Given that the two factor of production are employed in a fixed proportion in the production process, what will be the shape of the corresponding isoquants and the value of the MRTS as more and more units of one factor of production is employed keeping constant the other factor of production?

Given that the two factor of production are employed in a fixed proportion in the production
process, what will be the shape of the corresponding isoquants and the value of the MRTS as
more and more units of one factor of production is employed keeping constant the other factor
of production?