Question

1. describe one way to increase the validity of this investigation. wrong answer: have a plant with no light or temperature. validity is how sure you are that the experiment tested what it was supposed to test. check your notes! how can this be made correct? 9.. identify a constant in this experimental design. wrong answer: temperature a constant is something that stays the same in all parts of the experiment. how can this be corrected?

Explanation:

For question 8, to increase validity, control variables precisely. For example, if testing plant - light interaction, keep all other factors like temperature, soil type, and water amount constant. For question 9, a constant should be a specific value or condition. Instead of just saying "temperature", it could be "maintaining a temperature of 25°C throughout the experiment".

Answer:

1. Keep all non - tested variables constant. For example, if testing the effect of light on plants, keep temperature, soil quality and watering amount the same.
2. Specify a fixed value for the constant. For example, if temperature is a constant, state "keep the temperature at 25°C in all parts of the experiment".