GRE Subject Test: Biology : Plantae
Study concepts, example questions & explanations for GRE Subject Test: Biology
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Example Questions
Example Question #802 :Ap Biology
What is a distinct feature of a C4plant?
Closed stomata during the day
Light independent reactions
Carbon fixation
Bundle-sheath cells
Bundle-sheath cells
Carbon fixation converts inorganic carbon dioxide into organic carbon compounds, such as glucose and cellulose. This is a characteristic function of both C3and C4,是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 C4plants. The presence of bundle-sheath cells isolates rubisco, preventing rubisco from binding to oxygen during photorespiration.
Example Question #1 :Understand Inputs And Outputs, Purpose
Some organisms, such as green plants, are capable of obtaining energy directly from photosynthesis. These organisms are termed__________.
autotrophs
herbivores
heterotrophs
homotrophs
primary consumers
autotrophs
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.
Example Question #1 :Plant Biology
Which of the following refers to the principle of alternation of generations in plants?
A life cycle which includes a unicellular haploid stage
The differences between a tree and a seed
The need for external pollinators
A life cycle that includes a multicellular haploid stage
Gamete-producing sporophytes
A life cycle that includes a multicellular haploid stage
Plants have a multicellular haploid stage called the gametophyte. Gametophytes (
Example Question #1 :Understanding Vascular And Avascular Plants
Fill in the blanks.
The__________generation is dominant in the bryophyte life cycles, and the__________generation is dominant in seedless vascular plants.
gametophyte . . . gametophyte
sporophyte . . . sporophyte
gametophyte . . . sporophyte
sporophyte . . . gametophyte
gametophyte . . . sporophyte
Bryophytes are nonvascular plants, such as mosses. Gametophytes are species that have haploid cells during their mature lives, while sporophytes are predominantly diploid during their adult phases.
Bryophytes have the gametophyte generation as dominant, with the sporophytes relying on the parental gametophyte. Starting with the evolution of seedless vascular plants, the gametophytes become reduced and are no longer the dominant life cycle. By the formation of angiosperms (seed plants), the gametophytes have become dependent on the parental sporophyte.
Example Question #1 :Plant Biology
下面哪个结构会发现我n a tracheophyte, but not in a bryophyte?
Cell walls
Plasmids
Chloroplasts
Xylem
Xylem
All plants can be classified as either bryophytes or tracheophytes. Plants that contain transport vessels (xylem and phloem) are tracheophytes, while those without transport vessels are bryophytes. All plants contain cell walls and chloroplasts, but only a tracheophyte would contain xylem. Plasmids are structures that are almost exclusively found in bacteria or protozoans.
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