Plant A, Plant B are the experimental subjects
Plant C is the control subject
The controlled variables are Temperature, Humidity and Water
Explanation:
As mentioned in the question the whole procedure is an experimental set-up where experiments are being done to test the growing condition of plants under a controlled environment. The various parameters such as Temperature, Humidity, Water, Light and colour of light are fixed. Following these controlled conditions different plants exhibit different growth after a period of three weeks.
3). The Plants which are experimental subjects are Plant A, plant B, Plant C
4).Plant C is the control subject since it is kept in the ordinary light conditons (i.e. white light)
5). The Controlled variables include Temperature, Humidity and Water content.
