This set of Agricultural Biotechnology Multiple Choice Questions & Answers (MCQs) focuses on “Genetic Engineered Resistance against Viral Infection”.
1. The lack of viricides leads to the restriction of virus infection as the only practical method control.
a) True
b) False
View Answer
Explanation: There are over seven hundred plant virus recognized for causing various diseases and significant crop losses. Various strategies have been developed for protecting viral infection such as coat protein mediated protection.
2. The phenomenon of a susceptible strain developing resistance against virulent strains is called ________
a) Replicase mediated protection
b) Antisense RNA mediate protection
c) Cross protection
d) Coat protein mediated protection
View Answer
Explanation: If susceptible strain of a crop is inoculated with a mild strain of a virus, the susceptible strain, as a result develops resistance against more virulent diseases. This method has been used to reduce yield losses in crops like tomato, potato, etc.
3. Cross protection can be used to prevent citrus against citrus tristeza virus.
a) True
b) False
View Answer
Explanation: Cross protection technique can be used to protect tomatoes against tomato mosaic virus (TMV) and to protect potato against potato spindle tuber viroid.
4. Which of the following is not a disadvantage of cross protection?
a) Mutation
b) Synergism
c) Spread of virus
d) Yield losses
View Answer
Explanation: Cross protection reduces yield losses. The disadvantages include the possibility of mutation in including mild virus strain and the possibility of synergism between virus and another unrelated virus.
5. Which among the following is a first approach towards Replicase mediated protection?
a) Replication and cell to cell movement of virus
b) Transgenic expression of the anti-virus protein
c) Genetic manipulation of natural viral defences in plants
d) Isolation of the resistance genes
View Answer
Explanation: Replicase mediated protection is one of the methods for engineered resistance against viral infection. It has been discovered that transgenic tobacco expressing part of Replicase gene of TMV strain was highly resistant to this and closely related strains.
Sanfoundry Global Education & Learning Series – Agricultural Biotechnology
To practice all areas of Agricultural Biotechnology, here is complete set of 1000+ Multiple Choice Questions and Answers.
If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]
