Question

A biological control which is effective bio-control agent for several plant pathogens:
(A) Nucleopolyhedrovirus
(B) Tirchoderma
(C) Agrobacterium
(D) Bacillus

Answer 1

Hint: Plant pathogens are the organisms that cause disease of plants. The branch of biology that deals with the scientific study of diseases in plants caused by pathogens and environmental conditions. These pathogens can be different fungi, oomycetes, bacteria, viruses etc.

Complete Answer:
- Bio-control agents are also called biological control agents. The natural enemies that help in controlling plant pests like parasites, nematodes, mites, weeds etc is called biological control.
- Trichoderma is the genus of fungi that is the most prevalent culturable fungi in soil. It is avirulent and is symbiotic. It is used in control of fungal plant disease. Agrobacterium is a gram negative bacteria that is well known for its genetic transfer.
- Bacillus is a gram positive bacteria. It is used to control insect’s pests. The biological control agent for several plant pathogens is Nucleopolyhedrovirus which is the virus that infects pests like butterflies, moths etc.
- The above information provides valuable information about the plant pathogens and from the above information we can conclude that the biological control which is an effective bio-control agent for several plant pathogens is Nucleopolyhedrovirus.

The correct answer is option (A) Nucleopolyhedrovirus.

Note: There are three different methods of biological pest control. These three basic strategies are importation, augmentation and conservation. Importation is also called classical biological control.