Question

Thurioside is 
A. Insecticide
B. Fungicide
C. Antibiotic
D. Weedicide

Answer 1

Hint: Bacillus thuringiensis (Bt) is a species of bacteria that resides in soil. It creates proteins that are toxic to some insects when consumed, but not others. The proteins are not toxic to people because, like all mammals, we can't activate them. Bt is not toxic to non-target wildlife.

Complete step-by-step answer:
Thurioside is a toxin generated by bacterium Bacillus thuringenesis. Bt toxins are initially inactive protoxins but after ingestion by the insects, their inactive toxin becomes active because of the alkaline pH of the gut, which solubilises the crystals. The activated toxin binds to the surface of the midgut, and epithelial cells swelling and lysis, further results in the death of the insect. It is used as an insecticide as it is very effective against disease-causing insects such as moths, flies, mosquitos, etc.
Fungicides are pesticides that destroy or prevent the growth of fungi and their spores. They can be used to control fungi that harm plants, including mildews, rusts, and blights.
Antibiotics are a common medication that physicians prescribe to combat bacteria. Antibiotics are powerful medicines that fight specific infections and can save lives when they are used properly. They either stop bacteria from breeding or destroy them.
Weedicides are used to control the growth of weeds. Weedicides are sprayed in the fields to destroy the weeds.

Therefore the correct answer is Option A.
Note: Thurioside toxin is produced in the type of crystal protein. The toxin helps by killing the insects or pests by inhibiting the transport of ions, and the formation of pores in the gut which finally leads to the bursting of cells. This gene for toxin is also introduced in transgenic plants which provide resistance to the crops from pests.