Bt toxin is
The correct option is (D) Protein
Bacillus thuringiensis, also known as Bt, is a bacterium that lives in the soil and generates a naturally occurring toxin that is lethal to certain herbivorous insects. Bacillus thuringiensis (Bt) is a bacterium that produces a toxin that may be used as an insecticide spray and is often used in organic farming. It is also the source of the genes that are employed in the genetic modification of a variety of food crops in order to get them to create the toxin on their own in order to ward off a wide variety of insect pests.
Bacillus thuringiensis (Bt) generates proteins that are poisonous to insects. They do this by secreting poison into the extracellular space. This toxin is a crystalline protein that, when consumed by insects, may clog the digestive tract. As a result, it is used extensively as a biological pesticide, and in fact, Bt toxin is the biological pesticide that is used most broadly worldwide. The application of Bt may take place in one of two ways. Either it is sprayed on crops or it is incorporated into the DNA of genetically engineered crops.
Thus, Bt toxin is the most popular bio-pesticide. It is a crystal protein having insecticidal properties produced by the bacterium Bacillus thuringiensis.
Bt toxin is a protein.