Pest Resistant Plants

Question 1

Bt toxin is produced by

Answer 1

Bacterium called Bacillus thuringiensis

Question 2

What does Bt toxin do?

Answer 2

provides resistance to insects without need of insecticides ,which in effect created “bio-pesticide.”

Question 3

Examples of bt toxin

Answer 3

bt cotton, bt rice, tomato ,potato

Question 4

Example of lepidopterans

Answer 4

tobacco ,budworm , armyworm

Question 5

Eg of coleopterans

Answer 5

beetles

Question 6

eg of dipterans

Answer 6

flies,mosquito

Question 7

B. thuringiensis forms ________?

Answer 7

protein crystals

Question 8

why does bt toxin not kill the bacillus?

Answer 8

because once ingested by an insect it is converted into an active form due to alkaline ph of the gut which solubilizes the crystals

Question 9

how does the insect die

Answer 9

the activated toxin binds to the
surface of midgut epithelial cells and creates pores that cause cell swelling

Question 10

Are bt toxins insect group specific

Answer 10

True

Question 11

Which gene codes the toxin

Answer 11

cry gene

Question 12

which gene targets cotton bollworm?

Answer 12

cryIAc , cry II Ab