The flowering in plants due to exposure of day and night. It is of 3typesLong day,short day,and day neutral plant

Photoperiodism\tThe response of plants to periods of day/night is termed photoperiodism.\tSome plants require the exposure to light for a period exceding a well-defined critical duration known as long day plants, whereas others must be exposed to light for a period less than this critical duration before the flowering is initiated in them, known as short day plants.\tThe plants in which there is no correlation between exposure to light duration and induction of flowering response; such plants are called day-neutral plants.\tThe site of perception of light/dark duration are the leaves.\tThere is a hormonal substance, which migrates from leaves to shoot apices for inducing flowering only when the plants are exposed to the necessary inductive photoperiod.

Photoperiodism\xa0is the physiological response\xa0of organisms to the length of day or night. In case of plants\xa0Photoperiodism is often\xa0defined as the developmental responses of plants to the relative lengths of light and dark periods. e.g. Plants respond differently to the duration of light for flowering, some plants require long dark hours i.e. less duration of light for flowering & are called short day plants, while some plants require short duration of dark hours i.e. more duration of light for flowering & are called Long day plants.

A response of organism to seasonal change during day
Photoperiodism is the physiological reaction of organisms to the length of day or night. It occurs in plants and animals
Is it phototropism or photoperiodism. ..??