Understanding Alternation of Generations - GRE Subject Test: Biology
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The __________ generation is dominant in the bryophyte life cycles, and the __________ generation is dominant in seedless vascular plants.
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The __________ generation is dominant in the bryophyte life cycles, and the __________ generation is dominant in seedless vascular plants.
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.
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.
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Which of the following refers to the principle of alternation of generations in plants?
Which of the following refers to the principle of alternation of generations in plants?
Plants have a multicellular haploid stage called the gametophyte. Gametophytes (
) produce gametes (
) through mitosis, which combine to produce a zygote (
). The zygote grows into a multicellular, diploid sporophyte (
), which produces spores (
) through meiosis. Those spores give rise to multicellular gametophytes.
Plants have a multicellular haploid stage called the gametophyte. Gametophytes (
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Which of the following structures would be found in a tracheophyte, but not in a bryophyte?
Which of the following structures would be found in a tracheophyte, but not in a bryophyte?
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.
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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