Environmental rhythms of light and darkness produce
A
Photoperiodism
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B
Phototropism
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
Phototaxis
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
Vernalisation
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution
The correct option is A Photoperiodism Photoperiodism is the phenomenon in which various physiological reactions response to the relative length of dark or light periods. Environmental rhythms of light and darkness produce this effect. It was discovered by W. W. Garner and H. A. Allard. Short day plants are those plants that begin flowering when the days are shorter than their critical day length. They require long period of darkness and short period of light to flower. Long day plants are those plants that begin flowering when the days are longer than their critical day length. They will flower when they are exposed to short period of darkness and long period of light.