Plant Evolution and Characteristics Quiz
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Questions and Answers

What is the estimated time frame for when the common ancestor of modern charophytes and land plants existed?

  • 350mya
  • 250mya
  • 450mya (correct)
  • 500mya
  • What is the name given to the durable polymer that prevents exposed zygotes from drying out in charophytes?

  • Cellulose
  • Sporopollenin (correct)
  • Sporellenin
  • Chitin
  • What is the estimated number of living plant species today?

  • 200,000
  • 400,000
  • 100,000
  • 300,000 (correct)
  • Which of the following is NOT a derived trait of plants?

    <p>Flagellated sperm (C)</p> Signup and view all the answers

    What is the primary reason land plants evolved from green algae called charophytes?

    <p>Access to sunlight (A)</p> Signup and view all the answers

    What is the primary reason that land plants are referred to as 'embryophytes'?

    <p>They have a multicellular, dependent embryo. (B)</p> Signup and view all the answers

    Which of the following is NOT a challenge that early plants faced when transitioning to land?

    <p>Abundant herbivores. (C)</p> Signup and view all the answers

    What is the function of sporopollenin in plant spores?

    <p>To protect spores from harsh environments. (C)</p> Signup and view all the answers

    In the alternation of generations, what process produces haploid spores?

    <p>Meiosis in the sporophyte. (D)</p> Signup and view all the answers

    What is the role of placental transfer cells in plant reproduction?

    <p>They help transport nutrients from the parent plant to the developing embryo. (C)</p> Signup and view all the answers

    Which of the following is a trait shared by nearly all land plants (embryophytes) but absent in charophytes?

    <p>Multicellular gametangia. (B)</p> Signup and view all the answers

    The term 'gametophyte' refers to which stage in the alternation of generations?

    <p>The haploid stage that produces gametes. (D)</p> Signup and view all the answers

    What is the significance of the 'cuticle' in land plants?

    <p>It helps prevent water loss from the plant. (D)</p> Signup and view all the answers

    What is the name of the structure that produces pollen grains?

    <p>Staminate cone (C)</p> Signup and view all the answers

    Which of these is NOT a phylum of gymnosperms?

    <p>Anthophyta (C)</p> Signup and view all the answers

    What advantage did gymnosperms have over nonvascular plants in drier conditions?

    <p>All of the above (D)</p> Signup and view all the answers

    Which of these groups dominated the terrestrial ecosystem during the Mesozoic era?

    <p>Gymnosperms (D)</p> Signup and view all the answers

    What is the significance of the “naked” seeds of gymnosperms?

    <p>They are not enclosed by ovaries (A)</p> Signup and view all the answers

    Which of the following is a characteristic of cycads?

    <p>Palm-like leaves (A)</p> Signup and view all the answers

    What does the term “gametophyte” refer to?

    <p>The haploid generation that produces gametes (B)</p> Signup and view all the answers

    How long does it take for a pine cone to produce mature seeds?

    <p>3 years (D)</p> Signup and view all the answers

    Which phylum contains the genera that vary from tropical to desert species?

    <p>Phylum Gnetophyta (C)</p> Signup and view all the answers

    What reproductive structures do angiosperms possess?

    <p>Fruits and flowers (C)</p> Signup and view all the answers

    What term is used to describe the transfer of pollen from one flower's anther to another flower's stigma?

    <p>Pollination (C)</p> Signup and view all the answers

    Which phylum is the largest among gymnosperms?

    <p>Phylum Coniferophyta (C)</p> Signup and view all the answers

    What does the term 'angiosperm' mean?

    <p>Seeds in containers (A)</p> Signup and view all the answers

    What do seeds consist of?

    <p>An embryo and nutrients surrounded by a protective coat (D)</p> Signup and view all the answers

    Which pollinators are known to aid in the pollination process?

    <p>Wind, water, and lizards (D)</p> Signup and view all the answers

    Which of the following is a characteristic of eudicots?

    <p>Diverse reproductive structures (D)</p> Signup and view all the answers

    Approximately when did seeds first appear in the evolutionary timeline?

