NEET BIOLOGY

Detailed explanation-1: -A controlled experiment requires at least two variables: a manipulated variable and a response variable.

Detailed explanation-2: -A controlled experiment works with one variable at a time. If several variables were changed at the same time, the scientist would not know which variable was responsible for the observed results. 3. In a “controlled experiment” only one variable is changed at a time.

Detailed explanation-3: -An experiment is a controlled scientific study of specific variables. A variable is a factor that can take on different values. There must be at least two variables in any experiment: a manipulated variable and a responding variable.

Detailed explanation-4: -Most experimental designs measures only one or two variables at a time. Any other factor, which could potentially influence the results, must be correctly controlled.

Detailed explanation-5: -In a science experiment, only one variable is changed at a time (the independent variable) to test how this changes the dependent variable. The researcher may measure other factors that either remain constant or change during the course of the experiment but are not believed to affect its outcome.