23.3 Recycling OCR A Biology

What is converted into nitrite and then nitrate in the nitrification process?

• Ammonia

• Nitrogen gas

• Ammonium ions

• Nitrate ions

Which bacteria is responsible for converting ammonium to nitrite?

• Nitrobacter

• Pseudomonas

• Rhizobium

• Nitrosomonas

What type of reaction is denitrification?

• Reduction

• Oxidation

• Catalytic

• Anaerobic

What does nitrogen fixation involve?

• Converting ammonium ions into nitrate

• Converting ammonia into ammonium ions

• Converting nitrate into nitrogen gas

• Converting nitrogen gas into ammonia

Which enzyme catalyzes the nitrogen fixation reaction?

• Nitrogenase

• Nitrosomonase

• Nitrobacterase

• Pseudomonase

What form of nitrogen can plants easily take up through their roots?

• Nitrogen gas

• Ammonia

• Nitrate ions

• Ammonium ions

What is the role of nitrogen in plants as mentioned in the text?

• To make chlorophyll

• To aid in water absorption

• To strengthen cell walls

• To make amino acids for proteins

What do decomposers feed on?

• Carbon Dioxide

• Living organic matter

• Dead organic matter

• Inorganic matter

How do decomposers digest food?

• Internal digestion

• External digestion

• Photosynthesis

• Respiration

Which of the following is an example of a detritivore?

• Bacteria

• Maggots

• Plants

• Fungi