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Plant Responses: Tropism and Nastic Movement
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Plant Responses: Tropism and Nastic Movement

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Questions and Answers

What type of tropism do shoots of plants exhibit towards light?

  • Geotropism
  • Hydrotropism
  • Positive phototropism (correct)
  • Negative phototropism

    • Hydrotropism refers to the growth of plant shoots towards water.

    False

    What is the purpose of positive phototropism in plants?

    To ensure shoots and leaves obtain enough sunlight for photosynthesis.

    Roots demonstrate positive ______ by growing towards sources of water.

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

    Match the type of tropism with its description:

    <p>Phototropism = Growth towards light Hydrotropism = Growth towards water Geotropism = Growth in response to gravity Negative geotropism = Growth away from gravity</p> Signup and view all the answers

    Which type of geotropism do roots exhibit?

    <p>Positive geotropism</p> Signup and view all the answers

    Negative geotropism refers to roots growing away from gravity.

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

    Describe how positive hydrotropism benefits plants.

    <p>It allows roots to grow towards water sources for hydration and nutrient absorption.</p> Signup and view all the answers

    Plants show ______ when they grow in response to gravity.

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

    Which type of tropism is NOT associated with light?

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

    What is the main purpose of the experiment conducted with the seedlings?

    <p>To study the response of plants to gravity and light</p> Signup and view all the answers

    Roots of plants grow towards light.

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

    What stimulus is used to observe the selected tropisms in this experiment?

    <p>Light and gravity</p> Signup and view all the answers

    Shoots of seedlings exhibit ___________ phototropism when they grow towards light.

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

    Match the types of tropisms with their correct descriptions:

    <p>Phototropism = Growth in response to light Geotropism = Growth in response to gravity Hydrotropism = Growth in response to water Thigmotropism = Growth in response to touch</p> Signup and view all the answers

    Which of the following variables was kept constant during the experiment?

    <p>Presence of water</p> Signup and view all the answers

    The shoots of the seedlings grow in the direction of gravity.

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

    What direction do roots of seedlings typically grow in?

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

    The response of plants to a lack of light is known as __________.

    <p>negative phototropism</p> Signup and view all the answers

    Why are seedlings kept in a dark cupboard during the experiment?

    <p>To eliminate light as a variable</p> Signup and view all the answers

    What is the primary purpose of negative geotropism in plants?

    <p>To grow shoots and leaves upwards for photosynthesis</p> Signup and view all the answers

    Positive thigmotropism allows roots to cling to objects for support.

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

    What is the definition of nastic movement?

    <p>Nastic movement is the response towards a stimulus such as touch that does not depend on the direction of the stimulus.</p> Signup and view all the answers

    The response of tendrils to touch is known as ______ thigmotropism.

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

    Match the types of plant movements with their descriptions:

    <p>Positive geotropism = Roots grow downwards Negative geotropism = Shoots grow upwards Positive thigmotropism = Tendrils cling to objects Nastic movement = Non-directional response to stimuli</p> Signup and view all the answers

    What is positive tropism?

    <p>Growth towards a stimulus</p> Signup and view all the answers

    Nastic movements in plants occur in a specific direction towards a stimulus.

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

    What are the two main types of plant responses to stimuli?

    <p>Tropism and nastic movement</p> Signup and view all the answers

    In the phototropism experiment, the manipulated variable is the direction of ____ towards the shoots.

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

    Match the types of tropism with their stimuli:

    <p>Phototropism = Light Hydrotropism = Water Gravitropism = Gravity Thigmotropism = Touch</p> Signup and view all the answers

    What part of the plant typically exhibits positive phototropism?

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

    A beaker with an opening at the top is more effective in demonstrating phototropism than one with openings on the side.

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

    List one constant variable in the phototropism experiment.

    <p>Seedlings of the same type and height</p> Signup and view all the answers

    What part of the plant primarily responds to water?

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

    Hydrotropism describes a plant's response to light.

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

    What is the hypothesis proposed in the experiment?

    <p>Roots of plants grow in the direction of water.</p> Signup and view all the answers

    In phototropism, plants grow towards the ______.

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

    Match the type of tropism with its stimulus:

    <p>Hydrotropism = Water Phototropism = Light Geotropism = Gravity Thigmotropism = Touch</p> Signup and view all the answers

    What does the anhydrous calcium chloride do in beaker Y?

    <p>Absorbs moisture</p> Signup and view all the answers

    The part of the plant that responds to water shows positive hydrotropism.

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

    Name one stimulus that can be detected by plants but not investigated in the experiment.

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

    The absence of light in this experiment ensures that ______ does not affect the results.

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

    Which variable is manipulated in this experiment?

    <p>Presence of a source of water</p> Signup and view all the answers

    Study Notes

    Plant Responses to Stimuli

    • Plant responses can be categorized into tropism and nastic movement.

    Tropism

    • Directional growth response to environmental stimuli such as light, water, gravity, and touch.
    • Positive tropism: Growth towards stimulus; Negative tropism: Growth away from stimulus.
    • Responses occur gradually and are less pronounced.

    Phototropism

    • Shoots of plants exhibit positive phototropism, growing towards light for photosynthesis.
    • Experimental setup involves observing seedling growth in different light directions.
    • Essential for maximizing light absorption for energy production.

    Hydrotropism

    • Roots display positive hydrotropism, growing toward water sources.
    • Facilitates acquisition of water and nutrients essential for plant health and photosynthesis.

    Geotropism

    • Roots exhibit positive geotropism, growing downward towards gravity; shoots show negative geotropism, growing upwards away from gravity.
    • Helps stabilize plants and ensures optimal resource access.

    Thigmotropism

    • Response towards touch; tendrils exhibit positive thigmotropism by clinging to supports.
    • Roots demonstrate negative thigmotropism, avoiding obstacles in search of water.

    Nastic Movement

    • Nastic movement occurs as a response to stimuli but is non-directional.
    • Faster than tropic responses; e.g., Mimosa sp. leaves fold inward when touched for defense.
    • Enables quick reactions to environmental changes without directional influence.

    Experimental Methods

    • Controlled experiments with variables like light direction, water presence, and darkness help determine plant responses.
    • Observations include sketching plant positions before and after stimulus exposure.

    Importance of Responses

    • Plant responsiveness to stimuli is critical for survival, adaptation, and optimization of growth conditions.

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    Description

    Explore the fascinating world of plant responses with this quiz on tropism and nastic movements. Understand how plants react directionally to stimuli like light and temperature, and discover the differences between these two types of responses. Test your knowledge with questions that highlight key concepts from plant biology.

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