Question

Cabbage is a biennial plant which produces flowers in the second year of growth. In an attempt to make it flower in a single year, four potted plants (I, II, III, and IV) of cabbage were subjected to different temperatures for several days given in the table.

Potted plant	Temperature
I	$5^{o}C$
II	${20}^{o}C$
III	${30}^{o}C$
IV	${25}^{o}C$

Which potted plant will show flowering?

• A. I
• B. II
• C. III
• D. IV

Answer 1

The correct option is A I

The low temperature required for vernalization is usually $0^o-5^{o}C$. In nature, the plants requiring vernalization are commonly biennials (e.g., cabbage, sugar canes), which complete their life cycle in two years. They germinate and grow vegetatively in the first year and produce flowers in the second year of growth. These plants fulfill their cold requirement during winters. However, such-biennial plants can be made to flower in one growing season by providing low-temperature treatment (i.e., $0^o-5^{o}C$ temperature) to young plants or moistened seeds.

So the correct answer is 'I'.