Chapter 27: Seedless Plants

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27 Terms

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Antheridia
________ are gametangia that produce sperm cells, and archegonia are gametangia that produce eggs.
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Megaspores
________ give rise to female gametophytes that produce eggs.
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Meiosis
________ occurs within the capsule of the sporophyte to produce spores.
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Hornworts
________ (phylum Anthocerophyta) have thalloid gametophytes.
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Zygote
The ________ grows into an embryo that develops into a moss sporophyte, which is attached to the gametophyte.
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lobelike thalli
Many liverworts (phylum hepatophyta) have gametophytes that are flattened, ________; others are leafy.
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mature sporophyte plant
The ________ develops from the embryo and produces sporogenous cells (spore mother cells)
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Bryophytes
________ are the only plants with a dominant gametophyte generation.
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Fertilization
During ________, a sperm cell fuses with an egg cell in the archegonium.
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Mosses
________ (phylum Bryophyta) have gametophytes that are green plants that grow from a filamentous protonema.
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Ferns
________ and other vascular plants have xylem to conduct water and dissolved minerals and phloem to conduct dissolved sugar.
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Microspores
________ give rise to male gametophytes that produce sperm cells.
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Fern sporophytes
________ have roots, rhizomes, and leaves that are megaphylls.
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Sporophytes of club mosses
________ (phylum Lycopodiophyta) consist of roots, rhizomes, erect branches, and leaves that are microphylls.
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spore germinates
When a(n) ________, it grows into a protonema that forms buds that develop into gametophytes.
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Seedless vascular plants
________ have several adaptations that algae and bryophytes lack, including vascular tissues and a dominant sporophyte generation.
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Plants
________ probably arose from a group of green algae called charophytes.
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Sporophytes of whisk ferns
________ have dichotomously branching rhizomes and erect stems; they lack true roots and leaves.
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Horsetail sporophytes
________ have roots, rhizomes, aerial stems that are hollow and jointed, and leaves that are reduced megaphylls.
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evolution of heterospory
The ________ was an essential step in the evolution of seeds.
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colonization of land
The ________ by plants required the evolution of many anatomical, physiological, and reproductive adaptations.
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fern gametophyte
The ________, called a prothallus, develops from a haploid spore and bears both archegonia and antheridia.
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gametophyte plant
The ________ produces gametes by mitosis.
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zygote
The ________ develops into a multicellular embryo that the gametophyte protects and nourishes.
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Plants
________ have a waxy cuticle to protect against water loss and stomata for gas exchange needed for photosynthesis.
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Ferns
________ (phylum Pteridophyta) are the largest and most diverse group of seedless vascular plants.
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seedless vascular plants
As in bryophytes, reproduction in ________ depends on water as a transport medium for motile sperm cells.