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GED Test Science Q&A

Question 1 of 38

Some scientists advocate for the use of alternative fuel, such as biofuels, in vehicles. These fuels are often made from natural materials such as corn or algae. Although many of these biofuels are still in the developmental stage, scientists believe they will be able to perform similarly to fossil fuels. Some biofuels, such as ethanol, are already in use and are able to propel certain vehicle types. One of the main reasons scientists support biofuel research is that these fuels are easier to replenish than fossil fuels. The process of fossilization of animals and plants takes longer, while biofuels can be made by faster-growing organisms, such as corn or algae.

Which piece of evidence from the passage supports the hypothesis that biofuel emissions are renewable and fossil fuels are not?

• “Some biofuels, such as ethanol, are already in use and are able to propel certain vehicle types.”
• “The process of fossilization of animals and plants takes longer, while biofuels can be made by faster-growing organisms, such as corn or algae.” (Correct Answer)
• “Although many of these biofuels are still in the developmental stage, scientists believe they will be able to perform similarly to fossil fuels.”
• “These fuels are often made from natural materials such as corn or algae.

GED® Test – Science

Question 6 of 38

Photosynthesis is the basic process used by most plants to produce the energy they need to live. The process can be summarized as an endothermic reduction reaction:

1. Water is oxidized using energy from a light source to split it into oxygen and hydrogen ions.
2. The hydrogen ions reduce carbon dioxide, decreasing the oxidation state of the carbon dioxide so that the hydrogen and carbon dioxide combine. This produces simple sugar.

In the context of this process, “reduction reaction” refers to a reaction that does what?

• makes the reactants smaller
• lowers the oxidation state of one or more reactants (Correct Answer)
• makes the molecular reactants simpler
• lessens the amount of the reactants

GED Test Science Q&A