Which of the following elements helps in maintaining the structure of ribosomes?

1. Magnesium

2. Zinc

3. Copper

4. Molybdenum

For its action, nitrogenase requires:
1.  Light
2.  Mn²⁺
3.  Super oxygen radicals
4.  High input of energy

Study the cycle shown below and select the option which gives the correct words for all four blanks A, B, C, and D:

 Options:

Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following statements is not correct during this process of nitrogen fixation:
 

Which one of the following is essential for the photolysis of water?
1. Boron
2. Manganese
3. Zinc
4. Copper

Which one of the following is not an essential mineral element for plants while the remaining three are?
1. Phosphorus
2. Iron
3. Manganese
4. Cadmium

In Glycine max, the product of biological nitrogen fixation is transported from the root nodules to other parts as:

1. Ammonia

2. Glutamate

3. Nitrates

4. Ureides

The deficiencies of micronutrients, not only affect the growth of plants but also vital functions such as photosynthetic and mitochondrial electron flow. Among the list given below, which group of three elements shall affect most, both photosynthetic and mitochondrial electron transport:

1. Ca, K, Na

2. Co, Ni, Mo

3. Mn, Co, Ca

4. Cu, Mn, Fe

All of the following statements concerning the Actinomycetous filamentous soil bacterium Frankia are correct EXCEPT that Frankia:
 

Which of the following is a non–symbiotic nitrogen fixing bacteria?
1.  Rhizobium
2.  Mycorrhiza
3.  Azotobacter
4.  Nitrosomonas