Plant Tropisms Quiz
29 Questions
16 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the role of auxin in plants?

  • Promotion of leaf growth
  • Enhancement of root branching
  • Stimulation of cell elongation (correct)
  • Inhibition of cell elongation

Which of the following is NOT a common plant tropism stimulus?

  • Gravity
  • Light
  • Wind (correct)
  • Touch

How do animals typically respond to unfavorable environmental conditions compared to plants?

  • By changing their location (correct)
  • By undergoing photosynthesis
  • By producing more auxin
  • By increasing root growth

What is the term for a detectable change in an organism's internal or external environment that provokes a reaction?

<p>Stimuli (B)</p> Signup and view all the answers

Which process involves the growth or turning movement of an organism in response to an environmental stimulus?

<p>Tropism (B)</p> Signup and view all the answers

What is the main difference between how animals and plants handle environmental changes?

<p>Animals adapt by moving (D)</p> Signup and view all the answers

What is the definition of thigmotropism?

<p>Directional movement of plants in response to touch (B)</p> Signup and view all the answers

Which plant part exhibits positive thigmotropism?

<p>Tendrils (C)</p> Signup and view all the answers

How do roots exhibit negative thigmotropism?

<p>Growing away from the touch stimulus (C)</p> Signup and view all the answers

Which specialized plastids help plants respond to gravity?

<p>Amyloplasts (B)</p> Signup and view all the answers

What type of tropism involves growth towards the light source?

<p>Phototropism (A)</p> Signup and view all the answers

In what way do tendrils help climbing plants?

<p>Supporting the plant structure (A)</p> Signup and view all the answers

What is the term for directional growth in response to water concentrations?

<p>Hydrotropism (B)</p> Signup and view all the answers

Which type of tropism occurs when an organism grows towards the source of heat?

<p>Positive Thermotropism (C)</p> Signup and view all the answers

What is the movement of a plant in response to a change in temperature called?

<p>Thermotropism (D)</p> Signup and view all the answers

Which tropism involves the plant moving away from moisture?

<p>Negative Hydrotropism (D)</p> Signup and view all the answers

What are statoliths and what role do they play in plant growth?

<p>They are gravity-sensing organelles that aid in plant movement. (A)</p> Signup and view all the answers

Which term refers to observable biological oscillations that occur with a 24-hour periodicity?

<p>Circadian Rhythms (B)</p> Signup and view all the answers

What is the main cause of plant tropisms?

<p>Differential growth (B)</p> Signup and view all the answers

What is the term for growth in the direction of a stimulus?

<p>Positive tropism (A)</p> Signup and view all the answers

Which phenomenon describes a plant bending toward light?

<p>Phototropism (A)</p> Signup and view all the answers

What is the main difference between nastic movements and tropisms?

<p>Directionality of response (D)</p> Signup and view all the answers

What causes cells on the shaded side of the stem to elongate at a greater rate?

<p>Accumulation of auxins (C)</p> Signup and view all the answers

What do tropisms refer to in plants?

<p>Movement in response to stimuli (A)</p> Signup and view all the answers

Why do plants exhibit phototropism?

<p>To get as much light as possible for photosynthesis (A)</p> Signup and view all the answers

Which of the following is an example of a tropism?

<p>A plant growing towards sunlight (A)</p> Signup and view all the answers

What is the role of plant hormones, such as auxins, in phototropism?

<p>Directing growth by accumulating on the shaded side of the stem (B)</p> Signup and view all the answers

How do plants respond during nastic movements?

<p>With non-directional responses (C)</p> Signup and view all the answers

What allows plants to exhibit movement in response to various environmental stimuli?

<p>Mechanisms called tropisms (A)</p> Signup and view all the answers

Flashcards

Stimulus

A detectable change in an organism's internal or external environment that triggers a reaction.

Tropism

The growth or turning movement of an organism in response to an environmental stimulus.

Gravitropism

The growth movement of a plant in response to gravity.

Phototropism

The growth movement of a plant in response to light.

Signup and view all the flashcards

Thigmotropism

The growth movement of a plant in response to touch or contact.

Signup and view all the flashcards

Hydrotropism

The growth movement of a plant in response to water concentrations.

Signup and view all the flashcards

Thermotropism

The growth movement of a plant in response to temperature.

Signup and view all the flashcards

Statioliths

Specialized plastids found in root cells that help plants sense gravity and respond through gravitropism.

Signup and view all the flashcards

Circadian rhythm

Observable biological oscillations that occur with a 24-hour periodicity, influencing various plant processes.

Signup and view all the flashcards

Positive tropism

Growth in the direction of a stimulus.

Signup and view all the flashcards

Negative tropism

Growth away from a stimulus.

Signup and view all the flashcards

Nastic movements

Non-directional responses to stimuli, such as the closing of a Venus flytrap or the opening and closing of flowers.

Signup and view all the flashcards

Tendrils and Climbing Plants

Tendrils, which exhibit thigmotropism, provide support for climbing plants, enabling them to reach sunlight.

Signup and view all the flashcards

Cell Elongation and Phototropism

Auxin, concentrated on the shaded side of a stem, stimulates cell elongation, causing the stem to bend towards light.

Signup and view all the flashcards

Plant Tropisms: The Cause

Hormonal imbalances, primarily involving auxin distribution, are the main cause of plant tropisms.

Signup and view all the flashcards

Why Plants Exhibit Phototropism

Phototropism helps plants maximize sunlight exposure, crucial for photosynthesis.

Signup and view all the flashcards

Plant Hormones and Phototropism

Plant hormones like auxins play a crucial role in phototropism, influencing cell elongation on the shaded side of a stem.

Signup and view all the flashcards

Nastic Movements in Plants

Plants respond to certain stimuli regardless of direction, displaying nastic movements.

