![subject](/tpl/images/cats/himiya.png)
You want to test the effect of soil acidity on plant growth. Which of the
following is an example of a controlled experiment to test this?
A. The plant type, amount of light, and amount of water are kept
constant while soil acidity is varied for plants in a greenhouse.
B. The soil acidity of plants in a garden that get light and water from
their surroundings is increased after the plants grow to a height of
100 cm.
C. The plant type, soil acidity, amount of light, and amount of water
are all varied and studied in a laboratory.
D. Soil acidity and height of plants growing in a 10 m2 yard are
measured twice in July and twice in August.
![ansver](/tpl/images/cats/User.png)
Answers: 2
Another question on Chemistry
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.06.2019 10:00
Water's surface tension and heat storage capacity are accounted for by its a) orbitals b) weight c) hydrogen bonds d) mass e) size
Answers: 2
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.06.2019 11:00
Which statement is true about hcl? (5 points) select one: a. it is a salt because it increases the concentration of metallic ions. b. it is a salt because it is formed by the reaction of an acid and a base. c. it is an acid because it increases the concentration of hydroxyl ions. d. it is an acid because it increases the concentration of hydronium ions.
Answers: 1
![question](/tpl/images/cats/himiya.png)
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.06.2019 12:00
What is the subscript for oxygen in its molecular formula
Answers: 1
You know the right answer?
You want to test the effect of soil acidity on plant growth. Which of the
following is an example o...
Questions
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/ekonomika.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/biologiya.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 22.04.2021 15:40
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.04.2021 15:40
![question](/tpl/images/cats/en.png)
English, 22.04.2021 15:40
![question](/tpl/images/cats/mat.png)
Mathematics, 22.04.2021 15:40
![question](/tpl/images/cats/mat.png)
Mathematics, 22.04.2021 15:40
![question](/tpl/images/cats/mat.png)
Mathematics, 22.04.2021 15:40
![question](/tpl/images/cats/ekonomika.png)
![question](/tpl/images/cats/obshestvoznanie.png)
Social Studies, 22.04.2021 15:40
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/obshestvoznanie.png)
Social Studies, 22.04.2021 15:40
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/biologiya.png)
![question](/tpl/images/cats/ekonomika.png)
![question](/tpl/images/cats/geografiya.png)