Select the mismatch:
Column I | Column II | |
1. | Rhodospirillum | Mycorrhiza |
2. | Anabaena | Nitrogen fixer |
3. | Rhizobium | Alfalfa |
4. | Frankia | Alnus |
1. | Ferric | 2. | Ferrous |
3. | Free element | 4. | Both ferric and ferrous |
During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by?
1. Leghaemoglobin
2. Xanthophylls
3. Carotene
4. Cytochrome
Minerals known to be required in large amounts for plant growth include:
1. phosphorus, potassium, sulphur, calcium
2. calcium, magnesium, manganese, copper
3. potassium, phosphorus, selenium, boron
4. magnesium, sulphur, iron, zinc
Deficiency symptoms of nitrogen and potassium are visible first in:
1. Senescent leaves
2. Young leaves
3. Roots
4. Buds
The most abundant intracellular cation is:
1. Ca2+
2. H+
3. K+
4. Na+
Best defined function of manganese in green plants is :
1. Photolysis of water
2. Calvin cycle
3. Nitrogen fixation
4. Water absorption
An element playing important role in nitrogen fixation is:
1. molybdenum
2. copper
3. manganese
4. zinc