The Question is from neet-botany plant-growth-and-development , and it was created by the author B VENKAT

Question

Which of the following best explains why auxin can be used to create weed-free lawns without harming the grass?

B VENKAT · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Differential sensitivity of monocots and dicots to auxin
 **Related Topics**: Plant hormones, selective herbicides, weed control
 **Prerequisites**: Basic understanding of plant hormones and their effects on plant growth.
## SOLUTION PATHWAY
**Given Information**:
  Auxin is used to create weed-free lawns without harming grass.
**Method & Steps**:
 1. Identify the main difference between grass and weeds in terms of their response to auxin.
  Reasoning: Grasses (monocots) are less sensitive to auxin than weeds (mostly dicots).
  Formula/Rule: N/A
 2. Explain the reason for the differential response.
  Working: Dicots are generally more sensitive to auxin's growth-regulating effects. High concentrations of auxin can lead to abnormal growth and eventually death in dicots.
  Key Point:  This differential sensitivity allows for selective weed control.
 3. Determine the best explanation.
  Result: The differential sensitivity to auxin in monocots and dicots explains the selective action of auxin as a herbicide.
  Verification: This aligns with the observed effect of auxin on lawns.
 ## OPTION ANALYSIS
A :x: Grasses absorb auxin more slowly than weeds: While there might be some differences in absorption rates, the primary reason is sensitivity, not absorption speed.
B :x: Auxin promotes grass growth while inhibiting weed growth: Incorrect; auxin doesn't typically promote grass growth.
C ✓: Differential sensitivity to auxin in monocots and dicots: This accurately explains the selective action of auxin.
D :x: Grasses metabolize auxin more efficiently than weeds: While metabolism plays a role, the primary factor is the difference in sensitivity.
 ## LEARNING AIDS
 **Common Mistakes**:
  1. Focusing solely on absorption or metabolism: While these factors play a role, the primary reason is the difference in sensitivity to auxin.
  2. Oversimplifying the process: The interaction between auxin and plants is complex, involving multiple pathways and mechanisms.
 **Quick Tips**:
  1. Remember the key difference: Dicots are more sensitive to auxin than monocots.
  2. Focus on the selective effect: Auxin-based herbicides exploit this difference to target weeds selectively.

B VENKAT · Answer

Grasses absorb auxin more slowly than weeds

B VENKAT · Answer

Auxin promotes grass growth while inhibiting weed growth

B VENKAT · Answer

The correct Option is "Differential sensitivity to auxin in monocots and dicots"

B VENKAT · Answer

Grasses metabolize auxin more efficiently than weeds

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