What is true about Bt toxin?

MCQ

What is true about $Bt$ toxin?

A
Bt protein exists as active toxin in theBacillus.
B
The activated toxin enters the ovaries of the pest to sterilise it and thus prevent its multiplication.
C
The concerned Bacillus has antitoxins.
✓
The inactive protoxin gets converted into active form in the insect gut.

✓

Answer

Correct option: D.

The inactive protoxin gets converted into active form in the insect gut.

d
(d) : Soil bacterium Bacillus thuringiensis produces proteins that kill certain insects like lepidopterans (tobacco budworm, armyworm), coleopterans (beetles) and dipterans (flies, mosquitoes). B.thuringiensis forms some protein crystals. These crystals contain a toxic insecticidal protein. This toxin does not kill the Bacillus (bacterium) because it exists as inactive protoxins in them. But, once an insect ingests it, it is converted into an active form of toxin due to the alkaline $pH$ of the alimentary canal. The activated toxin binds to the surface of midgut epithelial cells and create pores that cause swelling and lysis and finally cause death of the insect.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from STD 12 - 10. biotechnology and its application→STD 12 - 10. biotechnology and its application — all question types→Biology STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

STD 12 - 10. biotechnology and its application — Biology STD 12 Science — Question

Answer

Need a full question paper?

Explore more

Similar questions