    <p>360 million years ago (C)</p> Signup and view all the answers

    What is the primary reproductive advantage of seeds over spores?

    <p>Seeds can remain dormant until conditions are favorable (D)</p> Signup and view all the answers

    What is the primary feature that distinguishes conifers from other plant groups?

    <p>They predominantly retain their leaves year-round (A)</p> Signup and view all the answers

    Which of the following represents a trait common to all seed plants?

    <p>Pollen and ovules (C)</p> Signup and view all the answers

    What are microsporangia responsible for producing?

    <p>Microspores that develop into male gametophytes (B)</p> Signup and view all the answers

    What adaptation allows seed plants to pollinate without needing water?

    <p>Pollen grains (C)</p> Signup and view all the answers

    What is the result of fertilization in seeds?

    <p>An ovule developing into a sporophyte embryo (D)</p> Signup and view all the answers

    What characteristic distinguishes seed plants from their ancestors?

    <p>Presence of ovules and pollen (B)</p> Signup and view all the answers

    What characteristic distinguishes living vascular plants from bryophytes?

    <p>Presence of xylem and phloem (D)</p> Signup and view all the answers

    Which of the following statements is true about the life cycle of seedless vascular plants?

    <p>Sporophytes are the larger generation (D)</p> Signup and view all the answers

    Which phylum includes ferns and horsetails?

    <p>Phylum Pterophyta (C)</p> Signup and view all the answers

    What role did ancient Lycophytes and Pterophytes play during the Carboniferous period?

    <p>They formed the first forests (A)</p> Signup and view all the answers

    Which aspect of ferns is notable regarding their species diversity?

    <p>They boast more than 12,000 species (D)</p> Signup and view all the answers

    What is a characteristic feature of horsetails today?

    <p>They primarily include the genus Equisetum (D)</p> Signup and view all the answers

    How may increased photosynthesis from ancient forests have affected the climate at the end of the Carboniferous period?

    <p>It is believed to have caused global cooling (D)</p> Signup and view all the answers

    What type of sperm do seed plants lose that is present in vascular plants?

    <p>Flagellated sperm (C)</p> Signup and view all the answers

    Flashcards

    Embryophyte

    Plants that exhibit embryonic development; includes land plants.

    Charophytes

    A group of green algae closely related to land plants; share a common ancestor with them.

    Sporopollenin

    A durable polymer that protects zygotes from drying out in charophytes.

    Plant evolution

    The process by which plants diversified from ancestral forms to current species, adapting to land.

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    Gymnosperms vs Angiosperms

    Gymnosperms are seed plants with naked seeds; Angiosperms are flowering plants with seeds in fruits.

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    Vascular Plants

    Plants with specialized tissues (xylem and phloem) for nutrient transport.

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    Sporophyte

    The dominant generation in vascular plants; larger than gametophyte.

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    Gametophyte

    The smaller generation in vascular plants, growing on or below the soil surface.

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    Phylum Lycophyta

    Includes club mosses, spike mosses, and quillworts; ancient vascular plant group.

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    Phylum Pterophyta

    Includes ferns, horsetails, and whisk ferns; most diverse seedless vascular plants.

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    Carboniferous Period

    Time when ancient vascular plants formed the first forests and influenced climate.

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    Horsetails

    Critical genus Equisetum, characterized by jointed stems; less diverse now.

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    Whisk Ferns

    Resemble ancestral plants but are closely related to modern ferns.

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    Seed Evolution

    Seeds emerged around 360 million years ago, influencing plant dominance.

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    Components of a Seed

    A seed consists of an embryo, nutrients, and a protective coat.

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    Key Adaptations for Land

    Seeds and pollen grains are vital for terrestrial life.

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    Heterospory

    Heterospory is the production of two types of spores: microspores and megaspores.

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    Megasporangia Function

    Megasporangia produce megaspores that develop into female gametophytes.

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    Microsporangia Function

    Microsporangia produce microspores that become male gametophytes (pollen).

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    Pollination Process

    Pollination transfers pollen to ovules via air or animals without needing water.

