The first stable product of fixation of atmospheric nitrogen in leguminous plants is

  • NO2-

  • ammonia

  • NO3-

  • glutamate

Sulphur is an important nutrient for optimum growth and productivity in

  • pulse crops

  • cereals

  • fibre crops

  • oilseed crops

Examination of blood of a person suspected of having anaemia, shows large, immature, nucleated erythrocytes without haemoglobin. Supplementing his diet with which of the following is likely to alleviate his symptoms?

  • Thiamine

  • Folic acid and cobalamine

  • Riboflavin

  • Iron compounds

Nitrogen-fixation in root nodules of Alnus is brought about by

  • Bradyrhizobium

  • Clostridium

  • Frankia

  • Azorhizobium

Manganese is required in 

  • nucleic acid synthesis

  • plant cell wall formation

  • photolysis of water during photosynthesis

  • chlorophyll synthesis

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