Anonymous asked in Science & MathematicsBotany · 1 decade ago

2 unique characteristics of seedless vascular plants, gymnosprems, and angiosprems?


what is the evolutionary timeline of these?

6 Answers

  • Anonymous
    1 decade ago
    Best answer

    seedless vascular plants are pteridophytes xylem, trachea are absent and in phloem companion cells are absent

    2. fertilisation is essentially by agency of water ie zooidogamy

    eg:Plisitum, Selaginella

    gymnosperms: 1. coralloid roots beside normal root system

    2. there is a combination of zooidogamy and siphonogamy

    eg: Pinus, Cycas

    angiosperms: 1.seeds are enclosed in fruits.

    2. fertilisation involves siphonogamy.

    eg: Ranunculus, Anemone

    you can find many more such uniqye characters in a good botany textbook

    as far as evolution is considered i agree with the above answer

  • 3 years ago

    Seedless Vascular Plants Characteristics

  • 3 years ago

    Characteristics Of Seedless Vascular Plants

  • Anonymous
    1 decade ago

    A) SEEDLESS VASCULAR PLANTS---( The Pteridophytes )

    Unique characters -- 1) These are the only plants that are seedless & Vascular at the sams time . You cannot use that expression for any other group.

    2) This is the only group in which the sporophyte and the gametophyte are independent of each other.

    B ) GYMNOSPERMS - Unique characters-

    1 ) They bear seeds but no fruits

    2) Xylem elements show bordered pits .

    C) ANGIOSPERMS - Unique characters--

    1) These are the seed as well as fruit bearing plants.

    2 ) They show double fertilization .

    The pteridophytes appeared first ; then the gymnosperms

    and lastly the angiosperms.

    I) Ferns first appear in the fossil record in the early-Carboniferous period. By the Triassic, the first evidence of ferns related to several modern families appeared. The "great fern radiation" occurred in the late-Cretaceous, when many modern families of ferns first appeared.

    I I ) Gymnosprms ( Cycads ) The cycad fossil record dates to the Early Permian, 280 million years ago .

    I I I ) Angiosperms --The Cenozoic is the age of new life. During the Cenozoic, flowering plants seems to have appeared.

    Source(s): Botanist
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  • Anonymous
    4 years ago

    This Site Might Help You.


    2 unique characteristics of seedless vascular plants, gymnosprems, and angiosprems?


    what is the evolutionary timeline of these?

    Source(s): 2 unique characteristics seedless vascular plants gymnosprems angiosprems:
  • Anonymous
    1 decade ago

    examples of seedless vascular plants (aka nonseed tracheophytes) are club mosses, whisk ferns, horsetails, and ferns

    gymnosperms: conifers, ginkgos, cycads

    angiosperms: any flowering plant

    i don't know if they're unique characteristics but...

    seedless vascular plants: independent gametophyte and sporophyte generations, first group to have tracheids

    gymnosperms: seed plants that don't form flowers, no ovaries, some bear cones

    angiosperms: flowers, fruits, double fertilization

    seedless vascular plants came about 409-354 mya, gymnosperms came next, angiosperms last (140 mya)

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