Plants Water Control Mechanisms Quiz
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Questions and Answers

Which plant hormone is known to delay senescence in leaf tissues and promote mitosis?

  • Cytokinins (correct)
  • Gibberellins
  • Abscisic acid
  • Ethylene

    • What is the primary effect of gibberellins on plant growth and development?

  • Stimulating shoot elongation (correct)
  • Activating plant responses to herbivore wounds
  • Promoting fruit ripening
  • Causing abscission of leaves

    • Which plant hormone accumulates in response to environmental stresses like dehydration or cold temperatures?

  • Cytokinins
  • Gibberellins
  • Abscisic acid (correct)
  • Ethylene

    • What is the primary effect of ethylene on plant development?

    <p>Promoting fruit ripening, flower wilting, and leaf fall</p> Signup and view all the answers

    Which plant hormone is unusual in that it is a volatile gas?

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

    What is the primary function of the plant hormone systemin?

    <p>Activating plant responses to herbivore wounds</p> Signup and view all the answers

    How do plants in dry habitats, like xerophytes, reduce water loss?

    <p>By having a waxy coating on leaves and stems</p> Signup and view all the answers

    What is the key function of vacuoles in plant cells concerning water management?

    <p>Balancing water levels inside the cell</p> Signup and view all the answers

    Which type of plant can easily get more water from the soil and may have a waxy coating to prevent water loss?

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

    What is the role of kidneys in animals' excretory system concerning water balance?

    <p>Filtering blood and absorbing water</p> Signup and view all the answers

    Which hormone is responsible for controlling water absorption in the kidneys?

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

    How do plants in water environments, like hydrophytes, absorb water?

    <p>By absorbing it directly through their surfaces</p> Signup and view all the answers

    What is the main function of the Central Nervous System (CNS)?

    <p>Sends commands to the body</p> Signup and view all the answers

    Which part of the nervous system prepares the body for 'fight-or-flight' responses?

    <p>Sympathetic Nervous System</p> Signup and view all the answers

    How does the endocrine system primarily signal within the body?

    <p>By using chemical signals called hormones</p> Signup and view all the answers

    Which system helps maintain balance in the body through negative feedback mechanisms?

    <p>Endocrine System</p> Signup and view all the answers

    Which hormone works to keep blood sugar levels stable?

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

    What is the role of the Parasympathetic Nervous System?

    <p>Is active during restful periods like slowing heart rate</p> Signup and view all the answers

    Which plant hormone plays a crucial role in initiating the ripening process of fruits?

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

    What is the primary function of stomatal opening in plants?

    <p>Enable gas exchange for photosynthesis</p> Signup and view all the answers

    In drought conditions, what is the immediate response of plants to conserve water?

    <p>Closing stomata</p> Signup and view all the answers

    Which type of plant movement describes a rapid response to touch stimuli?

    <p>Fast thigmotropism</p> Signup and view all the answers

    What is the primary function of imbibition (water intake) during seed germination?

    <p>Trigger the breakdown of dormancy mechanisms</p> Signup and view all the answers

    What is the main function of osmoregulation in organisms?

    <p>To maintain the right balance of water and salts</p> Signup and view all the answers

    Which type of organisms typically exhibit osmoconformers osmoregulation?

    <p>Marine invertebrates</p> Signup and view all the answers

    What strategy do bacteria use when the osmolarity around them increases?

    <p>Use transport mechanisms to absorb electrolytes</p> Signup and view all the answers

    Which process do protozoa use to transport ammonia and excretory wastes from the cytoplasm to the cell membrane?

    <p>Contractile vacuoles</p> Signup and view all the answers

    What distinguishes osmoregulators from osmoconformers?

    <p>Osmoregulators maintain the same internal osmolarity as the environment</p> Signup and view all the answers

    What is the main purpose of synthesizing osmoprotectant molecules in bacteria?

    <p>To protect against osmotic stress</p> Signup and view all the answers

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