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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?
What is the estimated time frame for when the common ancestor of modern charophytes and land plants existed?
What is the name given to the durable polymer that prevents exposed zygotes from drying out in charophytes?
What is the name given to the durable polymer that prevents exposed zygotes from drying out in charophytes?
What is the estimated number of living plant species today?
What is the estimated number of living plant species today?
Which of the following is NOT a derived trait of plants?
Which of the following is NOT a derived trait of plants?
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What is the primary reason land plants evolved from green algae called charophytes?
What is the primary reason land plants evolved from green algae called charophytes?
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What is the primary reason that land plants are referred to as 'embryophytes'?
What is the primary reason that land plants are referred to as 'embryophytes'?
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Which of the following is NOT a challenge that early plants faced when transitioning to land?
Which of the following is NOT a challenge that early plants faced when transitioning to land?
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What is the function of sporopollenin in plant spores?
What is the function of sporopollenin in plant spores?
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In the alternation of generations, what process produces haploid spores?
In the alternation of generations, what process produces haploid spores?
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What is the role of placental transfer cells in plant reproduction?
What is the role of placental transfer cells in plant reproduction?
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Which of the following is a trait shared by nearly all land plants (embryophytes) but absent in charophytes?
Which of the following is a trait shared by nearly all land plants (embryophytes) but absent in charophytes?
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The term 'gametophyte' refers to which stage in the alternation of generations?
The term 'gametophyte' refers to which stage in the alternation of generations?
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What is the significance of the 'cuticle' in land plants?
What is the significance of the 'cuticle' in land plants?
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What is the name of the structure that produces pollen grains?
What is the name of the structure that produces pollen grains?
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Which of these is NOT a phylum of gymnosperms?
Which of these is NOT a phylum of gymnosperms?
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What advantage did gymnosperms have over nonvascular plants in drier conditions?
What advantage did gymnosperms have over nonvascular plants in drier conditions?
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Which of these groups dominated the terrestrial ecosystem during the Mesozoic era?
Which of these groups dominated the terrestrial ecosystem during the Mesozoic era?
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What is the significance of the “naked” seeds of gymnosperms?
What is the significance of the “naked” seeds of gymnosperms?
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Which of the following is a characteristic of cycads?
Which of the following is a characteristic of cycads?
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What does the term “gametophyte” refer to?
What does the term “gametophyte” refer to?
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How long does it take for a pine cone to produce mature seeds?
How long does it take for a pine cone to produce mature seeds?
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Which phylum contains the genera that vary from tropical to desert species?
Which phylum contains the genera that vary from tropical to desert species?
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What reproductive structures do angiosperms possess?
What reproductive structures do angiosperms possess?
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What term is used to describe the transfer of pollen from one flower's anther to another flower's stigma?
What term is used to describe the transfer of pollen from one flower's anther to another flower's stigma?
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Which phylum is the largest among gymnosperms?
Which phylum is the largest among gymnosperms?
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What does the term 'angiosperm' mean?
What does the term 'angiosperm' mean?
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What do seeds consist of?
What do seeds consist of?
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Which pollinators are known to aid in the pollination process?
Which pollinators are known to aid in the pollination process?
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Which of the following is a characteristic of eudicots?
Which of the following is a characteristic of eudicots?
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Approximately when did seeds first appear in the evolutionary timeline?
Approximately when did seeds first appear in the evolutionary timeline?
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What is the primary reproductive advantage of seeds over spores?
What is the primary reproductive advantage of seeds over spores?
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What is the primary feature that distinguishes conifers from other plant groups?
What is the primary feature that distinguishes conifers from other plant groups?
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Which of the following represents a trait common to all seed plants?
Which of the following represents a trait common to all seed plants?
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What are microsporangia responsible for producing?
What are microsporangia responsible for producing?
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What adaptation allows seed plants to pollinate without needing water?
What adaptation allows seed plants to pollinate without needing water?
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What is the result of fertilization in seeds?
What is the result of fertilization in seeds?
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What characteristic distinguishes seed plants from their ancestors?
What characteristic distinguishes seed plants from their ancestors?
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What characteristic distinguishes living vascular plants from bryophytes?
What characteristic distinguishes living vascular plants from bryophytes?
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Which of the following statements is true about the life cycle of seedless vascular plants?
Which of the following statements is true about the life cycle of seedless vascular plants?
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Which phylum includes ferns and horsetails?
Which phylum includes ferns and horsetails?
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What role did ancient Lycophytes and Pterophytes play during the Carboniferous period?
What role did ancient Lycophytes and Pterophytes play during the Carboniferous period?
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Which aspect of ferns is notable regarding their species diversity?
Which aspect of ferns is notable regarding their species diversity?
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What is a characteristic feature of horsetails today?
What is a characteristic feature of horsetails today?
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How may increased photosynthesis from ancient forests have affected the climate at the end of the Carboniferous period?
How may increased photosynthesis from ancient forests have affected the climate at the end of the Carboniferous period?
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What type of sperm do seed plants lose that is present in vascular plants?
What type of sperm do seed plants lose that is present in vascular plants?
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Flashcards
Embryophyte
Embryophyte
Plants that exhibit embryonic development; includes land plants.
Charophytes
Charophytes
A group of green algae closely related to land plants; share a common ancestor with them.
Sporopollenin
Sporopollenin
A durable polymer that protects zygotes from drying out in charophytes.
Plant evolution
Plant evolution
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Gymnosperms vs Angiosperms
Gymnosperms vs Angiosperms
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Vascular Plants
Vascular Plants
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Sporophyte
Sporophyte
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Gametophyte
Gametophyte
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Phylum Lycophyta
Phylum Lycophyta
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Phylum Pterophyta
Phylum Pterophyta
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Carboniferous Period
Carboniferous Period
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Horsetails
Horsetails
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Whisk Ferns
Whisk Ferns
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Seed Evolution
Seed Evolution
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Components of a Seed
Components of a Seed
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Key Adaptations for Land
Key Adaptations for Land
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Heterospory
Heterospory
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Megasporangia Function
Megasporangia Function
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Microsporangia Function
Microsporangia Function
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Pollination Process
Pollination Process
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Advantages of Seeds
Advantages of Seeds
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Gymnosperms
Gymnosperms
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Phyla of Gymnosperms
Phyla of Gymnosperms
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Cycadophyta
Cycadophyta
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Ginkgophyta
Ginkgophyta
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Coniferophyta
Coniferophyta
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Pollination in Gymnosperms
Pollination in Gymnosperms
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Cone Structure
Cone Structure
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Life Cycle of Pine
Life Cycle of Pine
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Alternation of generations
Alternation of generations
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Sporangia
Sporangia
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Walled spores
Walled spores
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Gametangia
Gametangia
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Placental transfer cells
Placental transfer cells
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Sporocytes
Sporocytes
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Mycorrhizae
Mycorrhizae
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Phylum Gnetophyta
Phylum Gnetophyta
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Angiosperms
Angiosperms
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Pollination
Pollination
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Monocots
Monocots
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Eudicots
Eudicots
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Anthophyta
Anthophyta
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Agents of Pollination
Agents of Pollination
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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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Description
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.