Question

Sara and Juan conducted an experiment to test which soil would be BEST for growing plants. They used all three types of soil seen in the jar: sand, silt, and clay. They also made a mixture of soil using equal parts of sand, silt, and clay. They planted bean seeds in four pots and placed the pots in the sunlight. They watered the pots every day and tracked the seed germination and plant growth. What was the manipulated variable in this experiment?
A) type of soil
B) plant growth
C) amount of soil in the pots
D) time needed for germination

Answer 1

a) type of soil and d )time needed for germination

Answer 2

A) Type of soil was the manipulated variable in this experiment.