4th grade Science- Unit 1

Jamal plans an investigation to test the strength of a packing foam material. He finds that the material gets a dent when he puts more than three bricks on it. What inference can he make?

• The foam is very strong.

• The bricks are too heavy for the test.

• The foam will dent if he places six bricks on it.

• The foam will lay flat if he places five blocks of wood on it.

Which tool could you use to collect information on how much time it takes for the dye to be absorbed by a stalk of celery placed in a glass of red dye?

• clock

• hand lens

• calculator

• Celsius thermometer

Reva wanted to determine if watering plants makes a difference in their growth. During her investigation, she watered only one of two plants. After a few days, she noticed that the plants looked different. How did she collect data?

• by predicting

• by observing

• by measuring

• by communicating

Millions of honeybees have vanished from their hives throughout the country recently. Scientists have suggested several possible explanations, but no one is certain why this is happening. What do bee experts need to do to evaluate the different explanations?

• talk about one of the explanations for a long time

• examine all sides of the evidence presented by the scientists

• decide to study the problem further after discarding one of the ideas

• pick the best idea and apply it to the problem of a reduced bee population

Sarah is taking part in an experiment on how quickly mold forms on bread. Which of these tools can she use to record the information she has collected?

• Calculator

• Ruler

• Temerature

• Notebook

Hiroto wonders about the changes that take place as a tadpole grows into a frog. What type of model would be most useful for representing how tadpoles change into frogs in the natural world?

• plastic models of two different types of frogs

• a computer animation of the life cycle of a frog

• a diagram that shows the different parts of a frog’s body

• photographs of a tadpole and a fully grown frog

Lukas wants to make a model of the river shown below. What is one limitation the model will have in representing the natural world?

• It will not be able to show the forest.

• It will not be able to show the shoreline.

• It will not be able to show people using the river.

• It will not be able to show the actual size of the river.

Scientists use different models depending on the subject they are studying. What is true about all models that represent the natural world?

• They help humans understand nature.

• They represent one object in nature at a time.

• They are the same size as the objects in nature.

• They include every detail of the objects that are in nature.

Ida wants to build a 3-D model based on a complete fossil of an extinct bird. What is one limitation in accuracy that she will face as she works to represent the natural world of the bird?

• representing the size of the bird

• representing the shape of the bird

• representing the colors of the bird

• representing the bones of the bird

Dr. Omar wants to use the metric system to collect data on the boy’s illness. What unit of measure should he use to record the boy’s temperature?

• grams

• degrees Celsius

• degrees Fahrenheit

• centimeters