Question

You are conducting an experiment on the effects of fertilizer on the growth of three types of plants, all grown from seed. Multiple plants for each type will be grown. Which action must be done to aid your experiment?
Give fertilizer to all the plants of one type, and donÍt give fertilizer to any plants of the other two types.

Give fertilizer to all the plants of two types, and donÍt add fertilizer to any plants of the third type.

For each plant type, either add fertilizer to all the plants or donÍt add fertilizer to any of the plants.

For each plant type, add ferti

Answer 1

To all the plants or don’t add fertilizer to any of the plants.
For each plant type, add fertilizer to some of the plants and don’t add fertilizer to some of the plants.

Answer 2

The correct answer is - For each plant type, either add fertilizer to all the plants or don't add fertilizer to any of the plants.

The best way to conduct the experiment with the different types of plants and the effects of the fertilizer is to add fertilizer to certain number of all types of plants, and for the rest of the plants to not add any fertilizer.

In this manner, in each plant type can be easily seen the effect that the fertilizer will have on their growth, as there will be plants from all three types that have and don't have fertilizer. In this way, a comparison can be made, both between the plants of the same type, and between the plants of different types.