Answer:
Step-by-step explanation:
Greenhouse is experiment is an experiment under a controlled environment where the environment can be varied according to the desire of the scientist.
For photosynthesis efficiency, Water availability Light intensity Carbon dioxide concentration Plant population density can be manipulated.
Optimum water supply needed for photosynthesis will be added, plant will be expose to adequate Carbondioxide that will be enough to bring about efficiency, the light intensity will be controlled to fits the requirement and reduced when necessary and plant population will be reduced to the number of plant the available resources can carry to bring about efficiency.