Tomato Plant Growth
Marissa wanted to see how the amount of water given to tomato plants affected their growth. She had six tomato plants that she split into two groups of three. She watered each plant in group 1 with 300ml of distilled water per day. Group 2 plants each received 500ml of distilled water each day. She measured each tomato plant’s height after 30 days and recorded her findings in the table below.
Group 1 - Plant A = 20 Plant B =25 Plant C =18
Group 2 - Plant A = 32 Plant B 38 Plant C = 44
1. What is the average height in cm for plants in group 1? *
18 cm
21 cm <----
42 cm
63 cm
2. What is the average height in cm for plants in group 2? *
38 cm <---
56 cm
97 cm
114 cm
3. Identify the independent variable in his experiment. *
Type of plant
Height of the plants <---
Amount of water
30 days
4. Identify the dependent variable in his experiment. *
Type of plant <----
Height of the plants
Amount of water
30 days
5. Which of the following correctly lists constants that are used or should be used in this experiment? *
Amount of water, final height of the plants, using three groups
Type of plant, using distilled water, type of soil, amount of sunlight exposure, how the plants are measured
Height of the plant, amount of water, using different pots
Type of plant, using different pots, using different amounts of soil
1 and 2 are correct.
I believe you should rethink 3 and 4
See this link.
https://www.thoughtco.com/independent-and-dependent-variables-differences-606115
Okay, Thanks!
Amount of water, final height of the plants, using three groups
The correct answer for question 1 is 21 cm. To find the average height for plants in group 1, you need to add up the heights of each plant in group 1 (20 + 25 + 18 = 63) and divide by the number of plants in group 1 (3). So, the average height is 63 / 3 = 21 cm.
Similar explanation applies to question 2. The correct answer for question 2 is 38 cm. To find the average height for plants in group 2, you need to add up the heights of each plant in group 2 (32 + 38 + 44 = 114) and divide by the number of plants in group 2 (3). So, the average height is 114 / 3 = 38 cm.
For question 3, the independent variable in this experiment is the amount of water given to the tomato plants. The independent variable is the one that is deliberately manipulated or controlled by the researcher, in this case, Marissa.
For question 4, the dependent variable in this experiment is the height of the tomato plants. The dependent variable is the outcome or response that is measured, in this case, the height of the tomato plants.
For question 5, the correct answer is "Type of plant, using distilled water, type of soil, amount of sunlight exposure, how the plants are measured." In a good experiment, it is important to control or keep constant certain factors that could potentially affect the outcome. In this case, the constants would include things like the type of plant used, using distilled water, using the same type of soil, ensuring consistent sunlight exposure, and using a consistent method for measuring the plants.