Atmosphere in a bag is a great way to isolate factors that contribute to plant growth.  We are able to place plants in different parts of the room and collect growth data to determine what factors contribute most to plant growth.  By weighing the soil and measuring the amount of water used, we are able to determine where the plant matter is coming from.

Transition to this lesson after germination and parts of a plant.  Students should understand what is happening inside seed as it absorbs water from the soil.

5-LS1-1. Support an argument that plants get the materials they need for growth chiefly from air and water.