Biology, 03.06.2021 15:40 caleelwittmann31

A massive increase in the growth of a specific species of algae resulted in record-breaking levels of a potentially dangerous toxin being released into the water. A researcher hypothesizes that the unusual growth of this algal species was caused by an increase in water temperature. The researcher designs an experiment to test the hypothesis. Which of the following is the dependent variable in the researcher's experiment? a. The growth of the algae
b. The temperature of the water
c. The concentration of toxin in the water
d. The different species of algae growing in the water

Answers: 3

Show answers

Answers

Answer from: ruddymorales1123

a. The growth of the algae

Explanation:

The researcher already knows that the over-growth of algae species results in excessive levels of a potentially dangerous toxin being released. But he/she wants to know what is causing this algae over-growth. The principal hypothesis is that the increase in water temperature is the cause of the unusual growth of this algal species. The researcher hypothesizes that the higher the temperature levels are, the more growth rate the algae will exhibit.

So in this experiment, the researcher can voluntarily modify the temperature in order to see how it changes the algae growth.

Before answering the question, let us remember a few concepts.

Independent (manipulated) variable refers to all the variables in an experiment that provoke a response in another variable. An independent variable is the one that changes or is controlled and modified in the experiment to analyze how another variable responds to it. It changes to analyze its effects on the dependent variable. Usually, the independent variable is represented by the X letter. The Dependent variable reacts to any modification of the independent variable. Any change in the manipulated variable provokes a proportional or inversely proportional change in the dependent variable. It represents the quantity of something, such as height, weight, length, rate, etc. It is usually identified by the letter Y.

Now, let us analyze the options.

c. The concentration of toxin in the water. This is a dependent variable, which depends on the algae growth. The more algae present, the more toxins. However, this is not what the researcher is studying. He/She wants to know what is causing the increase in algae. So toxins, in this study, would be a secondary effect.

d. The different species of algae growing in the water . Probably this is also related to temperature and the biology of each algal species. However, the researcher is interested in a specific species of algae.

b. The temperature of the water. The temperature of THE water is directly involved in this experiment, but as the INDEPENDENT VARIABLE. The researcher will modify the temperature in order to know how it changes the algae growth. The researcher voluntarily modifies this variable, and this change provokes a change in the dependent variable.

a. The growth of the algae. The Growth of THE algae is the DEPENDENT VARIABLE. It CHANGES ACCORDING TO THE TEMPERATURE. So the change in the algae growth will depend on how the researcher modifies the temperature. We are referring to one specific algal species. This species is responsible for the toxins´ productions and is suggested to depend on temperature.

Answer from: Quest

b.have there own function.

Answer from: Quest

The short-term effect of tar on the body is increased blood pressure.

Another question on Biology

Biology, 22.06.2019 00:00

An organ system consists of a group of organs that performs specific functions necessary for the survival of an organism. humans have eleven different organ systems: integumentary, skeletal, muscular, nervous, endocrine, circulatory, lymphatic, respiratory, digestive, urinary, and reproductive. discuss the function of neurons, the brain and the spinal cord within the human nervous system while explaining the interrelationship of each organ.

Answers: 1

Answer

Biology, 22.06.2019 05:30

Where can a dna be found in a prokaryotic cell

Answers: 1

Answer

Biology, 22.06.2019 06:00

Sarah and john are having a discussion on genetic diversity. sarah believes that it happen over a long period of time. john it happens immediately. who is correct? a. sarah is correct because genetic diversity occurs over a long period of time. b. john is correct because genetic diversity occurs immediately. c. both are correct because genetic variation can occur or long period of time. d. neither are correct because genetic diversity occurs over any period of time

Answers: 1

Answer

Biology, 22.06.2019 09:00

How does science influence the decisions made about social, economic, and political issues?

Answers: 1

Answer

You know the right answer?

A massive increase in the growth of a specific species of algae resulted in record-breaking levels o...

Questions