Pre-emergence of seed stalks prior to time of their formation at the cost of bulb formation and development in onion is known as

Answer: Option B

Pre-emergence of seed stalks before the time of their formation at the cost of bulb formation and development in onion is known as Bolting.
It is a serious disorder of onion. It refers to the emergence of seed stalks before the time of their formation and adversely affects the formation and development of bulbs. Bolting is an undesirable character because it directly affects the bulb yield of onion.