Online Access Free GED-Science Exam Questions

A limiting factor is a condition in the environment that may prevent an increase in the size of the population.
Which condition is least likely to be a limiting factor?

• A.predators
• B.drought
• C.food supply
• D.disease
• E.wind

Susan is studying air pressure and makes a simple mercury barometer as shown below. She knows that air exerts pressure. More pressure on the surface of the mercury in the bowl will cause the mercury level to rise. Less pressure will cause the mercury to fall. High barometric pressure is often associated with fair weather, and low barometric pressure is associated with rain.
Susan is enjoying a bright, sunny day when she hears a local weather forecaster predict rain for tomorrow.

When Susan checks her barometer tomorrow, which change is she most likely to note?

• A.totally fill the tube
• B.remain unchanged
• C.have risen by about 5%
• D.have fallen
• E.have risen by more than 10%

Two students are testing the effect of light intensity on photosynthesis. They place a green aquarium plant inside a clear glass container of pond water and turn on a floodlight located three feet away. Bubbles of oxygen soon come from the plant. Then, the students move the floodlight a foot closer to the glass and leave it for ten minutes.
Exhibit: Which of the following statements represents the BEST prediction about the aquarium and its contents?

• A.The bubbles decrease in size.
• B.The plant is floating on the surface of the water.
• C.The bubbles come from the lower parts of the plants.
• D.The rate of bubbling increases.
• E.The bubbles come from the upper parts of the plants.

A single organism of diatoms is rarely seen by the average person. Which statement would justify that conclusion?

• A.Diatoms are found only in very deep waters.
• B.Most people do not live near marine environments.
• C.The lifestyles of diatoms are very complex.
• D.Diatoms are free-floating, so they travel too quickly.
• E.Diatoms can be seen only with a microscope.

The Perfect Food Company makes Energy Bars for use as a meal replacement or diet supplement.

A Perfect Food Company spokesperson claims that Perfect's Energy Bar is superior to other nutritional bars.
Which explanation is most likely based on opinion rather than fact?

• A.contain 40% protein
• B.are chocolate-covered
• C.have 225 calories
• D.taste better
• E.are fat free