Question

Darwin's experiments are just one way to study phototropism. a student wants to investigate the effects of phototropism in bean plants. she places a light source above one plant, at a forty-five degree angle to another, and at a ninety-degree angle from the third.

What is her independent variable?

What is a hypothesis she might write for her experiment?

Thank you

Answer 1

Independent variable: Angle or direction of light

Hypothesis: IF the light is placed on the plant at a particular angle, THEN the plants will grow in that direction

Step-by-step explanation:

In an experiment, the HYPOTHESIS is a testable explanation given to explain an observed problem or to answer a question. According to this experiment,

a student wants to investigate the effects of phototropism in bean plants i.e. how light affects the direction of plant growth. The scientific question is "How does light affect the direction which plant grows?". Therefore, a possible hypothesis will be:

IF the light is placed at a particular angle or direction, THEN the plants will grow in the direction of that light source.

- The independent variable is the variable that the experimenter changes or manipulates in order to effect a measurable response (direction of growth). In this experiment, the DIRECTION OR ANGLE OF THE LIGHT SOURCE IS THE INDEPENDENT VARIABLE.