HORTICULTURE

Detailed explanation-1: -The response of a plant to the changing relative length of the day and night is called phototropism.

Detailed explanation-2: -Plant Physiology and Development Photoperiodism is the response to changes in daylength that enables plants to adapt to seasonal changes in their environment. The best studied example of photoperiodism in plants is flowering, but other responses to daylength include bud dormancy and bulb or tuber initiation.

Detailed explanation-3: -Phototropism is the growth of a plant or other organism in response to light, either towards the source of light (positive phototropism) or away from it (negative phototropism). The response of a plant to change in relative length of day and night is called photoperiodism.

Detailed explanation-4: -Negative phototropism is also called as Skototropism. Photoperiodism: Photoperiodism is the response of plants (or any organism) to the lengths of dark and light periods in a day. The changes in the duration of light and dark periods in a day are called photoperiods.

Detailed explanation-5: -Photoperiod is defined as day length or ‘the period of daily illumination received by an organism’ (Concise Oxford Dictionary, 1999) and remains constant between years at any given geographic location.