Signup and view all the flashcards

Plants' Ability to Respond to Stimuli

Plant cells are equipped with mechanisms that allow them to detect and respond to diverse environmental stimuli, facilitating growth and adaptation.

Signup and view all the flashcards

Auxin's Role in Plants

Auxin plays a crucial role in plant growth, regulating various processes like cell elongation, root development, and fruit ripening.

Signup and view all the flashcards

Animals' Response to Unfavorable Conditions

Animals typically move away from unfavorable conditions, demonstrating a behavioral response.

Signup and view all the flashcards

Plants' Responses to Unfavorable Conditions

Plants, due to their immobility, respond via growth adjustments and internal physiological changes.

Signup and view all the flashcards

Positive Thigmotropism

Tendrils exhibit positive thigmotropism, coiling around surfaces for support.

Signup and view all the flashcards

Negative Thigmotropism in Roots

Roots show negative thigmotropism, growing away from solid objects to navigate through soil.

Signup and view all the flashcards

Thermonasty

Thermonasty describes the movement of a plant in response to a change in temperature.

Signup and view all the flashcards

Negative Hydrotropism

Negative hydrotropism involves a plant moving away from moisture.

Signup and view all the flashcards

Statioliths and Plant Growth

Statioliths are specialized plastids found in root cells that settle at the bottom, signaling the direction of gravity and influencing root growth.

Signup and view all the flashcards

Example of Tropism

A vine growing around a pole is an example of thigmotropism.

Signup and view all the flashcards

Tropisms: Defining Plant Growth Response

Tropisms refer to growth movements of plants in response to specific stimuli.

Signup and view all the flashcards

Study Notes

Auxin's Role in Plants

  • Auxin plays a crucial role in plant growth, regulating various processes like cell elongation, root development, and fruit ripening.

Plant Tropism Stimuli

  • Gravity (gravitropism)
  • Light (phototropism)
  • Touch (thigmotropism)
  • Water (hydrotropism)
  • Temperature (thermotropism)

Animal vs. Plant Responses to Unfavorable Conditions

  • Animals typically move away from unfavorable conditions, demonstrating a behavioral response.
  • Plants, due to their immobility, respond via growth adjustments and internal physiological changes.

Stimulus and Response in Organisms

  • Stimulus refers to a detectable change in an organism's internal or external environment that triggers a reaction.

Tropism Explained

  • Tropism is the growth or turning movement of an organism in response to an environmental stimulus.

Differences in Environmental Response

  • Animals exhibit behavioral responses to environmental changes.
  • Plants demonstrate growth-oriented responses, adapting their structure and physiology to change.

Thigmotropism Defined

  • Thigmotropism is the growth movement of a plant in response to touch or contact.

Positive Thigmotropism

  • Tendrils exhibit positive thigmotropism, coiling around surfaces for support.

Negative Thigmotropism in Roots

  • Roots show negative thigmotropism, growing away from solid objects to navigate through soil.

Statioliths: Plant's Gravity Sensors

  • Statioliths, specialized plastids found in root cells, help plants sense gravity and respond through gravitropism.

Phototropism: Growing towards Light

  • Phototropism is the growth of a plant towards a light source.

Tendrils and Climbing Plants

  • Tendrils, which exhibit thigmotropism, provide support for climbing plants, enabling them to reach sunlight.

Hydrotropism: Following Water

  • Hydrotropism is the directional growth of a plant in response to water concentrations.

Thermotropism: Growing Towards Heat

  • Thermotropism is the growth of an organism towards the source of heat.

Plant Movement in Response to Temperature

  • Thermonasty describes the movement of a plant in response to a change in temperature.

Negative Hydrotropism

  • Negative hydrotropism involves a plant moving away from moisture.

Statioliths and Plant Growth

  • Statioliths are specialized plastids found in root cells that settle at the bottom, signaling the direction of gravity and influencing root growth.

Circadian Rhythm Explained

  • Circadian rhythms are observable biological oscillations that occur with a 24-hour periodicity, influencing various plant processes.

Plant Tropisms: The Cause

  • Hormonal imbalances, primarily involving auxin distribution, are the main cause of plant tropisms.

Growth Towards Stimulus

  • Positive tropism refers to growth in the direction of a stimulus.

Phototropism: Bending Towards Light

  • Phototropism describes the bending of a plant towards a light source.

Nastic Movement vs. Tropism

  • Nastic movements are non-directional responses to stimuli, whereas tropisms are directional growth responses.

Cell Elongation and Phototropism

  • Auxin, concentrated on the shaded side of a stem, stimulates cell elongation, causing the stem to bend towards light.

Tropisms: Defining Plant Growth Response

  • Tropisms refer to growth movements of plants in response to specific stimuli.

Why Plants Exhibit Phototropism

  • Phototropism helps plants maximize sunlight exposure, crucial for photosynthesis.

Example of Tropism

  • A vine growing around a pole is an example of thigmotropism.

Plant Hormones and Phototropism

  • Plant hormones like auxins play a crucial role in phototropism, influencing cell elongation on the shaded side of a stem.

Nastic Movements in Plants

  • Plants respond to certain stimuli regardless of direction, displaying nastic movements. Examples include the closing of a Venus flytrap or the opening and closing of flowers throughout the day.

Plants' Ability to Respond to Stimuli

  • Plant cells are equipped with mechanisms that allow them to detect and respond to diverse environmental stimuli, facilitating growth and adaptation.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Quiz Team

Description

Test your knowledge on plant tropisms such as positive phototropism, negative phototropism, and thigmotropism. Learn how plants respond to light and touch stimuli.

More Like This

Use Quizgecko on...
Browser
Open
Browser
Browser