MCQ
Which of the following is correct about viroids$?$
- AThey have free $DNA$ without protein coat.
- BThey have $RNA$ with protein coat.
- ✓They have free $RNA$ without protein coat.
- DThey have $DNA$ with protein coat.
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$(P)$ It is celleid
$(Q)$ It haning nutrients
$(R)$ Its degradation is not possible
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: