Biology: Plant Importance and Structure
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Questions and Answers

What is one primary role that plants play in the environment that directly supports animal life?

  • Creating habitats for terrestrial animals
  • Producing carbon dioxide for respiration
  • Producing oxygen (correct)
  • Absorbing heat from sunlight
  • Which statement about plant cell growth is accurate?

  • Plant cells grow predominantly through the whole body.
  • Plant cells can only grow at a definite rate.
  • Plant growth occurs indefinitely throughout their life. (correct)
  • Plant growth is limited to specific seasons.
  • How do plants primarily respond to stimuli compared to animals?

  • Plants respond faster than animals due to their advanced nervous systems.
  • Plants can quickly react due to their ability to move whole bodies.
  • Plants have no specialized mechanisms for response. (correct)
  • Plants utilize receptors to respond to environmental changes.
  • In which way do plant and animal cells differ in terms of waste excretion?

    <p>Plants produce less waste and have no specialized excretory system.</p> Signup and view all the answers

    What is the primary function of the periderm in plants?

    <p>Replacement of the epidermis during growth</p> Signup and view all the answers

    What is a significant difference in movement capabilities between plants and animals?

    <p>Plants are typically fixed to the ground and move slowly as a result of growth.</p> Signup and view all the answers

    What role do plants play in beautifying environments?

    <p>Plants have the capability to produce fragrances that enhance surroundings.</p> Signup and view all the answers

    Which part of the plant is primarily involved in transporting food made in mature leaves?

    <p>Phloem</p> Signup and view all the answers

    What distinguishes vessel elements from tracheids in xylem tissue?

    <p>Vessel elements are less tapered and wider than tracheids</p> Signup and view all the answers

    What is the function of ground tissue in dicot stems?

    <p>Support and storage</p> Signup and view all the answers

    What occurs to chloroplasts as plants age or fruits ripen?

    <p>They convert into chromoplasts</p> Signup and view all the answers

    Which of the following is NOT a function of chloroplasts?

    <p>Transport of minerals</p> Signup and view all the answers

    What role do the subterranean and aerial systems of plants play in their survival?

    <p>The subterranean system provides sugar to aerial tissues, while the aerial system supplies water and minerals to roots.</p> Signup and view all the answers

    Which characteristic is true regarding the leaf structures of monocots and dicots?

    <p>Leaves of monocots mainly have parallel obvious veins, while dicots have a complex branching network.</p> Signup and view all the answers

    Which modification of plant leaves does not typically serve a photosynthetic function?

    <p>Tendrils that assist in climbing.</p> Signup and view all the answers

    In what manner do monocots anchor themselves compared to dicots?

    <p>Monocots have fibrous root systems that spread out, ensuring stability and access to moisture.</p> Signup and view all the answers

    How do taxonomists differentiate between plant species based on their leaves?

    <p>Through the pattern of veins, leaf arrangement, and shape.</p> Signup and view all the answers

    What is NOT a typical characteristic of compound leaves?

    <p>They originate from the base of each leaflet.</p> Signup and view all the answers

    Which of the following statements about leaf functions is accurate?

    <p>Leaves mainly serve as sites for gas exchange and water regulation.</p> Signup and view all the answers

    Which leaf adaptation is specifically designed to attract pollinators?

    <p>Brightly colored leaves.</p> Signup and view all the answers

    What primary role do taproots serve in addition to anchoring the plant?

    <p>Storing food for flowering and fruit production</p> Signup and view all the answers

    What characteristic of root hairs enhances their function in water and mineral absorption?

    <p>Their vast numbers increasing surface area</p> Signup and view all the answers

    Which type of roots do corn plants possess that help support their tall stems?

    <p>Adventitious roots</p> Signup and view all the answers

    What is the main function of apical meristem in shoots?

    <p>Dividing indefinitely to produce differentiated tissues</p> Signup and view all the answers

    What effect does the presence of a terminal bud have on axillary buds?

    <p>Inhibits their growth creating apical dominance</p> Signup and view all the answers

    What is the primary function of the epidermis in plant tissues?

    <p>Covering and protecting young parts of the plant</p> Signup and view all the answers

    What specialized structure of the epidermis helps roots retain water?

    <p>Cuticle</p> Signup and view all the answers

    Which structure represents the points at which leaves are attached on a stem?

    <p>Nodes</p> Signup and view all the answers

    What is a function of a plant’s shoot system?

    <p>Carrying out photosynthesis</p> Signup and view all the answers

    What happens to axillary buds when the terminal bud is absent?

    <p>They break dominance and grow into new branches</p> Signup and view all the answers

    Study Notes

    Plant Importance

    • Plants are essential for life on Earth, providing food for humans and animals.
    • They produce oxygen, regulate temperature, and improve air quality.
    • Plants help slow wind speeds, provide habitats for wildlife, and beautify surroundings.
    • They are a source of building materials, fuel, and paper products.
    • Plants are also a source of medicines and dyes.

    Plant vs Animal Cells

    • Plant cells grow indefinitely, while animal cells have a finite growth period.
    • Plant cells produce less waste products than animal cells.
    • Animal cells have a more developed excretory system.
    • Plant cells have lower respiration rates compared to animal cells.
    • Animals are capable of whole-body movement, while plants are generally fixed.
    • Animal cells have receptors and a nervous system; plants do not.
    • Animals respond more quickly to stimuli than plants.

    Plant Structure and Adaptation

    • Plants have adapted to two environments: soil for water and minerals, and air for CO2 and light.
    • Plants have evolved two systems: a subterranean root system and an aerial shoot system.
    • Roots lack chloroplasts and depend on the shoot system for sugars and organic nutrients.
    • The shoot system, including flowers, relies on water and minerals from the roots.
    • Leaves are the primary photosynthetic organs, with a flattened blade and stalk.
    • Leaf shapes, arrangements, and vein patterns are used for plant identification.
    • Leaves can be adapted for various functions, including tendrils for climbing, spines for defense, and water storage.

    Monocot and Dicot Plants

    • Monocots have fibrous roots, which spread out and anchor them firmly.
    • Dicots have taproot systems with a large vertical root and smaller lateral roots.
    • Monocots have parallel veins in their leaves, while dicots have branched, netted veins.
    • Both monocots and dicots have root hairs that increase the surface area for water and mineral absorption.

    Root System

    • Root hairs near the tips of roots are responsible for most water and mineral absorption.
    • Adventitious roots can grow above ground from stems or leaves, providing support for the plant.

    Shoot System

    • Shoots consist of stems and leaves and can be vegetative (leaf-bearing) or reproductive (flower-bearing).
    • Stems have nodes (points of leaf attachment) and internodes (segments between nodes).
    • Axillary buds at the leaf and stem junction can develop into vegetative branches.
    • Terminal buds at the shoot apex contain apical meristem tissue, which produces differentiated tissues.
    • Apical dominance inhibits axillary bud growth, promoting vertical growth for better light exposure.

    Plant Tissue Systems

    • Dermal Tissue: The outer protective layer of plants.
      • The epidermis covers young plant parts and includes root hairs and a waxy cuticle.
      • The periderm replaces the epidermis during growth, forming bark on trees.
    • Vascular Tissue: Responsible for transporting substances within the plant.
      • Xylem: Transports water and minerals upwards.
      • Phloem: Transports sugars and other organic compounds.
    • Ground Tissue: All other tissues in the plant.
      • Functions include photosynthesis, storage, and support.

    Plastids

    • Chloroplasts: Double-membrane organelles responsible for photosynthesis.
      • Contain chlorophyll, carotenoids, DNA, and other essential molecules.
      • Function in protein synthesis, lipid production, and the synthesis of phytohormones, vitamins, and metabolites.
    • Chromoplasts: Derived from chloroplasts, responsible for the colors of fruits, flowers, and roots.
      • Accumulation of carotenoid pigments creates vibrant colors for attracting animals for seed dispersal.

    Microscope Parts and Techniques

    • Knowledge of microscope parts and techniques is essential for plant cell observation and analysis.

    Carbohydrates as Reserved Nutrients

    • Starch: The primary form of stored carbon in plants.
      • Found as semi-crystalline granules composed of branched and linear glucose polymers.
      • Starch granules vary in size and shape, aiding in plant identification.
    • Simple Starch: Nuclei shaped like circles.
    • Compound Starch: Has a line in the middle of the nucleus.
    • Concentric Starch: Nucleus located in the center.
    • Eccentric Starch: Nucleus located off-center.

    Fats as Reserved Nutrients

    • Storage lipids are accumulated in the embryo (cotyledons) or endosperm of seeds.
    • Oilseeds store lipids mainly in their cotyledons.

    Proteins as Reserved Nutrients

    • Albumins: Water-soluble proteins found mainly in seeds.
    • Globulins: Water-insoluble proteins commonly found in legume seeds.
    • Prolamins and Glutelins: Proteins found in crop seeds, forming gluten.
    • Aleurone: Protein granules found in maturing seeds and tubers.
      • Present in the outermost layer of the endosperm, followed by the starchy endosperm.

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