IA 4th Grade MYF Science Review

The image here shows a grizzly bear consuming a salmon, which makes up a large part of its diet. If humans overfished in the area and removed a large number of salmon, what might happen to the grizzly population?

• The grizzly bear population would prey on humans for their food supply.

• The grizzly bear population would see an overall decrease without a main food supply.

• The grizzly population would see an overall increase due to greater availability of other food supplies.

• The grizzly population would see no change in population size due to a large variety of food types in their diet.

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A food web is shown in the diagram. Which statement BEST describes what will happen if the snake population decreases?

• The rabbit population will increase

• The hawk population will increase

• The Insect-Eating Bird will increase

• The shrew population will be eliminated

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Examine the model of a food chain in a meadow. Predict what would happen to the songbird population if the eagle population was overhunted by humans.

• The songbird population would increase due to lack of predators.

• The songbird population would stay the same size in this ecosystem.

• The songbird population would increase due to an increased food supply.

• The songbird population would decrease due to an increase of predators.

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A student is playing on a seesaw at the playground. Which part of the seesaw acts as the fulcrum (the point that supports the lever)?

• The seat where the student sits

• The middle part where the seesaw balances

• The ends of the seesaw

• The entire seesaw

Which of these best describes why a seesaw is considered a lever?

• It uses a wheel and axle to move up and down.

• It has a pulley that helps it lift objects.

• It uses a bar that pivots on a point to lift weight.

• It has a screw that holds it in place.

A student is pushing a heavy box up a ramp to load it into a truck. How does using the ramp (an inclined plane) make this task easier?

• It increases the weight of the box.

• It decreases the amount of force needed to lift the box by spreading the work over a longer distance.

• It makes the box move faster.

• It reduces the size of the box.

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Eyes are a very important organ to the body. As you look at yourself in the mirror, your eyes filter the amount of _______ that enters your eyes allowing you to see your own reflection. Without __________ you can not see the things around you.

(a)  

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When this dog is looking at itself in the mirror, light waves bounce back to its eyes and that is why it can see itself. What is another word for bounce?

• Lens

• Refract

• Reflect

• Shadow

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Which of the following best explains why a person’s face looks clear in a smooth, shiny surface like a mirror?

• The surface absorbs all the light from the person’s face.

• The surface reflects light from the person’s face directly back to their eyes.

• The surface allows light to pass through to the other side.

• The surface changes the color of the light from the person’s face.

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Which object below would reflect the most light?

• bird's feathers

• block of wood

• concrete driveway

• a sheet of metal

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