Question

An ecologist observes an alarming number of frogs in agricultural areas that have extra limbs. She hypothesizes that the presence of Round-Up causes frogs to grow extra limbs (this is a real effect of Round-Up!).

She puts 25 tadpoles in an aquarium with pure water and labels these Group A.

She puts another 25 tadpoles in an aquarium with water and Round-Up and labels these Group B.

After all of the tadpoles develop into adult frogs, she counts the number of frogs in each group that have extra limbs.

1. Write a prediction for this hypothesis and experiment.

2. Identify the independent variable and dependent variable.

3. Identify the experimental group and the control group.

4. Name a variable she needs to control for in order to obtain reliable results.

Answer 1

Ans 1- The tadpoles in an aquarium with water and Round-Up, will have extra limbs , and tadpoles in an aquarium with pure water will not have extra limbs. Because presence of Round-Up causes frogs to grow extra limbs.

Ans 2-Dependent variable is extra limbs, Independent variable is Round-Up.

In the presence of Round-Up , frogs grows extra limbs

Independent variables are controlled inputs. Dependent variables represent the output or outcome resulting from altering these inputs.

Ans 3- Group A is a control group and Group B is Experimrntal group.

An experimental group is the group that receives the variable being tested in an experiment. The control group is the group in an experiment that does not receive the variable you are testing.

In gropup A tappoles are in simple water, and in group B tadpoles are in water and Round-Up.

Ans 4- She needs to control round up in order to get the result.

Because presence of Round-Up causes frogs to grow extra limbs.