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WAEC Biology 2003 Question 48

Question 48

Nutrient Cycling

Legumes incorporate nitrogen gas into their proteins because

  1. A.of the presence of Azotobacter in their roots
  2. B.they possess root nodules containing Rhizobium
  3. C.they have a well developed root system
  4. D.they are autotrophic
Show the answer and explanation

Answer: B (they possess root nodules containing Rhizobium)

Explanation

Rhizobium bacteria in legume root nodules fix nitrogen gas into compounds the plant uses to make protein. Azotobacter lives free in the soil.