Question

You are a scientist studying the effects of different fertilizers on plant growth.

You conduct the following experiment:

Group 1: You plant one lima bean in a tall plastic cup that contains one cup of fertilizer A. You spray the cup of fertilizer with three squirts of tap water each day. The cup sits in a room that is 72° F and gets four hours of sunlight each day. Every three days the height of the plant is measured in millimeters.

Group 2: You plant one lima bean in a tall plastic cup that contains one cup of fertilizer B. You spray the cup of fertilizer with three squirts of tap water each day. The cup sits in a room that is 72° F and gets four hours of sunlight each day. Every three days the height of the plant is measured in millimeters.

Group 3: You plant one lima bean in a tall plastic cup that contains one cup of soil with no fertilizer. You spray the cup of soil with three squirts of tap water each day. The cup sits in a room that is 72° F and gets four hours of sunlight each day. Every three days the height of the plant is measured in millimeters.

Group 4: You plant one lima bean in a tall plastic cup that contains one cup of fertilizer C. You spray the cup of fertilizer with three squirts of tap water each day. The cup sits in a room that is 72° F and gets four hours of sunlight each day. Every three days the height of the plant is measured in millimeters.

Question 1) What is the independent variable?  

A. Temperature

B. Light

C.Tap Water

D. Fertilizer

E. amount of sunlight

Question 2 What is the dependent variable?

A. the size of the cup

B.the Height of the plant

C. the amount of water

D.the kind of fertilizer

E. amount of sunlight

Answer 1

Ans 1) the correct answer is D. Fertilizer.

It is so because according to the definition of independent variables, they are such variables which get changed or are not fixed in a chemical reaction. Relating this definition along with the experiments above, the group 3 plant contains a cup of soil with no fertilizer whereas all the other groups have fertilizers

Ans 2) the correct option is B. Height of the plant.

According to the definition of dependent variables, they are such entities on which the whole reaction is based or can be said as such variables that are to be detected in a chemical reaction. Here the dependent variable is the height of the plant which is to be measured in millimeters is the main base of the reaction.