Potato is a . . . . . . . . day plant but it is cultivated as . . . . . . . . day plant for its tuber, respectively.

Solution (By Examveda Team)

Potato is a long-day plant but it is cultivated as a short-day plant for its tuber, respectively.
Tuberization in potatoes (Solanum tuberosum L.) is a complex biological phenomenon that is affected by several environmental cues, genetic factors and plant nutrition.
In the case of potatoes, it requires more photoperiod to induce flowering. Whereas the formation of a tuber requires very less photoperiod. Thus, it is told that potato is LDP (Long day plant) for inducing flowering; but SDP for tuber formation.