  A simple homemade greenhouse was constructed as a part of the high school
project during the learning-from-home period. The greenhouse was used to show
CO$_2$ absorption by Sansevieria trifasciata during the night, obeying Fick's
law, while the CO$_2$ emission by the medium used to grow the plant does not.
Although other plants can be used for this purpose, the use of Sansevieria is
interesting and offers certain advantages because it absorbs CO$_2$ during the
night. The project could also provide a simple tool for high school students to
investigate the absorption and emission of CO$_2$ from home or in laboratory.
Extension of this project to investigate the effect of plant respiration on the
environmental parameters, such as decreasing temperature and increasing
humidity, is also possible.
