Which of the following statements is correct with regard to biocontrol...
Ladybird and dragonflies are used to get rid of aphids and mosquitoes respectively. Bacillus thuringiensis bacteria are used to control utterfly caterpillars. Trichoderma species are used to control several plant pathogen..
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Which of the following statements is correct with regard to biocontrol...
Introduction:
Biocontrol agents are organisms that are used to control pests, diseases, and weeds in agriculture and other ecosystems. They are a sustainable and environmentally friendly alternative to chemical pesticides. In this question, we are given four statements about biocontrol agents and asked to choose the correct one.
Explanation:
Statement a: Ladybird and dragonflies are used to get rid of aphids and mosquitoes respectively.
Explanation:
Ladybirds are commonly used as biocontrol agents to control aphids, which are pests that damage crops. Ladybirds feed on aphids and help in reducing their population. Dragonflies, on the other hand, are natural predators of mosquitoes. They feed on mosquito larvae, helping to control their population. Therefore, statement a is correct.
Statement b: Bacillus thuringiensis bacteria are used to control butterfly caterpillars.
Explanation:
Bacillus thuringiensis (Bt) is a type of bacteria that produces toxins that are harmful to certain insect pests, including butterfly caterpillars. When these bacteria are ingested by the caterpillars, the toxins disrupt their digestive system, leading to their death. Bt is commonly used as a biocontrol agent to control butterfly caterpillars in agricultural settings. Therefore, statement b is correct.
Statement c: Trichoderma species are used to control several plant pathogens.
Explanation:
Trichoderma is a genus of fungus that is known for its biocontrol properties. It has the ability to suppress the growth of various plant pathogens, including fungi, bacteria, and nematodes. Trichoderma species produce enzymes and secondary metabolites that inhibit the growth of pathogens and promote plant growth. They are commonly used as biocontrol agents in agriculture to control diseases caused by plant pathogens. Therefore, statement c is correct.
Conclusion:
From the explanations provided above, it can be concluded that all of the given statements (a, b, and c) are correct. Therefore, the correct answer is option 'D' - All of these.
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