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    Advantages of Seeds

    Seeds offer dormancy and can be transported long distances, enhancing survival.

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    Gymnosperms

    Seed plants that bear 'naked' seeds, not enclosed by ovaries.

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    Phyla of Gymnosperms

    Four main phyla: Cycadophyta, Ginkgophyta, Gnetophyta, Coniferophyta.

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    Cycadophyta

    Phylum of gymnosperms with large cones and palm-like leaves, few species today.

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    Ginkgophyta

    Phylum with a single living species, Ginkgo biloba, known for its unique fan-shaped leaves.

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    Coniferophyta

    Phylum that includes conifers like pine, fir, and redwood with needle-like leaves and cones.

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    Pollination in Gymnosperms

    Gymnosperms use pollen for reproduction, adapting to dry conditions.

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    Cone Structure

    Staminate cones produce pollen grains; larger cones contain ovules that develop into seeds.

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    Life Cycle of Pine

    Takes nearly 3 years from cone production to mature seed in pine trees.

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    Alternation of generations

    A reproductive cycle where plants alternate between diploid sporophyte and haploid gametophyte.

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    Sporangia

    Organs in the sporophyte that produce haploid spores through meiosis.

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    Walled spores

    Spores enclosed in protective walls made with sporopollenin for harsh environments.

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    Gametangia

    Organs where gametes are produced in plants.

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    Placental transfer cells

    Cells that transfer nutrients from the parent to the embryo.

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    Sporocytes

    Diploid cells in sporangia that undergo meiosis to form haploid spores.

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    Mycorrhizae

    Mutualistic associations between fungi and plant roots, aiding in nutrient absorption.

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    Phylum Gnetophyta

    A phylum consisting of three genera, with species varying from tropical to desert environments.

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    Angiosperms

    Seed plants with flowers and fruits, most diverse group of plants, classified under Anthophyta.

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    Pollination

    The transfer of pollen from an anther to a stigma, can occur via various agents.

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    Monocots

    A group of angiosperms characterized by having one seed leaf and parallel leaf veins.

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    Eudicots

    A major group of angiosperms with two seed leaves and net-like leaf veins.

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    Anthophyta

    The single phylum classification for all angiosperms; derived from the Greek for 'flower'.

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    Agents of Pollination

    Organisms that assist in pollination processes, such as insects, birds, and mammals.

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    Study Notes

    Plant Evolution and Characteristics

    • Plants evolved from green algae, specifically charophytes
    • The terrestrial surface was lifeless for 3 billion years
    • Plants have diversified into roughly 300,000 living species
    • Plants are the primary producers in most terrestrial ecosystems
    • Plants supply oxygen and are the ultimate food source for land animals

    Derived Traits of Plants

    • Embryophytes have four key traits absent in charophytes: -Alternation of generations (with multicellular, dependent embryos) -Walled spores produced in sporangia -Multicellular gametangia -Apical meristems
    • Many plants have cuticles and mycorrhizae

    Alternation of Generations

    • Plants alternate between two multicellular stages:
      • Sporophyte (diploid)
      • Gametophyte (haploid)
    • The gametophyte produces haploid gametes by mitosis
    • Fusion of the gametes produces the diploid sporophyte
    • The sporophyte produces haploid spores by meiosis

    Walled Spores Produced in Sporangia

    • Sporophytes produce spores in organs called sporangia
    • Diploid cells called sporocytes undergo meiosis to produce haploid spores
    • Spore walls contain sporopollenin, making spores resistant to harsh environments

    Multicellular Gametangia

    • Gametes are produced within organs called gametangia
    • Female gametangia (archegonia) produce eggs and are the site of fertilization
    • Male gametangia (antheridia) produce sperm

    Apical Meristems

    • Plants sustain continual growth in apical meristems (shoot and root tips)
    • Cells from apical meristems differentiate into various tissues

    Nonvascular Plants

    • Bryophytes are represented by three phyla of small, herbaceous plants: -Liverworts (phylum Hepatophyta) -Hornworts (phylum Anthocerotophyta) -Mosses (phylum Bryophyta)
    • Mosses are closely related to vascular plants
    • These plants are dominant over a haploid/gametophyte stage throughout their life cycle

