Homeostasis Experiment Questions

Anika is conducting an experiment to see how different amounts of sunlight affect the growth of plants. What is the factor that Anika changes or manipulates in her experiment?

• Dependent Variable

• Independent Variable

• Control Group

• Constants

Answer explanation

The factor that is changed or manipulated by the experimenter is called the Independent Variable. It is the variable that is intentionally altered to observe its effect on the Dependent Variable.

Tags

NGSS.MS-ETS1-1

Emma is conducting an experiment to see how different amounts of sunlight affect the growth of a plant. Which term describes the factor that is measured or observed in response to changes in the independent variable?

• Hypothesis

• Constants

• Dependent Variable

• Replication

Answer explanation

The term that describes the factor measured or observed in response to changes in the independent variable is the Dependent Variable. It reflects how the outcome changes based on the manipulation of the independent variable.

Tags

NGSS.MS-ETS1-1

Our lab focuses on homeostasis level due to (a)   and the impact on the human body.

• exercise
• stress

• diet

• sleep

Answer explanation

Exercising increases physical activity, leading to a rise in various variables like heart rate and body temperature, which move above homeostasis levels. In contrast, sleeping, eating, and resting do not typically cause such increases.

Tags

NGSS.HS-LS1-3

Maya is feeling stressed and notices an increase in her heart rate. What organ detects the rise in this variable?

• Heart

• Liver

• Brain

• Kidneys

Answer explanation

The brain detects changes in various variables, including temperature and blood pressure, through specialized receptors. It processes this information to maintain homeostasis, making it the correct answer.

Why must both the heart and lungs respond together during physical activity?

• To increase body temperature

• Gas exchange (Carbon Dioxide and Oxygen) and Cell Respiration

• To decrease blood pressure

• To reduce oxygen levels

Answer explanation

During physical activity, the heart and lungs must work together to increase oxygen delivery and carbon dioxide removal, causing a change in the variable of blood oxygen levels and overall efficiency of the body.

Avery and Mason are comparing their resting heart rates after a workout session. What is the purpose of this comparison?

• To practice writing skills

• To understand variations in heart rates

• To learn new vocabulary

• To improve memory

Answer explanation

The purpose of creating a sentence comparing resting heart rates is to understand variations in heart rates. This helps in recognizing how different factors can influence heart rate, which is essential for health assessments.

During a school sports day, Grace noticed her heart rate increased while running a race. Why does heart rate change during exercise?

• To decrease oxygen supply to muscles

• To increase oxygen supply to muscles

• To maintain the same oxygen level

• To reduce energy expenditure

Answer explanation

During exercise, heart rate increases to enhance blood flow, delivering more oxygen to the muscles. This is essential for sustaining energy production and performance, making 'to increase oxygen supply to muscles' the correct choice.

What is the role of the receptor in the homeostatic control mechanism?

• To initiate the response

• To detect changes in the environment

• To control the effector

• To provide feedback to the stimulus

Answer explanation

The receptor's role in homeostasis is to detect changes in the environment, such as temperature or pH levels. This detection is crucial for initiating appropriate responses to maintain balance in the body.

Tags

NGSS.HS-LS1-3

During a school sports day, what happens if Mia's homeostatic control mechanism fails while she is running a race?

• The body maintains normal function

• The body overheats

• The body stops exercising

• The body continues without change

Answer explanation

If the homeostatic control mechanism fails during exercise, the body cannot regulate its temperature effectively, leading to overheating. This can result in heat-related illnesses, making 'the body overheats' the correct answer.

Students wanted to know how plant growth would be affected when given different amounts of water. To setup the experiment, pea plants were potted in the same pots and given the same amount of sunlight. 2 plants received 1/2 a cup of water, 2 plants received 1 cup of water, and the last 2 plants received 2 cups of water daily.

• Independent Variable

• Plant growth

• Dependent Variable

• Amount of water

• Constants

• the same pots and the amount of sunlight

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1