Question

Which of the following is a transgenic plant?

• A. Nicotiana tabacum
• B. Meloidogyne incognita
• C. Agrobacterium tumefaciens
• D. Caenorhabditis elegans

Answer 1

The correct option is A Nicotiana tabacum

Transgenic plants are plants into which one or more genes from another species have been introduced into the genome with the help of genetic engineering tools and techniques.
There are different varieties of transgenic plants that are created to get the yield of choice, like flavr savr tomato, golden rice, tobacco plants, etc.
A nematode Meloidogyne incognita is a parasite that commonly infects the roots of the tobacco plants. Meloidogyne incognita reproduces on the roots of the tobacco (Nicotiana tabacum), damaging the crop and reducing the crop yield causing annual losses economically. The development of resistant genotypes is an alternative strategy to control these losses.
A novel strategy was adopted on the basis of RNA interference (RNAi), by which the mRNA of the parasite is destroyed and hence no proteins are synthesised, which results in the death of the nematode in the transgenic host.
Only the first option is a plant species. Meloidogyne incognita & Caenorhabditis elegans are nematodes, Agrobacterium tumefaciens is a gram negative bacteria.