Lesson 1

Question 1

What is homeostasis?

Answer 1

The maintenance of stable internal conditions in living organisms

Homeostasis is crucial for the survival of organisms as it regulates factors such as temperature, pH, and ion concentrations.

Question 2

What are the key characteristics of living organisms?

Answer 2

• Made up of cells
• Grow and maintain structure
• Respond to the external environment
• Reproduce and pass on genetic information
• Evolve and adapt as populations

These characteristics define life and distinguish living organisms from non-living entities.

Question 3

What does the Cell Theory state?

Answer 3

• All organisms are made up of one or more cells
• All cells come from pre-existing cells
• The cell is the basic unit of structure and organization

The Cell Theory is fundamental in biology, emphasizing the importance of cells in life processes.

Question 4

What is the scientific method?

Answer 4

A process used by biologists to ask questions, observe, formulate hypotheses, test them, revise, and draw conclusions

The scientific method is essential for conducting structured and repeatable experiments.

Question 5

Define hypothesis.

Answer 5

A testable prediction used to propose a logical experiment

A well-formulated hypothesis can lead to experimental design and further investigation.

Question 6

Provide an example of a hypothesis.

Answer 6

If tomato plants are grown under green light, then their tomatoes will be the heaviest

This statement indicates a proposed relationship between light color and tomato weight.

Question 7

What is an independent variable?

Answer 7

The factor a scientist manipulates in an experiment

Changes in the independent variable are observed to assess their effect on the dependent variable.

Question 8

What is a dependent variable?

Answer 8

The variable that responds to changes in the independent variable

It is measured to determine the effect of the independent variable.

Question 9

What are control variables?

Answer 9

Factors that are held constant in every trial of an experiment

Control variables ensure that the experiment is fair and that results are due to the manipulation of the independent variable.

Question 10

What is a control group in an experiment?

Answer 10

A control group is a sample that undergoes all the same steps in the experiment except the one being tested.

It is essential for establishing cause and effect relationships.

Question 11

Why is a control group necessary in scientific experiments?

Answer 11

A control group is necessary to establish a cause and effect relationship of the independent variable being tested.

It helps to eliminate the placebo effect.