Final answer:
Gary conducted an experiment to determine the relationship between plant growth and sunlight exposure. His hypothesis was that plants that get more sunshine grow larger. He used controlled conditions, including plants of the same size and type, and containers of the same size, to eliminate potential variables.
Step-by-step explanation:
The question is about an experiment conducted by Gary to determine the relationship between plant growth and sunlight exposure. Gary hypothesized that plants that get more sunshine grow larger than plants that get less sunshine.
He set up an experiment with ten small plants of the same size and type, ensuring they had the same size and type of pot. By exposing some plants to full sun and others to the shade, Gary could observe the effect of sunlight on plant growth. This controlled experiment allowed him to test his hypothesis.
Gary insisted on using containers of the same size to eliminate container size as a variable that could affect plant growth. This ensures that any differences in plant size can be attributed to the sunlight exposure and not the container size. Having the same size containers also helps in making fair comparisons between plant growth.
Gary insisted that all plants receive the same amount of water every day because he wanted to test the effect of shade on plant growth. By keeping the water amount constant, he minimizes the influence of water availability as a variable and can focus solely on the effect of shade on plant growth.