science review

Which statement describes the difference between the two types of variables?

.

• The outcome variable does not change and the test variable does change.

• The outcome variable is the control and the test variable is the result.

• The test variable does change and the outcome variable is measured.

• The test variable does not change and the outcome variable does not change.

A scientist claims that frog populations are disappearing worldwide. How could another scientist go about collecting data to support this?

• Observe frogs in a lab

• Gather the opinions of other scientists

• Make quantitative observations in the frog's environment

• Data cannot be collected in this circumstance

Four bean seeds are placed in each of four pots. Each pot contains 100 cubic centimeters (cm³) of soil. All four pots are placed on the same sunny windowsill. Different amounts of water are placed in each pot. What would be the outcome (dependent) variable in this experiment?

• Amount of sunlight

• Size of pots

• Growth of seeds

• Amount of water added

Scientists today agree on many ideas about how the natural world works. Which of the following is a scientific attitude towards these ideas?

• Some of the scientific ideas may change when scientists have more information.

• Most scientific ideas will not be changed for a very long time to come.

• Scientists use opinions and empirical evidence to gather valid data.

• Society insists that science has to change to keep up with fast moving world events.

Complete the following sentence so that it is correct: Scientific theories are based on ____.

• general assumptions of how systems work.

• large amounts of data collected over time.

• observations from within only one scientific discipline.

• mathematical principles that can be proven true.

Which describes how scientific knowledge is reviewed and accepted?

• Most scientists work alone to protect their patent on their work

• Most scientific knowledge is accepted right away by other scientists

• They work in collaboration, share ideas, debate and confirm ideas

• none

In 1953, Norman Larsen, founder of The Chemical Rocket Company, was determined to develop a water displacement formula that would prevent rust. On the 40th attempt of his experiment, the formula was perfected and named WD-40. Today, WD-40 is still used as a rust-prevention solvent.

WD-40 is an example of a discovery made by ___.

• accident.

• guessing.

• scientific experimentation.

• literary research.

Which of the following is a way to gather empirical evidence about plants?

• conduct research on the internet and textbooks

• make observations during an experiment

• gather opinions from classmates, teachers, and scientistss

• read reports about other experiments that are similar to your experiments

Biologists study living things, including objects that can be as small as a cell. Jane Goodall wants to study the eating habits of chimpanzees in the jungle. What method would be best for her investigation?

• design an experiment to test different types of food on chimpanzees

• research different native plant species in the jungle

• observe chimpanzees in their natural habitat

• make a model of chimpanzees eating

A scientist at a respected research laboratory reports a startling new discovery. Her conclusions are based on data from many trials. However, other scientists are unable to reproduce the results of the experiment. Which statement best describes this situation?The results are announced to the public.

• The results are announced to the public.

• The experiment does no include sophisticated equipment.

• The conclusions are based on multiple trials.

• The experimental results cannot be replicated.