Please answer all these 100 points Question 1 (2 points)
How did we define homeostasis?

Question 1 options:

Actively changing due to an environmental stimulus

Taking “raw” materials and turning it into a usable energy

The ability to increase in size and complexity

Regulation of bodily functions to stay within a certain range

Question 2 (2 points)
A hypothesis can be described as

Question 2 options:

a testable explanation.

a theory.

a law.

a wild guess.

Question 3 (2 points)
You notice you begin to sweat whenever the door to your bedroom is closed. This is most closely related to which step in the scientific method?

Question 3 options:

making an observation

forming a hypothesis

forming a conclusion

recording data

Question 4 (2 points)
In an experiment, the variable being tested or changed is the

Question 4 options:

control variable

dependent variable

responding variable

independent variable

Question 5 (1 point)
Match each of the following terms with the correct definition.

Question 5 options:

dependent variable

controls or constants

independent variable

hypothesis

1.
An testable explanation to explain a natural phenomenon

2.
the variables that are held constant in an experiment

3.
the variable that is measured as data in an experiment

4.
the variable that is controlled by the experimenter

Question 6 (2 points)
Some chickens lay an egg every day. Other chickens produce few eggs. A study is planned to examine some factors that might affect the number of eggs produced by chickens. Which of the following is NOT a suitable hypothesis for the study?

Question 6 options:

If the cage for the chickens is larger, they will produce more eggs.

If more eggs are produced by the chickens, they will lose more weight.

If there is more protein in the feed, then more eggs are produced.

If chickens receive more hours of light, then they will produce more eggs.

Question 7 (2 points)
Sam wished to investigate how fertilizer run-off affects the growth of algae in freshwater lakes and streams. He set his experiment up as follows. He placed 900 ml of water into each of five 1000 ml glass beakers. To each beaker, he added 5 ml of water from an aquarium which contained a large concentration of algae. The beakers were placed under a lamp which was on a timer to provide 12 hours of light each day. Liquid fertilizer was added to the beakers in the following amounts.

Beaker

Amount of Fertilizer

A

8 ml

B

6 ml

C

4 ml

D

2 ml

E

0

Each week, a random sample from each of the beakers was examined under a microscope to get a count of the number of algal cells present.

What is the independent variable in this experiment?

Question 7 options:

amount of fertilizer

number of algal cells

hours of daylight

amount of water

Question 8 (2 points)
Sam wished to investigate how fertilizer run-off affects the growth of algae in freshwater lakes and streams. He set his experiment up as follows. He placed 900 ml of water into each of five 1000 ml glass beakers. To each beaker, he added 5 ml of water from an aquarium which contained a large concentration of algae. The beakers were placed under a lamp which was on a timer to provide 12 hours of light each day. Liquid fertilizer was added to the beakers in the following amounts.

Each week, a random sample from each of the beakers was examined under a microscope to get a count of the number of algal cells present.

Beaker

Amount of Fertilizer

A

8 ml

B

6 ml

C

4 ml

D

2 ml

E

0

What is the dependent variable in this experiment?

Question 8 options:

size of beakers

number of algal cells

amount of fertilizer

hours of daylight

Question 9 (2 points)
Sam wished to investigate how fertilizer run-off affects the growth of algae in freshwater lakes and streams. He set his experiment up as follows. He placed 900 ml of water into each of five 1000 ml glass beakers. To each beaker, he added 5 ml of water from an aquarium which contained a large concentration of algae. The beakers were placed under a lamp which was on a timer to provide 12 hours of light each day. Liquid fertilizer was added to the beakers in the following amounts.

Beaker

Amount of Fertilizer

A

8 ml

B

6 ml

C

4 ml

D

2 ml

E

0

Each week, a random sample from each of the beakers was examined under a microscope to get a count of the number of algal cells present.

Which of the following is the control group for the experiment?

Question 9 options:

Beaker D

Beaker C

Beaker E

Beaker A

Beaker B

Question 10 (2 points)
To focus a specimen, it is best to start with which objective:

Question 10 options:

High power

Low power

Scanning

Ocular

Question 11 (2 points)
On the image, which number represents the coarse adjustment knob?

Question 11 options:

1

2

5

10

Question 12 (2 points)
What important feature is missing from this line graph representing sea level change between 1870 and 1990?

Climate change in ten graphs – Channel 4 News

Question 12 options:

X axis label

a title

Y axis label

appropriately spaced scales