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Questions and Answers
What type of tropism do shoots of plants exhibit towards light?
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.
Hydrotropism refers to the growth of plant shoots towards water.
False (B)
What is the purpose of positive phototropism in plants?
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.
Roots demonstrate positive ______ by growing towards sources of water.
Match the type of tropism with its description:
Match the type of tropism with its description:
Which type of geotropism do roots exhibit?
Which type of geotropism do roots exhibit?
Negative geotropism refers to roots growing away from gravity.
Negative geotropism refers to roots growing away from gravity.
Describe how positive hydrotropism benefits plants.
Describe how positive hydrotropism benefits plants.
Plants show ______ when they grow in response to gravity.
Plants show ______ when they grow in response to gravity.
Which type of tropism is NOT associated with light?
Which type of tropism is NOT associated with light?
What is the main purpose of the experiment conducted with the seedlings?
What is the main purpose of the experiment conducted with the seedlings?
Roots of plants grow towards light.
Roots of plants grow towards light.
What stimulus is used to observe the selected tropisms in this experiment?
What stimulus is used to observe the selected tropisms in this experiment?
Shoots of seedlings exhibit ___________ phototropism when they grow towards light.
Shoots of seedlings exhibit ___________ phototropism when they grow towards light.
Match the types of tropisms with their correct descriptions:
Match the types of tropisms with their correct descriptions:
Which of the following variables was kept constant during the experiment?
Which of the following variables was kept constant during the experiment?
The shoots of the seedlings grow in the direction of gravity.
The shoots of the seedlings grow in the direction of gravity.
What direction do roots of seedlings typically grow in?
What direction do roots of seedlings typically grow in?
The response of plants to a lack of light is known as __________.
The response of plants to a lack of light is known as __________.
Why are seedlings kept in a dark cupboard during the experiment?
Why are seedlings kept in a dark cupboard during the experiment?
What is the primary purpose of negative geotropism in plants?
What is the primary purpose of negative geotropism in plants?
Positive thigmotropism allows roots to cling to objects for support.
Positive thigmotropism allows roots to cling to objects for support.
What is the definition of nastic movement?
What is the definition of nastic movement?
The response of tendrils to touch is known as ______ thigmotropism.
The response of tendrils to touch is known as ______ thigmotropism.
Match the types of plant movements with their descriptions:
Match the types of plant movements with their descriptions:
What is positive tropism?
What is positive tropism?
Nastic movements in plants occur in a specific direction towards a stimulus.
Nastic movements in plants occur in a specific direction towards a stimulus.
What are the two main types of plant responses to stimuli?
What are the two main types of plant responses to stimuli?
In the phototropism experiment, the manipulated variable is the direction of ____ towards the shoots.
In the phototropism experiment, the manipulated variable is the direction of ____ towards the shoots.
Match the types of tropism with their stimuli:
Match the types of tropism with their stimuli:
What part of the plant typically exhibits positive phototropism?
What part of the plant typically exhibits positive phototropism?
A beaker with an opening at the top is more effective in demonstrating phototropism than one with openings on the side.
A beaker with an opening at the top is more effective in demonstrating phototropism than one with openings on the side.
List one constant variable in the phototropism experiment.
List one constant variable in the phototropism experiment.
What part of the plant primarily responds to water?
What part of the plant primarily responds to water?
Hydrotropism describes a plant's response to light.
Hydrotropism describes a plant's response to light.
What is the hypothesis proposed in the experiment?
What is the hypothesis proposed in the experiment?
In phototropism, plants grow towards the ______.
In phototropism, plants grow towards the ______.
Match the type of tropism with its stimulus:
Match the type of tropism with its stimulus:
What does the anhydrous calcium chloride do in beaker Y?
What does the anhydrous calcium chloride do in beaker Y?
The part of the plant that responds to water shows positive hydrotropism.
The part of the plant that responds to water shows positive hydrotropism.
Name one stimulus that can be detected by plants but not investigated in the experiment.
Name one stimulus that can be detected by plants but not investigated in the experiment.
The absence of light in this experiment ensures that ______ does not affect the results.
The absence of light in this experiment ensures that ______ does not affect the results.
Which variable is manipulated in this experiment?
Which variable is manipulated in this experiment?
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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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