In high yielding 'hybrid crop varieties' to exploit hybrid vigour, the farmers need to purchase fresh hybrid seed every year, because

Options

A. they are not allowed to grow their own seed
B. the hybrid vigour is lost due to inbreeding depression
C. the government of India has accepted Dunkel's proposals
D. it is cheaper to purchase fresh seed

Answer

B

Explanation

the hybrid vigour is lost due to inbreeding depression