Trichoderma harzianum has proved a useful microorganism for
Correct answer: B. Biological control of soil-borne plant pathogens
- A. Gene transfer in higher plants
- B. Biological control of soil-borne plant pathogens
- C. Bioremediation of contaminated soils
- D. Reclamation of wastelands.
Explanation
The natural method of pest and pathogen control involving the use of viruses, bacteria, and other insects (which are their natural predators and pests) is called biocontrol or biological control. For example, the 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 a biopesticide. Glomus species are the most common fungal partners of mycorrhiza residing in the roots of higher plants.
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Ecosystems include biotic and abiotic components, food chains and webs, energy flow, nutrient cycles, populations and ecological relationships. Pollution and conservation cover air, water, soil and noise pollution, their effects on organisms, biodiversity loss, protected areas, sustainable resource use and methods for reducing environmental damage.
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