Find the odd one out based on the process of excretion or waste removal:

Find the odd one out based on the process of excretion or waste removal:
  1. Fallen leaves of a deciduous tree in autumn
  2. Steam rising from a kettle of boiling water
  3. Sweat secreted on a dog's paw pads
  4. Resin oozing out from a pine tree trunk

Solution

Steam from boiling water is a non-living physical process of evaporation, whereas shedding leaves, sweating, and oozing resin are biological waste removal processes in living things.

Asked in: Homi Bhabha Practice

Practice more The Living World questions on Aicharya