Question

Scientists use various combinations of auxin and cytokinin in plant tissue culture experiments. Choose the correct statement from the options given below regarding the role of both hormone in plant culture medium.

• A. High cytokinin-auxin ratio promotes shoot formation
• B. High cytokinin-auxin ratio promotes root formation
• C. Low cytokinin-auxin ratio promotes root formation
• D. Low cytokinin auxin ratio promotes shoot formation

Answer 1

Answer: (A), (C)

Low cytokinin-auxin ratio promotes root formation

It is well established that the auxin-cytokinin ratio used in culture media determines the degree of shoot and/or root formation in tissue culture. A high ratio of cytokinin to auxin favours shoot production, whereas a high auxin to cytokinin ratio favours root production.