Nitrogen Metabolism

1. 1. .............. is the process by which atmospheric nitrogen is converted to ammonia .

• a. Ammonification

• b. Nitrogen Fixation

• c. Nitrification

• d. Denitrification

2. 2. .............. occurs when a plant or animal dies or excretes waste.

• a. Denitrification

• b. Nitrification

• c. Ammonification

• d. N2 fixation

3. 3. Nitrosomonas and Nitrobacter are called ................................ bacteria

• a. Nitrifying

• b. Denitrifying

• c. Non-symbiotic

• d. None of these

4. 4. ............................ is denitrifying bacteria.

• a. Nitrococcus

• b. Nitrobactor

• c. Nitrosomonas

• d. Pseudomonas

5. 5. Nitrification is the process that converts ........ to ........... and then to .........

6. 6. ................. and ................ are two enzymes that assist plants in absorbing ammonia and nitrates.

• a. Amylase and Ligases

• b. Nitrogenase and Nitrate reductase

• c. Maltase and Amylase

• d. Maltase and Ligases

7. 7. ................... is ammonifying bacteria

• a. Bordetella pertussis

• b. Escherichia coli

• c. salmonella typhi

• d. Bacillus ramosus

8. 8. .............% of Nitrogen present in atmosphere.

• a. 78

• b. 77

• c. 60

• d. 68