Question

keisha did an experiment to study the rate of photosynthesis in the water plant elodea. she placed a piece of elodea in a beaker of water and set the beaker 10 centimeters (cm) from a light source. keisha counted the bubbles released from the plant every minute for five minutes (min). she repeated the process two more times. first, she moved the light to 20 cm from the beaker, and then she moved the light to 30 cm from the beaker. keishas setup and data are shown below. what is the outcome variable (dependent variable) in this experiment? a. the number of bubbles produced b. the type of plant placed in the beaker c. the amount of time the bubbles were counted d. the distance of the light source from the plant in 3 words or less, what is the question asking about? what is 1 thing you know about that concept? what 2 answers choices can you eliminate? what is the correct answer? explain why

Explanation:

The dependent variable is what is being measured. In this experiment, the number of bubbles produced by the Elodea plant is being counted as it is affected by the distance of the light source. The type of plant is constant (Elodea), so B can be eliminated. The amount of time is a controlled variable (5 minutes, counting per - minute), and the distance of the light source is the independent variable that is being changed. So C and D can be eliminated.

Answer:

A. the number of bubbles produced