Chapter 20 Quiz 3

The diagram shows some processes in the nitrogen cycle.

In process I, (a)________________ bacteria found in the root nodules of leguminous plants convert nitrogen gas to ammonium compounds which are required for the synthesis of proteins. This process is called (b)________________.

• (a) nitrifying；(b) nitrification

• (a) nitrifying；(b) nitrogen fixation

• (a) nitrogen fixing；(b) nitrification

• (a) nitrogen fixing；(b) nitrogen fixation

The diagram shows some processes in the nitrogen cycle.

In process II, (c)________________ bacteria convert ammonium compounds to nitrates. This process is called (d)________________.

• (c) nitrifying；(d) nitrification

• (c) nitrifying；(d) nitrogen fixation

• (c) nitrogen fixing；(d) nitrification

• (c) nitrogen fixing；(d) nitrogen fixation

The diagram shows some processes in the nitrogen cycle.

In process III, (e)________________ bacteria convert nitrates to nitrogen gas. This process is called (f)________________.

• (e) Nitrifying；(f) nitrification

• (e) Nitrifying；(f) denitrification

• (e) Denitrifying；(f) nitrification

• (e) Denitrifying；(f) denitrification

Fill in the blanks with suitable words. What are (a) and (b)?

• (a) thermal；(b) organic

• (a) thermal；(b) inorganic

• (a) chemical；(b) organic

• (a) chemical；(b) inorganic

Fill in the blanks with suitable words. What are (c) and (d)?

• (c) feeding；(d) respiration

• (c) respiration；(d) feeding

• (c) feeding；(d) feeding

• (c) respiration；(d) respiration

Fill in the blanks with suitable words. What are (e) and (f)?

• (e) heat；(f) organic

• (e) chemical energy；(f) organic

• (e) heat；(f) inorganic

• (e) chemical energy；(f) inorganic