Question

four plants are grown using the same light, soil, humidity, and temperature. plant a: 100% water plant b: 99% water : 1% fertilizer plant c: 98% : 2% fertilizer plant d: 97% water : 3% fertilizer plant height is measured daily for three weeks. how many experiment groups are there?

Explanation:

Step1: Identify experiment groups

Each plant with different water - fertilizer ratio is an experiment group.

Step2: Count groups

There are Plant A, Plant B, Plant C and Plant D. So there are 4 groups.

Answer:

D. 4