Plant Hormones: Functions and Types
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Questions and Answers

Qual é a função do ácido abscísico (ABA) em plantas?

  • Estimular a formação de flores e frutos
  • Regular a germinação de sementes e prevenir a perda de água (correct)
  • Inibir o crescimento e a diferenciação de raízes
  • Promover a divisão celular e o crescimento

    • Qual é a função do etileno (ET) em plantas?

  • Estimular o crescimento de caules e a expansão celular
  • Regular a senescência das folhas e a queda de flores (correct)
  • Promover a divisão celular e o crescimento de shoots
  • Inibir a germinação de sementes e a formação de raízes

    • Quais são as principais funções dos citocininas em plantas?

  • Regular a abscisão de folhas e a senescência de flores
  • Inibir a germinação de sementes e a formação de raízes
  • Promover a divisão celular e o crescimento de shoots (correct)
  • Estimular a formação de frutos e a expansão celular

    • Qual é a função dos giberelinas (GAs) em plantas?

    <p>Estimular a formação de flores e a elongação de caules</p> Signup and view all the answers

    Qual é a função dos auxinas em plantas?

    <p>Promover a elongação de células e a divisão celular</p> Signup and view all the answers

    Study Notes

    Plant Hormones

    Plant hormones are chemical messengers that regulate various physiological processes in plants. There are five main types of plant hormones: Abscisic Acid, Ethylene, Cytokinins, Gibberellins, and Auxins.

    Abscisic Acid (ABA)

    • Involved in seed dormancy and germination
    • Regulates stomatal closure to prevent water loss
    • Plays a role in response to stress, such as drought, cold, and high salinity
    • Inhibits cell growth and division

    Ethylene (ET)

    • Involved in fruit ripening and senescence
    • Regulates abscission (leaf shedding) and flower senescence
    • Stimulates root growth and differentiation
    • Involved in response to stress, such as wounding and flooding

    Cytokinins

    • Promote cell division and growth
    • Involved in shoot initiation and development
    • Regulate root growth and differentiation
    • Play a role in leaf senescence and abscission

    Gibberellins (GAs)

    • Involved in stem elongation and cell expansion
    • Regulate seed germination and seedling growth
    • Stimulate cell division and growth
    • Involved in flower induction and development

    Auxins

    • Involved in cell elongation and cell division
    • Regulate root growth and differentiation
    • Stimulate shoot growth and development
    • Play a role in apical dominance and tropisms (e.g., phototropism)

    Note: These notes provide a brief overview of the main functions of each plant hormone. Each hormone has a more extensive range of functions, and there is often overlap and interaction between them.

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    Description

    Learn about the five main types of plant hormones, including Abscisic Acid, Ethylene, Cytokinins, Gibberellins, and Auxins, and their roles in regulating various physiological processes in plants.

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