Question

Differentiate between short day plants and long day plants.

Answer 1

S.No	Short day Plants (SPD)	Long day plants (LDP)
(i)	Plants flower under photoperiods of less than critical day length.	Plants flower under photoperiods of more than critical day length.
(ii)	Interruption during light period does not inhibit flowering.	Interruption during light period inhibits Flowering
(iii)	Flowering is inhibited if long dark period is interrupted midway by a flash of light.	Flowering occurs if dark period is interrupted by light.
(iv)	Long continuous and uninterrupted dark period is critical for flowering.	Light period is critical for flowering.
(v)	Several plants flower under continuous dark if light is supplemented with sucrose.	Several plants flower under continuous light. The dark period is not at all required.