Introduction to Biology

The variable that is changed by the scientist to test a hypothesis is called the _________________________

• dependent variable

• independent variable

• control

• control group

Tags

NGSS.MS-PS3-1

A cow is given a growth hormone and then compared to another cow that was not given a growth hormone. Both cows were weighed at two years. The independent variable is:

• The number of years

• the weight of the cows

• the growth hormone

• The number of cows

Tags

NGSS.MS-LS1-5

A cow is given a growth hormone and then compared to another cow that was not given a growth hormone. Both cows were weighed at two years. The dependent variable is:

• the number of years

• the weight of the cows

• the growth hormone

• the number of cows

Tags

NGSS.MS-LS1-5

Mark and Rosa investigate different ways to grow tomatoes. They use three types of tomato plants and different amounts of fertilizer. They water each plant with 20mL of water every day. They recorded the growth of each plant every day. Mark and Rosa decide that the Big Boy and Beefsteak tomatoes grow best, but their results cannot be reproduced. Which mistake did they make?

• They would have better results if they only used one type of tomato.

• Every plant is an individual, just like people, so some grow faster than others.

• Mark and Rosa needed to water their plants every day to get better results.

• Mark and Rosa needed to use the same amount of fertilizer.

Tags

NGSS.MS-LS1-5

Should experiments be repeated over and over to see if the results are the same each time?

• yes

• no

Tags

NGSS.MS-ETS1-4

NGSS.MS-PS2-5

Walker is testing which fertilizer will grow the tallest grass.  The height of the grown grass is the __ variable.

• constant (same)

• independent (changes)

• dependent (measured)

An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid: water, apple juice, or milk. What should be kept constant? 

• type of plant, flower pot,  soil, and amount of sunlight

• water, apple juice, milk

• only the amount of sunlight

• type of plant only

Tags

NGSS.MS-LS1-5

The factor that is deliberately changed or manipulated is

• A theory

• The dependent variable

• The data

• The independent variable

Tags

NGSS.MS-PS2-2

Which is the BEST description of biology?

• the study of humans and animals

• the study of life and living things in the natural environment

• the study of health care

• the study of humans, plants, and animals

Tags

NGSS.MS-LS1-4

NGSS.MS-LS2-1

A proposed explanation for an observation is

• a hypothesis

• an experiment

• a theory