Photoperiodism is the reaction of living organisms to the length of day or night.

Short Day Plants (SDP): Short-day plants can only flower when the night lengths exceed their critical photoperiod.

Long-Day Plants (LDP): Long-day plants can flower when the night length falls below their critical photoperiod.

Day Neutral Plants (DNP) : They do not initiate flowering based on photoperiodism.

Classification of the following plants into LDP, SDP and DNP are as follows:

Xanthium:

Henbane: Long Day Plant (LDP)

Spinach: Long Day Plant (LDP)

Rice: Short Day Plant (SDP)

Strawberry: Short Day Plant (SDP)

Bryophyllum: Long Short Day plant (LSDP)

Sunflower: Day Neutral Plant (DNP)

Tomato: Day Neutral Plant (DNP)

Maize:Day Neutral Plant (DNP)