Why did Pranjol’s father, Mr Barua say to Rajvir that he had done his homework?

Why did Pranjol’s father, Mr Barua say to Rajvir that he had done his homework?

Answer: Pranjol’s parents picked Rajvir and Pranjol from the station. While travelling through the Dhekiabari Tea Estate, on seeing a tractor, pulling a trailor – load of tea leaves, Rajvir confirmed with Mr Barua if that was the second – flush or sprouting period. Mr Barua replied affirmatively and was quite surprised by his knowledge of tea. Therefore, Pranjol’s father said that Rajvir had done his homework.