Question

which experimental procedure would provide the best evidence for the effect of light on plant growth? (1 point) plant seeds of the same variety in the same conditions and vary only the amount of light, then measure plant growth. plant seeds in different soils and expose them to different amounts of light, then measure plant growth. measure plants receiving different amounts of light in their natural environments. measure plants of the same variety grown in environments that receive different amounts of light.

Explanation:

To determine the effect of light on plant growth, a controlled experiment is needed where only the independent variable (light) is varied, and other factors (like seed variety, soil, etc.) are kept constant. The first option plants the same variety of seeds in the same conditions and only varies light, which is a controlled experiment. The second option varies soil and light, introducing multiple variables. The third and fourth options don't control other factors (like soil, nutrients in natural environments or other environmental factors in the fourth option) as strictly as the first.

Answer:

A. Plant seeds of the same variety in the same conditions and vary only the amount of light, then measure plant growth.