Plant Tissues Overview
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Questions and Answers

What is the primary function of meristematic tissue in plants?

  • Storage of nutrients and water
  • Protection against pathogens
  • Production of new cells (correct)
  • Photosynthesis
  • Which type of meristem specifically leads to the increase in length of stems and roots?

  • Lateral meristem
  • Apical meristem (correct)
  • Vascular cambium
  • Intercalary meristem
  • What process allows a differentiated cell to revert to a meristematic state?

  • Mitosis
  • Dedifferentiation (correct)
  • Differentiation
  • Cell elongation
  • Which type of permanent tissue consists of only one kind of cell?

    <p>Simple tissue</p> Signup and view all the answers

    Which of the following cells are responsible for controlling gas exchange in plants?

    <p>Guard cells</p> Signup and view all the answers

    What is the main role of parenchyma tissue in plants?

    <p>Manufacture and store food</p> Signup and view all the answers

    What is cutin and its primary function in plant tissues?

    <p>A waxy layer preventing water loss</p> Signup and view all the answers

    Which of the following types of meristem is not typically found in monocot plants?

    <p>Vascular cambium</p> Signup and view all the answers

    Which cell type in collenchyma provides flexible support due to its unevenly thickened walls?

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

    What is the primary function of sclerenchyma tissue?

    <p>Providing rigid support</p> Signup and view all the answers

    Which type of xylem conducting cell is characterized by being wider and more efficient in transporting water than tracheids?

    <p>Vessel elements</p> Signup and view all the answers

    What component of phloem acts as a sieve plate, facilitating the flow of nutrients?

    <p>Sieve plates</p> Signup and view all the answers

    Which of the following correctly describes the root system of a plant?

    <p>Includes all roots below ground</p> Signup and view all the answers

    Which structure serves as the embryonic root in a germinating seed?

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

    What term is used to describe the contents transported by xylem and phloem?

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

    Which type of shoot is defined as having leaves, but no reproductive structures?

    <p>Vegetative shoot</p> Signup and view all the answers

    What does the vascular cambium primarily produce?

    <p>Xylem and phloem</p> Signup and view all the answers

    What is heartwood?

    <p>Older xylem that no longer conducts water</p> Signup and view all the answers

    Which modified stem is responsible for food storage underground?

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

    Which part of the leaf is primarily involved in gas exchange?

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

    What issue is mitigated by the epidermis of the leaf?

    <p>Water loss and abrasions</p> Signup and view all the answers

    How are the veins arranged in monocots?

    <p>Parallel venation</p> Signup and view all the answers

    What primary function is associated with guard cells?

    <p>Controlling stomata opening</p> Signup and view all the answers

    During leaf development, what do leaf primordia emerge from?

    <p>Shoot apical meristem</p> Signup and view all the answers

    Which hormone is primarily associated with the growth response of plants to light?

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

    What effect does ethylene have on plant growth?

    <p>Thickens the stem or root</p> Signup and view all the answers

    What type of growth response is positive gravitropism?

    <p>Roots grow toward gravity</p> Signup and view all the answers

    Which plant hormone is synthesized during stress and acts as a growth inhibitor?

    <p>Abscisic acid</p> Signup and view all the answers

    What is the primary function of gibberellins in plants?

    <p>Stimulate cell elongation</p> Signup and view all the answers

    What type of plant exhibits a short-day photoperiodism?

    <p>Plants that require longer nights to flower</p> Signup and view all the answers

    What effect does phototropism have on stem growth?

    <p>Stems bend toward light</p> Signup and view all the answers

    Which hormone is notably used in plant tissue cultures for the production of shoot buds?

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

    What defines a long-day plant (LDP)?

    <p>Flowers only when the day length is longer than critical</p> Signup and view all the answers

    Which layer of soil is primarily composed of partially decomposed organic material?

    <p>Horizon O</p> Signup and view all the answers

    Which of the following best describes the rhizosphere?

    <p>Area enriched with nitrogen-fixing bacteria around plant roots</p> Signup and view all the answers

    What is a characteristic of mineral soil?

    <p>Less than 12-20% organic carbon content</p> Signup and view all the answers

    What process involves the conversion of nitrogen gas into usable forms like nitrate or ammonium?

    <p>Nitrogen Fixation</p> Signup and view all the answers

    In terms of soil solution, what happens in waterlogged soil?

    <p>It can quickly become anoxic due to low oxygen</p> Signup and view all the answers

    Which type of nutrients are considered macronutrients for plants?

    <p>N, P, K, Ca, Mg, S</p> Signup and view all the answers

    What is the main role of organic acids excreted by microorganisms in soil?

    <p>To dissolve rock into smaller particles</p> Signup and view all the answers

    Study Notes

    Meristematic Tissue

    • Primary function: Growth and development of plants
    • Apical meristem: Responsible for the increase in length of stems and roots
    • Dedifferentiation: The process allowing a differentiated cell to revert to a meristematic state

    Plant Tissues

    • Simple permanent tissue: Consists of only one kind of cell
    • Guard cells: Responsible for controlling gas exchange in plants
    • Parenchyma tissue: Involved in storage, photosynthesis, and secretion
    • Cutin: Waxy substance that protects plant tissues from water loss

    Plant Growth and Structure

    • Lateral meristem: Not typically found in monocot plants
    • Collenchyma tissue: Provides flexible support; unevenly thickened walls
    • Sclerenchyma tissue: Provides structural support and strength
    • Vessel elements: Wider and more efficient in transporting water than tracheids
    • Sieve tube elements: Act as a sieve plate in phloem, facilitating nutrient flow
    • Taproot system: Characterized by a main primary root with lateral branches
    • Radicle: The embryonic root in a germinating seed
    • Translocate: Term describing the movement of substances through the xylem and phloem
    • Vegetative shoot: Consists of leaves, but no reproductive structures
    • Vascular cambium: Produces xylem and phloem
    • Heartwood: Inactive, dark-colored wood in the center of a tree
    • Bulb: A modified stem responsible for food storage underground

    Leaf Structure and Function

    • Stomata: Primarily involved in gas exchange in leaves
    • Epidermis: Protects the leaf from water loss and disease
    • Parallel venation: The arrangement of veins in monocots
    • Guard cells: Control the opening and closing of stomata

    Plant Development and Hormones

    • Leaf primordia: Leaf buds emerge from these structures during development
    • Auxin: Hormone responsible for growth responses to light
    • Ethylene: Promotes fruit ripening and leaf abscission
    • Positive gravitropism: Growth response in which a part of the plant grows downwards
    • Abscisic acid: A stress hormone that inhibits growth
    • Gibberellins: Stimulate stem elongation and seed germination

    Plant Growth and Reproduction

    • Short-day plant: Requires a short period of light each day to flower
    • Phototropism: Stem growth in response to light
    • Cytokinin: Used in plant tissue cultures for the production of shoot buds
    • Long-day plant (LDP): Requires a long period of light each day to flower

    Soil and Plant Nutrition

    • Topsoil: Layer of soil primarily composed of partially decomposed organic material
    • Rhizosphere: The area of soil surrounding plant roots
    • Mineral soil: Characterized by a granular texture
    • Nitrogen fixation: The conversion of nitrogen gas into usable forms
    • Waterlogged soil: Reduces oxygen availability, affecting plant growth
    • Macronutrients: Essential elements required in larger quantities by plants
    • Organic acids: Excreted by microorganisms in soil, helping dissolve minerals

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    Description

    This quiz covers various plant tissues, including meristematic and permanent tissues, as well as dermal layers like the epidermis and periderm. Explore the roles of different types of tissues in plant growth and protection, highlighting their functions and structures.

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