GRE Subject Test: Biology : Understanding Types of Plants

Study concepts, example questions & explanations for GRE Subject Test: Biology

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Example Questions

Example Question #1 : Plantae

What is a distinct feature of a C4 plant?

Possible Answers:

Light independent reactions

Carbon fixation

Closed stomata during the day

Bundle-sheath cells

Correct answer:

Bundle-sheath cells

Explanation:

Carbon fixation converts inorganic carbon dioxide into organic carbon compounds, such as glucose and cellulose. This is a characteristic function of both C3 and C4, and is a primary purpose of light independent reactions.

Closed stomata during the day is a characteristic of CAM plants, which allows for the conservation of water that is usually lost during photorespiration.

Bundle-sheath cells are a characteristic of C4 plants. The presence of bundle-sheath cells isolates rubisco, preventing rubisco from binding to oxygen during photorespiration.

Example Question #1 : Understanding Photosynthesis, Light Reactions, And Calvin Cycle

Some organisms, such as green plants, are capable of obtaining energy directly from photosynthesis. These organisms are termed __________.

Possible Answers:

autotrophs

primary consumers

herbivores

heterotrophs

homotrophs

Correct answer:

autotrophs

Explanation:

Autotrophs are organisms that produce complex organic compounds from substances present in the surroundings. These organisms may do this through the use of energy from light or from inorganic chemical reactions.

In contrast, heterotrophs require organic input in order to generate biological compounds and are unable to use light or inorganic materials for energy.

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