Unit 1: Biology Basics

Deja and Zhi conducted an experiment to test their hypothesis that male eggs of the American alligator only hatch at high temperatures. They conducted an experiment and their results were organized in the data table above. They concluded very high temperatures killed unhatched alligators. What comment(s) would you make to Deja and Zhi regarding their conclusions?

• A. Their conclusion is correct. Nothing should be added or deleted.

• B. They should reject their hypothesis. More males hatch at low temperatures, and more females hatch at high temperatures.

• C. They should accept their hypothesis, and also note that more eggs fail to hatch at high temperatures.

• D. They did not sample very many eggs, and no pattern is apparent in the data.

Tags

NGSS.HS-LS2-2

NGSS.HS-LS4-5

When writing a conclusion, what should you always refer back to?

• A. Procedure

• B. hypothesis

• C. your textbook

• D. the materials list

Leah, LaRenda, and Gabi decide to test what factors influence water absorption by an egg. They remove the shell from 3 eggs by dissolving them in vinegar. They create three different water solutions. One is pure, 100% distilled water, a second is 50% water/50% corn syrup, and the third is 100% corn syrup. The mass of each egg is measured before they are put into a single solution for 24 hours. The mass of the eggs is then measured, and the data recorded in the table:

In this experiment, the independent variable they are testing is:

• A. change in the mass of the eggs

• B. the ending mass of the eggs

• C. the amount of time they were in the solution

• D. the type of solution the egg is placed in

Tags

NGSS.MS-PS1-2

Leah, LaRenda, and Gabi decide to test what factors influence water absorption by an egg. They remove the shell from 3 eggs by dissolving them in vinegar. They create three different water solutions. One is pure, 100% distilled water, a second is 50% water/50% corn syrup, and the third is 100% corn syrup. The mass of each egg is measured before they are put into a single solution for 24 hours. The mass of the eggs is then measured, and the data recorded in the table:

This group also recorded a dependent variable, which is represented by:

• A. the change in mass of the eggs

• B. the ending mass of the eggs

• C. the amount of time they were in the solution

• D. the type of solution the egg is placed in

Tags

NGSS.MS-PS1-2

Leah, LaRenda, and Gabi decide to test what factors influence water absorption by an egg. They remove the shell from 3 eggs by dissolving them in vinegar. They create three different water solutions. One is pure, 100% distilled water, a second is 50% water/50% corn syrup, and the third is 100% corn syrup. The mass of each egg is measured before they are put into a single solution for 24 hours. The mass of the eggs is then measured, and the data recorded in the table:

Based on the data this group gathered, the most appropriate hypothesis would be:

• "If an egg is placed in corn syrup, then it will gain mass."

• "If an egg is placed in vinegar overnight, then its shell will dissolve."

• "If three eggs are each placed in three different solutions, then the egg in the distilled water will lose mass."

• "If an egg is placed in a pure water solution, then the egg will gain mass."

Tags

NGSS.HS-LS2-3

When designing an experiment, scientists will test a relationship between a "cause" and an "effect". The "effect", also represented by what the scientists measures and records, is known as the

• Dependent variable

• Constant

• Independent variable

• Control group

Ada and Elijah have decided to do an experiment testing how sunlight affects plant growth. The students choose the same type of plants, soil, pots and amount of water they give the plants. They also make sure each plant is put in their designated area for the same amount of time each day. One plant is placed outside; one in front of a window that only gets light for 1/2 the day, and one in a closet. The students collect data every day for two weeks. Their results show that the plant outside grew the most and the plant in the closet had the least amount of growth.

What are the constant variables that Ada and Elijah used in their experiment?

• Type of environment

• The amount of light

• Type of soil

• A and B

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

Make a qualitative observation, a quantitative observation, and an inference about the picture. (3 pts.)

Five students each used the same ruler to measure the length of the same pencil. Their measurements were: 15.33 cm, 15.34 cm, 15.33 cm, 15.33 cm, 15.34 cm. The actual length of the pencil was 15.85 cm. Explain whether the students' measurements were accurate, precise, or both? (3 pts.)

Write a hypothesis that is your prediction about the relationship between the following independent variable (IV) and dependent variable (DV)

IV - amount of caffeine DV - breathing rate of gold fish