Question

Tobacco plants resistant to a nematode have been developed by the introduction of DNA that produced (in the host cells):

• A. Both sense and anti-sense RNA
• B. A particular hormone
• C. An antifeedant
• D. A toxic protein

Answer 1

The correct option is A Both sense and anti-sense RNA

Using Agrobacterium vectors, nematode-specific genes are
introduced into the host plant. The introduction of DNA was such that it produced both sense and anti-sense RNA in the host
cells. These two RNA’s being complementary to each other formed a double stranded (dsRNA) that initiated RNAi and thus, silenced the specific mRNA.

Antifeedant - a naturally occurring substance in certain plants which adversely affects insects or other animals which eat them.