Question

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

• 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 1

The correct option is B

the hybrid vigour is lost due to inbreeding depression

Explanation of correct option

The correct option is B.

1. The phenomenon of hybrid vigour, also known as heterosis, occurs when the F1 generation produced by a cross between inbreed lines outperforms the parental lines.
2. Because hybrid vigour does not last long due to inbreeding depression, the farmer must acquire new hybrid seeds every year.
3. As per the dominance hypothesis of inbreeding depression, intercrossing inbreeds will result in a hybrid with one parent's harmful recessives masked by dominant alleles given by the other parents.

Final Answer: In high-yielding hybrid crop varieties' to exploit hybrid vigour, the farmers need to purchase fresh hybrid seen every year because the hybrid vigour is lost due to inbreeding depression.