Evidence Supporting Ideas

Question 1

Jordan claims that heating a rubber band before stretching makes it stretch a greater distance than a rubber band kept at room temperature. Which of the following statements is the best piece of scientific evidence that supports Jordan’s claim?

Accepted Answer

In an experiment, Jordan stretched a rubber band that had been placed in a 40 °C water bath and measured it stretched 12 cm. He then stretched the same type of rubber band at 20 °C and measured 9 cm. He repeated this trial three times and got an average stretch of 12 cm for the warm band and 9 cm for the cool band.

Answer

Jordan says that a warm rubber band stretches farther because heat makes the rubber molecules move more.

Answer

Jordan’s friend noticed that when he played with a warm rubber band, it seemed longer than when it was cold.

Answer

The teacher told the class that heated rubber becomes softer, so it should stretch more.

Question 2

A student is testing how the colour of light influences the height of bean plants. She grows three groups of plants: one under blue light, one under red light, and one in normal sunlight. After two weeks she records these observations: - Plants under blue light are, on average, 5 cm taller than the plants under red light. - The gardener says the plants look greener under blue light. - Plants under blue light have more leaves than the plants under red light. - The greenhouse temperature was 2 °C higher when the blue lights were on. Which observation provides the strongest scientific evidence that blue light helps the plants grow taller?

Accepted Answer

Plants under blue light are, on average, 5 cm taller than the plants under red light.

Answer

Plants under blue light have more leaves than the plants under red light.

Answer

The greenhouse temperature was 2 °C higher when the blue lights were on.

Answer

The gardener says the plants look greener under blue light.

Question 3

Which of the following statements provides the strongest scientific evidence that sunlight helps plants grow?

Accepted Answer

A plant grown in a dark room grew very little compared to a plant grown in a sunny window.

Answer

A student observed that a leaf was wilting on a plant.

Answer

The teacher said that plants need sunlight to grow.

Answer

All the plants in the classroom are green.

Try three questions

Jordan claims that heating a rubber band before stretching makes it stretch a greater distance than a rubber band kept at room temperature. Which of the following statements is the best piece of scientific evidence that supports Jordan’s claim?

Which of the following statements provides the strongest scientific evidence that sunlight helps plants grow?

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