Trichoderma harzianum has proved a useful microorganism for:

gene transfer in higher plants

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biological control of soil-borne plant pathogens

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bioremediation of contaminated soils

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reclamation of wastelands

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Solution

The correct option is B biological control of soil-borne plant pathogens
Trichoderma harzianum is a fungus that is also used as a fungicide. It is used for foliar application, seed treatment and soil treatment for suppression of various disease-causing fungal pathogens. Hence it plays an important role in biological control of soil-borne plant pathogens.

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