Principle

Genetically determined growth processes in plants are primarily triggered or inhibited by special phytohormones. However, external factors such as light, temperature, water, oxygen and air humidity play a decisive role in these processes. With
regard to temperature, there are ranges within which this environmental factor reaches the most favourable value for germination and growth of a plant (preferential or optimum range, preferendum). The effect of different temperatures on the growth of cress (pepper grass, Lepidium sativum) is analysed in this experiment.

Benefits


Precise measurement possible with 12 different temperatures

Allows to set up a wide temperature range

The ring-shaped measurement setup allows an even distribution of all temperature points

Experimental setup can also be used for animal experiments


Tasks


Investigate the effect of soil temperature on the germination of garden cress (Lepidium sativum)

Determine the most favourable value for the germination and growth of cress using a temperature organ.


What you can learn about


Plant germination

Temperature optimum/ maximum/ minimum

Soil temperature

Temperature preferendum