12th Class Biology Sample Paper Biology - Sample Paper-4

  • question_answer
    Both mycorrhiza and Rhizobium, a bacterium, show mutualism yet they differ from each other in some aspects. Discuss.

    Answer:

    Mycorrhiza is a symbiotic association between fungus and roots of higher plants. Fungus absorbs phosphorus from the soil and passes it to roots of the plants. It also provides resistance against environmental stresses and pathogen attacks. On the other hand, Rhizobium is found in the nodules of leguminous plants and helps to fix atmospheric nitrogen and increases the soil fertility.


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