Igcse Nitrogen Cycle and Eutrophication

Which of the following is true about nitrogen?

• It is the most common gas in air

• It is needed to make all proteins

• It is taken up as a gas through the roots of plants

Tags

NGSS.MS-LS2-1

What is true of nitrogen fixation?

• It converts nitrogen gas to nitrates

• It is carried out by bacteria but can also happen by lightning

• It converts nitrogen gas to ammonia

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

NGSS.MS-LS2-4

How can nitrogen become part of animal proteins?

• Animals inhale nitrogen gas

• Animals feed on plants

• Animals eat carbohydrates

• Animals inhale nitrous oxide gas

In the nitrogen cycle, in what form do decomposers release nitrogen from dead plants and animals?

• nitrogen gas

• ammonia

• nitrate ions

• nitrous oxide gas

What can be a source of nitrates for eutrophication in rivers?

• fertilizers

• plastic bottles

• paper

• sewage

Tags

NGSS.MS-ESS3-4

NGSS.MS-LS2-5

What is the very next thing that happens after fertilizers enter a river in eutrophication?

• Fish die due to a lack of oxygen

• Plants below the surface die due to a lack of sunlight

• The number of aerobic bacteria increases

• Fast growth of plants

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

What is the very next thing that happens after fast growth of plants in eutrophication?

• Fish die due to a lack of oxygen

• Plants below the surface die due to a lack of sunlight

• The number of aerobic bacteria increases

• Plants on the surface die due to too much sunlight

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

What is the very next thing that happens after plants die in eutrophication?

• Fish die due to a lack of oxygen

• The number of plants increases again as they have more access to sunlight

• The number of aerobic bacteria increases

• The number of nitrates in the river increases again

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

In eutrophication, what directly causes the death of fish?

• The plants use up oxygen in respiration

• The fish are poisoned by high CO₂ levels

• Bacteria use up oxygen in respiration

• The fish use up oxygen in respiration

Tags

NGSS.MS-LS2-4

In eutrophication, what does 'algal bloom' refer to?

• The rapid increase in the number of bacteria

• The rapid increase in the number of plants

• The rapid decrease in the number of fish

• The rapid increase in the amount of nitrates in the river

Tags

NGSS.MS-ESS3-4

NGSS.MS-LS2-3