Which one of the following is a reason why astronomical distances are measured in light-years? 

With reference to recent developments regarding ‘Recombinant Vector Vaccines’, consider the following statements :

1. Genetic engineering is applied in the development of these vaccines.

2. Bacteria and viruses are used as vectors.

Which of the statements given above is/are correct? 

In the context of hereditary diseases, consider the following statements :

1. Passing on mitochondrial diseases from parent to child can be prevented by mitochondrial replacement therapy either before or after in vitro fertilization of the egg.

2. A child inherits mitochondrial diseases entirely from the mother and not from the father.

Which of the statements given above is/are correct?  

Bollgard I and Bollgard II technologies are mentioned in the context of