Question

a student designed an experiment to determine if air temperature had an effect on the rate of photosynthesis in corn plants. the independent variable in this experiment is the
a. air temperature at which the corn plants were grown.
b. amount of carbon dioxide used by the corn plants.
c. volume of oxygen produced by the corn plants.
d. number of corn plants used.

scientific law and a scientific theory are similar in that both: *
a. are based on what we expect to happen based on natural history
b. describe the events that can be observed in nature
c. explain why events and conditions occur as they do in the natural world
d. represent a large amount of scientific investigation and evidence

Explanation:

1. In an experiment to determine the effect of air - temperature on the rate of photosynthesis in corn plants, the independent variable is the factor that is deliberately changed. Here, air temperature is being changed to see its effect on photosynthesis. The amount of carbon dioxide used, volume of oxygen produced, and number of corn plants are dependent on other factors or are control variables.
2. Scientific laws and scientific theories are both the result of a large amount of scientific investigation and evidence. Scientific laws describe a phenomenon that occurs under certain conditions, while scientific theories explain why and how a phenomenon occurs. But they both are well - supported by evidence.

Answer:

1. a. air temperature at which the corn plants were grown
2. d. represent a large amount of scientific investigation and evidence