The Pavlov dog story is about Ivan Pavlov's famous experiment. He noticed that dogs would salivate not only when presented with food but also when they saw the lab assistant who usually brought the food. Pavlov then conducted systematic experiments where he paired a neutral stimulus like a bell with the presentation of food. After repeated pairings, the dogs would salivate at the sound of the bell alone. This discovery was a huge contribution to the understanding of conditioned reflexes in psychology.
Ivan is probably the protagonist. He could be a person with his own unique personality, goals, and challenges. Maybe he is a child or a young adult. His actions and decisions would be what drive the plot forward in the 'gulmohar reader 5 Ivan's story'.
I'm sorry, but since I don't know the specific 'Ivan's story', I can't tell it in detail. Maybe Ivan is an ordinary person with his own unique experiences, like growing up in a small town, going to school, making friends, and facing various challenges in life.