__________________is spontaneous hydrolytic reaction that involves cleavage of the N-glycosylic bond between N-9 of the purine bases A and G and C-1 of the deoxyribose sugar and hence loss of purine bases from the DNA.

TLS Online TPP Program

#Question id: 38833

#Plant Biotechnology

Q. A drawback of DNA/RNA probe-based virus indexing is that it is:

TLS Online TPP Program

#Question id: 38834

#Plant Biotechnology

Q. Which virus detection method is highly specific but less suitable for large-scale screening due to being time-consuming?

TLS Online TPP Program

#Question id: 38835

#Plant Biotechnology

Q. Indicator plants are preferred over direct symptom scoring because:

TLS Online TPP Program

#Question id: 38836

#Plant Biotechnology

Q. Assertion (A): Plants successfully cured of viruses must be strictly maintained in insect-free glasshouses or cages. 

Reason (R): Virus-free plants do not possess inherent immunity and remain highly susceptible to reinfection by vectors

TLS Online TPP Program

#Question id: 38837

#Plant Biotechnology

Q. Assertion (A): In vitro culture is considered the superior method for the maintenance of virus-free plant stocks. 

Reason (R): In vitro methods are more efficient and cost-effective compared to large-scale field multiplication.

TLS Online TPP Program

#Question id: 38838

#Plant Biotechnology

3. Assertion (A): Large-scale multiplication of virus-free plants is ideally conducted during seasons with high insect activity. 

Reason (R): Minimizing exposure to viral risks is essential for maintaining the health of "cured" plant populations.