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

Which one of the following is a wrong statement?

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

An element playing important role in nitrogen fixation is:

1. molybdenum

2. copper

3. manganese

4. zinc

Manganese is required in:
1. nucleic acid synthesis
2. plant cell wall formation
3. photolysis of water during photosynthesis
4. chlorophyll synthesis

A plant requires magnesium for:

1. holding cells together

2. protein synthesis

3. chlorophyll synthesis

4. cell wall development

Farmers in a particular region were concerned that pre-mature yellowing of leaves of a pulse crop might cause a decrease in the yield. Which treatment could be most beneficial to obtain maximum seed yield?

Sulphur is an important nutrient for optimum growth and productivity in:

1. pulse crops

2. cereals

3. fibre crops

4. oilseed crops

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