nitrogen?

N
N2
NH3
NO3

Q.12.

Nitrogen accounts nearlyof the air. Still Nitrogen is the most limiting nutrient for plant growth because

N2 cannot be directly utilized by plants
High energy is required to break triple bond
Nitrogen is almost an inert gas as N involved reaction requires extreme conditions such as high temperature
All of the above

Q.13.

What is the process of combining nitrogen gas with other elements to make nitrogen into usable compounds?

nitrogen composition
ammonia
nitrogen fixation
denitrification

Q.14.

What is the role of denitrifying bacteria

change nitrate back into nitrogen gas
change nitrogen gas into nitrate
absorb carbon dioxide in the soil
release oxygen gas into the atmosphere

Q.15.

Bacteria fix nitrogen from the atmosphere into a form plants can use.

True
False

Q.16.

Arrange the following process of nitrogen cycle in proper sequence (i)Denitrification(ii)Nitrogen Fixation(iii)Ammonification(iv)Nitrification

i-iii-iv-i
i-ii-iii-iv
iv-iii-ii-i

Q.17.

Nitrogen-rich fertilizers and manure can cause water pollution.

True
False

Q.18.

What happens when organisms die and decay?

Their bodies are lifted up
Their nitrogen returns to the soil
they keep their nitrogen
They stay on earth forever

Q.19.

Can animals and plants directly absorb nitrogen from the atmosphere, is this statement true or false

False
True

Q.20.

Round structures on the roots of certain plants

lichens
commensals
cataracts
nodules

Support mcqgeeks.com by disabling your adblocker.