Work and energy

Look at the activities listed below. Reason out whether or
not work is done in the light of your understanding of the
term ‘work’.
• Suma is swimming in a pond.
• A donkey is carrying a load on its back.
• A wind-mill is lifting water from a well.
• A green plant is carrying out photosynthesis.

• Food grains are getting dried in the sun.
• A sailboat is moving due to wind energy.
• An engine is pulling a train.