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Which of the following can be used as a biocontrol agent in the treatment of plant disease?

1. Trichoderma
2. Chlorella
3. Anabaena
4. Lactobacillus

Correct answer: Trichoderma

Solution

Trichoderma species are widely used as biocontrol agents because they antagonize plant pathogens through competition, parasitism, and antibiosis. The other options are not standard biocontrol fungi for plant disease treatment.

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