Experiment testing the effect of different colored lights on flowering plant growth.

Let’s break this down step by step using the diagram and the questions.

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Question 1: According to the diagram, which question is being tested?

Looking at the diagram:

- There are three identical potted plants.
- Each plant is under a different colored light: Red, Green, and Yellow.
- The plants themselves, pots, soil, fertilizer (implied), and setup appear to be the same — only the light color differs.

This is a classic controlled experiment where:
- The independent variable (change variable) = color of light
- The dependent variable (responding variable) = plant height/growth
- The control variables = everything else (pot size, soil type, water, fertilizer, plant species, etc.)

So, the experiment is testing how different colors of light affect plant growth.

Now let’s evaluate the options:

a. Do flowering plants grow taller in red, green or yellow light?
→ ✔ YES — This directly matches what’s being tested. The independent variable is light color; the dependent variable is plant height.

b. How much fertilizer do flowering plants need?
→ ✘ No fertilizer amounts are shown or varied.

c. Does adding fertilizer cause flowering plants to grow taller?
→ ✘ Fertilizer isn’t being added or withheld — it’s not the variable.

d. What is the best kind of soil to make plants grow taller?
→ ✘ Soil type isn’t being changed.

✔ Answer to Question 1: a. Do flowering plants grow taller in red, green or yellow light.

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Question 2: Write “change” in the blank beside the change variable; “responding” beside the responding variable; and “control” beside any control variables.

We’re given two items:

> a. the size of the pot
> b. the kind of potting soil

In the experiment shown:

- The size of the pot is kept the same for all three plants → this is a control variable.
- The kind of potting soil is also kept the same → this is also a control variable.

There is no change in either of these — they are held constant to ensure that any difference in plant growth is due only to the light color.

So we label both as control.

✔ Answer to Question 2:

> control a. the size of the pot
> control b. the kind of potting soil

*(Note: If there were an option like “color of light,” that would be labeled “change.” If “plant height” were listed, it would be “responding.” But here, both given items are control variables.)*

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✔ Final Answers:

1. a. Do flowering plants grow taller in red, green or yellow light.

2.
control a. the size of the pot
control b. the kind of potting soil