Which one of the following will be observed when auxin to cytokinin ratio is increased in the culture medium
Adventitious roots will form.
Adventitious shoots will form.
There will be no root formation.
There will be no shoot formation.
When the auxin to cytokinin ratio is increased, there is a relatively higher concentration of auxin compared to cytokinin in the culture medium. This higher auxin concentration promotes shoot development and inhibits root development. As a result, the increased auxin to cytokinin ratio encourages the formation of adventitious shoots rather than adventitious roots.
Therefore, the correct observation is that adventitious shoots will form when the auxin to cytokinin ratio is increased in the culture medium. Hence, the correct answer is option 2.