Applications in agriculture: GMOs, Bt crops
- Silencing of specific mRNA is possible via RNAi because of - Answer: 1. Complementary dsRNA Key idea: RNA interference (RNAi) works through double-stranded RNA. A dsRNA complementary to a specific mRNA... 1
- Given below are two statements: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 co… Answer: 4. Statement I is true but Statement II is false Key idea: Bt toxin is specific to insect groups, and the protoxin is activated in a... 1
- Bt cotton variety that was developed by the introduction of toxin gene of Bacillus thuringiensis (Bt) is resistant to : Answer: 1. Insect pests Key idea: The Bt toxin (Cry protein) kills certain insects. Bt cotton is resistant to insect pests such as cotton bo... 1
- Which of the following is true for Golden rice ? Answer: 1. It is Vitamin A enriched, with a gene from daffodil. Key idea: Golden rice is a biofortified rice rich in provitamin A (beta-caro... 1
- What triggers activation of protoxin to active Bt toxin of Bacillus thuringiensis in boll worm ? Answer: 3. Alkaline pH of gut Key idea: The Bt protoxin is activated by alkaline pH. Bt toxin crystals exist as inactive protoxin. In the al... 1
- Which part of the tobacco plant is infected by *Meloidogyne incognita* ? Answer: 4. Root Key idea: The nematode Meloidogyne incognita infects the roots of tobacco. It causes root-knot galls and reduces yield. In b... 1