Question

rary Cool Math Games - Parallel Levels - Pla... ntal Variables o Add-ons Help Accessibility All changes saved in Drive Calibri ,11 , BI VA - 123|4 -- E 13 5 Read This! A well-written research question states the independent and dependent variables in the experiment. For example, a student investigated the effect of soil pH on the number of strawberries produced by a strawberry plant. Her research question was "How does the pH of soil affect the number of strawberria produced by a strawberry plant?" 10. Write a research question, using the format suggested in the Read This box, for the experiment Model 2 11. A student wonders, "Does the moisture content in soil affect how far a worm can dig? Identify variables that are being considered in this experiment and the variables that need to be controlled. a. independent b. Dependent c. Controlled Extension Questions 12. Scientists may design an experiment with a control group, which is a set of organisms or samples th hp

Answer 1

Obviously moisture content in soil affects how far a worm can dig.

Independent variables are those which directly or indirectly plays no role affecting a certain thing; whereas dependent variables are directly related affecting a certain thing, and controlled thing are those which can be taken into consideration whenever required.

a. Independent variables- natural vegetation, concentration of some ions, etc.

b. Dependent variables- soil pH, organic matter content, soil porosity, moisture content, temperature, soil type, etc.

c. Controlled variables- external water supply, scientific method of farming, proper ways to irrigate the field, prevention of runoffs discharge effluents from industries, application of biofertilizers, organic farming, etc.

A worm generally lives in moist soil having a good moisture content with optimum pH and it helps to make the land fertile by the deposition of organic matter of soil in the form of humus. So it is also called "Nature's ploughman".