    Vascular Plants

    • Fossils of vascular plants date back about 420 million years
    • Early vascular plants had independent, branching sporophytes
    • Living vascular plants are characterized by: -Dominant sporophytes -Vascular tissues (xylem and phloem) -Well-developed roots to absorb nutrients and leaves for photosynthesis
    • Two phyla of seedless vascular plants: -Lycophytes (e.g., club mosses, spike mosses, quillworts) -Pterophytes (e.g., ferns, horsetails, whisk ferns)
    • These plants thrived at great heights during the Carboniferous period

    Significance of Seedless Vascular Plants

    • Ancient lycophytes and pterophytes proliferated and formed the first forests during the Devonian and Carboniferous periods
    • Increased photosynthesis may have helped produce the global cooling at the end of the Carboniferous period
    • Decaying plants from these Carboniferous forests became coal

    Seed Plants

    • Seeds changed the course of plant evolution, enabling them to become dominant producers
    • A seed consists of an embryo and nutrients surrounded by a protective coat
    • Seeds came about 360 million years before gymnosperms and 200 million years before angiosperms

    Seeds and Pollen Grains

    • In addition to seeds, all seed plants share the following derived traits: -Reduced gametophytes -Heterospory (male and female spores) -Ovules -Pollen
    • The gametophytes of seed plants develop within the parent sporophyte's tissues

    Gymnosperms

    • These seed plants have "naked" seeds not enclosed by ovaries
    • Gymnosperms appeared early in the fossil record and dominated Mesozoic ecosystems
    • Gymnosperms are better suited to drier conditions than nonvascular plants
    • Four phyla: -Cycadophyta (cycads) -Ginkgophyta (Ginkgo biloba) -Gnetophyta (Gnetum, Ephedra, Welwitschia) -Coniferophyta (conifers such as pine, fir, and redwood

    Angiosperms

    • Angiosperms came on the scene 130-150 million years ago
    • Angiosperms are seed plants with reproductive structures called flowers and fruits
    • They are the most widespread and diverse plants
    • Two major groups: monocots and eudicots

    Characteristics of Angiosperms

    • All angiosperms are classified in the single phylum Anthophyta, derived from the Greek word for "flower"
    • Angiosperms have specialized features for successful reproduction, such as flowers, double fertilization, fruits, and pollen

    Pollination

    • Pollination is the transfer of pollen from an anther to a stigma
    • Pollination can occur via wind, water, animals (e.g., bees, moths, butterflies, birds, lizards, or bats)

    Angiosperm Life Cycle

    • Angiosperms undergo a life cycle featuring a prominent sporophyte generation
    • Their life cycle includes the flower, double fertilization, and fruit formation

    Fruit Form and Function

    • A fruit develops from the ovary
    • It protects enclosed seeds and aids in seed dispersal by wind or animals
    • Fruits may be classified as dry or fleshy

    Fruit Dispersal

    • Fruit dispersal mechanisms include wind, water, and animals

    Reproduction of Plants

    • Plants can reproduce sexually or asexually, or both
    • Sexual reproduction results in genetically different offspring
    • Asexual reproduction results in clones of genetically identical organisms
    • Mechanisms of asexual reproduction include fragmentation, rhizomes, and adventitious shoots

    Asexual vs. Sexual Reproduction

    • Asexual reproduction is beneficial in stable environments, but clones are vulnerable to extinction in changing environments.
    • Sexual reproduction generates genetic variation, important for environmental changes

    Additional Notes

    • Pando (a clonal aspen grove) is a remarkable example of asexual reproduction
    • Some gymnosperms/angiosperms have unique adaptations for reproduction, including specific types of flowers, fruits, and pollination methods

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    Test your knowledge on plant evolution and their unique characteristics. This quiz covers the transition from green algae to land plants and explores key traits such as alternation of generations, walled spores, and more. Perfect for students of botany and plant biology.

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