Scientists tested the effect of a fertilizer on the growth of plants. They had 2 sets of plants, Group A which gets fertilizer,
water and sun and Group B which gets only water and sun (but in equal amounts to Group A). 1. Explain how this scenario is a controlled experiment and identify the manipulated variable.
2. If the scientists only performed 1 experiment but it supported their hypothesis, why can it not be considered a theory?
3. The graph below was created showing the growth of the plant. How would you know that the y-axis is measuring the growth of the plant?
1. This scenario is controlled due to the fact that they usually <span>test the effect of fertilizer, water and sunlight. Two last points pose as explanation for the second part of question. 2. It </span>can not be considered a theory because often it is supported by <span> hypothesis, so it's not direct thesis. 3. The way to know </span>that the y-axis is measuring the growth of the plant is to look at the graph and see that it <span>shows plant growing up.</span>
