‘Both a short day plant and a long day plant can produce can flower simultaneously in a given place’. Explain.

Photoperiodism governs flowering: short-day plants (SDPs) flower when day length is below their critical maximum, while long-day plants (LDPs) flower only above their critical minimum

Each species has a distinct critical photoperiod—e.g., Xanthium (SDP) flowers if daylength is shorter than ~15.6 h; Henbane (LDP) flowers when daylength exceeds ~11 h

If the local daylength falls within the overlap between these two critical ranges (for instance, 11 to 15.6 hours), both SDP and LDP will receive their respective required conditions simultaneously, leading them to flower together

In practical terms, when the natural photoperiod in a given location is intermediate—say, 12–14 hours—it is “adequate” for both types:

• SDP sees day length ≤ its critical value and flowers

• LDP sees day length ≥ its critical value and also flowers

Thus, without altering light or using artificial manipulation, both short-day and long-day plants can flower simultaneously if the ambient photoperiod coincidentally meets both their thresholds.