Chapter 25, Problem 2AAATB

Summary Introduction

To write:

The process to induce poinsettia to bloom during the summer.

Introduction:

A biological response that is bound to a change in the proportion of light and dark within a 24-hour cycle called Photoperiodism. Poinsettia belongs to a short-day plant because it will not flower if day length surpasses a critical value. Short-day plants tend to bloom when day length is short. Poinsettia flower in the month of December. Long-day plants bloom only if day length is longer than a critical value. Long-day and short-day plants are actually reacting to the concentrations of two forms of a protein called phytochrome.