1. | Aerobic nitrate oxidation, and nitrite reduction |
2. | Decomposition of organic nitrogen, and conversion of dinitrogen to ammonium compounds |
3. | Enteric fermentation in cattle, and nitrogen fixation by Rhizobium in root nodules of legumes |
4. | Anaerobic ammonium oxidation, and denitrification |
Read the following four statements (I-IV):
I. | Both, photophosphorylation and oxidative phosphorylation involve uphill transport of protons across the membrane |
II. | In dicot stems, a new cambium originates from cells of pericycle at the time of secondary growth |
III. | Stamens in flowers of Gloriosa and Petunia are polyandrous |
IV. | Symbiotic nitrogen-fixers occur in a free-living state and also in soil |
How many of the above statements are right?
1. Three
2. Four
3. One
4. Two
1. convert free nitrogen to nitrogen compounds
2. convert proteins into ammonia
3. reduce nitrates to free nitrogen
4. oxidize ammonia to nitrates
The free-living, anaerobic nitrogen-fixer is:
1. Beijerinckia
2. Rhodospirillum
3. Rhizobium
4. Azotobacter
Study the cycle shown below and select the option which gives the correct words for all four blanks A, B, C, and D:
Options:
A | B | C | D | |
1. | Denitrification | Ammonification | Plants | Animals |
2. | Nitrification | Denitrification | Animals | Plants |
3. | Denitrification | Nitrification | Plants | Animals |
4. | Nitrification | Ammonification | Animals | Plants |
Which of the following is a symbiotic nitrogen fixer?
1. Glomus
2. Azotobacter
3. Frankia
4. Azolla
1. | Bradyrhizobium | 2. | Clostridium |
3. | Frankia | 4. | Azorhizobium |
Which of the following is a flowering plant with nodules containing filamentous nitrogen-fixing microorganism?
1. Casuarina equisetifolia
2. Crotolaria juncea
3. Cycas revoluta
4. Cicer arietinum