Plants use light for photosynthesis. Light is composed of several wavelengths th
ID: 47291 • Letter: P
Question
Plants use light for photosynthesis. Light is composed of several wavelengths that correspond to colors that we see, such as red, blue, yellow, and green. Colors that we see are due to reflected wavelengths, so those wavelengths are not absorbed. Early botanists wondered which wavelengths were used by plants for photosynthesis. Because leaves are green, botanists knew that green wavelengths were not absorbed and therefore were not used for photosynthesis. The first experiment placed a blue filter over the light. The blue filter removes the blue wavelengths so they would not be available to the plant for photosynthesis. Based on this description, what is the appropriate null hypothesis?
1)Blue wavelengths are required for photosynthesis.
2)Blue wavelengths are not required for photosynthesis.
3)Red or yellow wavelengths are not required for photosynthesis.
4)Green wavelengths are not required for photosynthesis.
5)Red and yellow wavelengths are required for photosynthesis.
Explanation / Answer
Null hypothesis refers to a general statement which says that their is no relationship between two measured phenomena. Rejection of null hypothesis means that their exists a relationship.
So, the correct null hypothesis will be 2)blue wavelengths are not required for photo synthesis.