STD 12 - 11. organisms and populations — BIOLOGY STD 12 Science — Question

Statement $I$ : Bt toxins are insect group specific and coded by a gene cry $IAc$.

Statement $II$ : Bt toxin exists as inactive protoxin in B. thuringiensis. However, after ingestion by the insect the inactive protoxin gets converted into active form due to acidic $\mathrm{pH}$ of the insect gut.

In the light of the above statements, choose the correct answer from the options given below:

$I.$ availability of resources

$II.$ population density

$III.$ group interaction of organism

Choose the correct combination

$Statement 2$: Certain contraceptives are planted under the skin of the upper arm to prevent pregnancy