Class XI

Name the best known symbiotic nitrogen fixing bacterium is
  1. Azotobactor
  2. Nitrobacter
  3. Rhizobium
  4. Nitrosomonas
The morphological changes are indicative of certain element deficiencies and are called
  1. Translocation
  2. Mineral nutrition
  3. deficiency symptom
  4. Protein synthesis
In plant, nitrate is reduced to ammonia state in two steps. In second step electrons are donated by
  1. Nitrate reductase
  2. Cytochrome b5
  3. Nitrite reductase
  4. Ferredoxin
Element required for nitrogen metabolism is
  1. Molybedenum
  2. Copper
  3. Manganese
  4. Zinc
Micronutrients are otherwise called as
  1. Structural elements
  2. Mineral elements
  3. Trace elements
  4. Beneficial elements
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