Answer:
(a) Genetically modified plants can
reduce the usage of chemical pesticides by introducing pest resistant plants e.g.,
There are several nematodes that parasitie, a wide variety of plants and animals
including human beings. A nematode Meloidogyne incognita infects the roots of tobacco
plants and causes a great reduction in yield. A novel strategy was adopted to
prevent this infestation which was based on the process of RNA interference
(RNAi).
Using Agrobacterium vectors,
nematode-specific genes were introduced into the host plant. The introduction
of DNA was such that it produced both sense and antisense RNAin the host cells.
These two RNA's being
complementary to each other formed a double stranded RNA that initiated RNAi
and thus, silenced the specific mRNA of the nematode. The consequence was that
the parasite could not survive in a transgenic host expressing specific
interfering RNA.
(b) Genetically modified plants
can enhance nutritional value of food crops .e.g., 'Golden rice' developed at
Swiss Federal Institute of technology is an example of nutritionally modified
crop. It is rich in vitamin-A (b-carotene),
The rice grains are golden-yellow in colour. It contains 'beta-carotene' gene
from daffodil plant and also from some bacteria. Golden rice can prevent child
blindness which is caused due to the deficiency of vitamin-A.
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