What is the dependent variable in an experiment testing the effects of pH on growth of a seed?
a
Seed growth
b
pH
c
Filter paper
d
Type of seed
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Ответ:
The correct answer is A. Seed growth
Explanation:
Experiments often involve two main variables: the independent variable and the dependent variable. In an experiment, the dependent variable is always the main factor being studied; also, this is "dependent" because it is affected by other factors. In the case presented, the dependent variable is seed growth because this is the specific phenomenon that is being analyzed. Moreover, this factor is affected by the changes in pH. On the other hand, the pH, which is the second factor is the independent variable because this is not affected by the first variable and it is manipulated on purpose.
Ответ:
5. The increase in orbital radius actually decreases the average orbital speed. This is a scientifically proven fact. The increase in orbital radius by 50 percent will decrease the average orbital speed by approximately 18 percent. On the other hand, the decrease in orbital radius will increase the average orbital speed.