Which among the following biocontrol agent is used in the treatment of plant disease ?

Trichoderma

The correct answer is Option (3) →  Trichoderma

A biological control being developed for use in the treatment of plant disease is the fungus Trichoderma. Trichoderma species are free-living fungi that are very common in the root ecosystems. They are effective biocontrol agents of several plant pathogens. By introducing Trichoderma into agricultural systems, it is possible to enhance the natural defense mechanisms of plants against diseases, reduce the reliance on chemical fungicides, and promote sustainable and eco-friendly approaches to disease management.

Micro-organisms such as Lactobacillus and others commonly called lactic acid bacteria (LAB) grow in milk and convert it to curd.

Certain bacteria, which grow anaerobically on cellulosic material, produce large amount of methane along with CO₂ and H₂. These bacteria are collectively called methanogens, and one such common bacterium is Methanobacterium.

The dough, which is used for making bread, is fermented using baker’s yeast (Saccharomyces cerevisiae). The same yeast Saccharomyces cerevisiae is used for fermenting malted cereals and fruit juices, to produce ethanol.