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Understanding the Nitrogen Cycle

Understanding the Nitrogen Cycle

Assessment

Interactive Video

Biology, Science

6th - 10th Grade

Practice Problem

Medium

Created by

Amelia Wright

Used 11+ times

FREE Resource

Nitrogen is crucial for life, cycling through the biosphere like carbon and oxygen. It makes up 78% of our atmosphere as N2, but unlike carbon, it cannot be directly fixed by plants. Bacteria in the soil convert N2 into ammonia, which plants can use. Nitrogen is vital in organic molecules like amino acids, ATP, and DNA. The nitrogen cycle involves recycling nitrogen through decomposition and conversion back to atmospheric N2. Fertilizers rich in nitrogen enhance plant growth, highlighting its importance in agriculture.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What percentage of the Earth's atmosphere is composed of molecular nitrogen?

21%

78%

50%

33%

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which organisms are primarily responsible for fixing atmospheric nitrogen?

Plants

Fungi

Bacteria

Animals

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the form of nitrogen that plants can directly use?

NO3

NO2

NH3

N2

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is NOT an example of an organic molecule containing nitrogen?

Glucose

Amino acids

ATP

DNA

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the role of bacteria in the nitrogen cycle?

They convert nitrogen into carbon.

They decompose dead organisms.

They produce oxygen.

They fix nitrogen and decompose organic matter.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What happens to nitrogen when an organism dies?

It is converted into carbon.

It is broken down into nitrites and nitrates.

It is released as oxygen.

It disappears.

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How is nitrogen returned to the atmosphere in the nitrogen cycle?

Through photosynthesis

By plants absorbing it

Through animal respiration

By bacteria converting it back to N2

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