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STD 12 - 8. microbes in human welfare — Biology STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceBiologySTD 12 - 8. microbes in human welfare1 Mark
MCQ
Trichoderma harzianum has proved a useful microorganism for
  • A
    gene transfer in higher plants
  • ✓
    biological control of soil­borne plant pathogens
  • C
    bioremediation of contaminated soils
  • D
    reclamation of wastelands.
✓

Answer

Correct option: B.
biological control of soil­borne plant pathogens
b
(b) : The natural method of pest and pathogen control involving use of viruses, bacteria and other insects (which are their natural predators and pests) is called biocontrol or biological control. For example, free living fungus Trichoderma exerts biocontrol over several plant pathogens for the control of plant diseases. Baculoviruses (mostly of genus Nucleo­ polyhedrovirus) are also used as biocontrol agents but they are used for the control of insects and arthropods. Bacillus thuringiensis is a soil bacterium which is used as biopesticide. Glomus species are the most common fungal partners of mycorrhiza residing in the roots of higher plants.

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