Question

what is the purpose of a control group in an experiment?
a. to measure the dependent variable
b. to ensure the experiment is conducted faster
c. to change the independent variable
d. to serve as a baseline for comparison

in the context of scientific experiments, what does the term \experimental group\ refer to?
a. the group that is measured
b. the group that receives the treatment or test factor
c. the group that is observed
d. the group that is kept constant

what is an example of a hypothesis in a plant growth experiment?
a. plants will grow regardless of the conditions.
b. watering plants will cause them to wilt.
c. if a plant receives more sunlight, it will grow taller.
d. the color of the plant will change if it gets sunlight.

which of the following best describes the dependent variable in an experiment?
a. the variable that is used as a standard for comparison
b. the variable that is deliberately changed
c. the variable that is kept constant
d. the variable that is measured or observed

Explanation:

First Question:

A control group in an experiment is used to have a baseline to compare the experimental group's results. Option a is about measuring dependent variable (not control group's role), b is incorrect (speed not related), c is about independent variable (control group doesn't change it). So d is correct.

Experimental group is the one that gets the treatment/test factor. Option a (measured) and c (observed) can be both groups, d is control group. So b is correct.

A hypothesis should be testable with a cause - effect. Option a is not testable (no condition), b is illogical (watering causes wilting is wrong), d is about color (not growth). Option c has a testable relationship (sunlight - growth).

Answer:

d. To serve as a baseline for comparison

Second Question: