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Why can insects move on the surface of water without sinking?

  1. Due to dynamic lift
  2. Due to the viscosity of water 
  3. Due to the surface tension of water
  4. Due to the buoyant force

Answer (Detailed Solution Below)

Option 3 : Due to the surface tension of water
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Detailed Solution

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CONCEPT:

  • Surface tension: The property by virtue of which liquid tries to minimize its free surface area is called surface tension.
    • It is denoted by S or T.

Surface tension is given by:

S or T = F/L

where F is force and L is the length of contact.

EXPLANATION:

  • The insect can move on the surface of water due to the surface tension of water. So option 3 is correct.
  • The weight of the insect and structure of their feet in combination with the surface tension of water allows some insects to walk on water.
  • Here the weight is balanced by the surface tension force.
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