Question

resources which can be put into use with the help of existing technical 'know how' but their use has not been started​

Answer 1

Answer:stokes are resources that exists but have not been utilized owing to lack of technical expertise.

Eg:making hydrogen and oxygen from water

Reserves are resources for whose utilization man has the technical know how but has not started using them

Eg:uses of river water for generating electricity

As you see (from example),stock resources on knowing technical utilization become reserves

Answer 2

Answer:

Reserves are the subset of the stock, which can be put into use with the help of existing technical 'know-how' but their use has not been started. These can be used for meeting future requirements...