The Question is from neet-botany biodiversity , and it was created by the author NISHANTH

Question

A defining feature of living organisms is their ability to respond to stimuli. Which of these is an example of a plant responding to a stimulus?

NISHANTH · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Stimulus and Response in Living Organisms
 **Related Topics**: Plant physiology, Tropisms, Phototropism
 **Prerequisites**: Basic understanding of living organisms and their characteristics.
## SOLUTION PATHWAY
**Given Information**:
  The question asks for an example of a plant responding to a stimulus.
  Options include various physical processes.
**Method & Steps**:
 1. Analyze each option to determine if it represents a response to a stimulus by a living organism.
  Reasoning: A stimulus is a detectable change in the internal or external environment that evokes a response. A response is a reaction to a stimulus.
  Formula/Rule:  N/A
 2. Option A: A rock rolling down a hill is a purely physical process, not a biological response to a stimulus.
  Working: Rocks are non-living and do not respond to stimuli.
  Key Point:  Distinguish between physical processes and biological responses.
 3. Option B: Water evaporating from a puddle is a physical process, not a biological response.
  Working: Evaporation is a physical change driven by temperature and not a response by a living organism.
  Key Point:  Understand the difference between living and non-living entities.
 4. Option C: Phototropism in a sunflower is a classic example of a plant responding to a stimulus (light).
  Working: Sunflowers turn their heads (grow towards) the sun, demonstrating a response to light.
  Key Point: Phototropism is a plant's growth response to light.
 5. Option D: Salt dissolving in water is a physical process, not a biological response.
  Working: Dissolving salt is a chemical change, not a biological response to a stimulus.
  Key Point:  Focus on biological processes.
 6. Therefore, only option C demonstrates a plant responding to a stimulus (light).
  Result: Phototropism in a sunflower (Option C)
  Verification: The definition of a stimulus and response is satisfied by this example.
 ## OPTION ANALYSIS
A :x: This is a purely physical process involving a non-living object.
B :x: This is a physical process of evaporation, not a biological response.
C ✓: Phototropism is a plant's directional growth response to a light stimulus.  This is a classic example of a living organism responding to its environment.
D :x: This is a chemical process, not a biological response by a living organism.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing physical processes with biological responses:  Carefully consider whether the process is driven by a living organism reacting to a change in its environment.
  2.Failing to understand the definition of a stimulus and response: A stimulus is a detectable change that evokes a response from a living organism.
 **Quick Tips**:
  1.Identify the living organism in the option and look for a change in its behavior or growth in response to the surrounding environment.
  2. Remember the key characteristics of living organisms, including their ability to respond to stimuli.

NISHANTH · Answer

A rock rolling down a hill

NISHANTH · Answer

Water evaporating from a puddle

NISHANTH · Answer

The correct Option is "Phototropism in a sunflower"

NISHANTH · Answer

Salt dissolving in water

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