Theory:

     Kari was like a baby. He had to be trained to be good and if you did not tell him when he was naughty, he was up to more mischief than ever.
 
     For instance, one day, somebody gave him some bananas to eat. Very soon he developed a great love for ripe bananas. We used to keep large plates of fruit on a table near a window in the dining-room. One day all the bananas on that table disappeared and my family blamed the servants for eating all the fruit in the house. A few days later the fruit disappeared again; this time the blame was put on me, and I knew I had not done it. It made me very angry with my parents and the servants, for I was sure they had taken all the fruit. The next time the fruit disappeared, I found a banana all smashed up in Kari’s pavilion. This surprised me very much, for I had never seen fruit there and, as you know, he had always lived on twigs.
Explanation:
 
The narrator was comparing Kari like a baby. He had been trained to be good. One must tell him when he was naughty, or else he would be behaving more mischievous than ever.
 
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Naughty and mischievous Kari
 
Kari was fond of bananas. On a fine day, someone gave him a bunch of ripe bananas to eat. He liked it very much. From that day onwards, he had a great love for bananas.
 
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Kari was fond of bananas
 
The narrator's family used to keep large plates of fruit on a table near a window in the dining-room.
 
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Fruits on narrator's dining-table
 
One day, all the bananas from the table got vanished, and his family members blindly blamed the servants for eating all the fruit in the house. After a few days, he noticed the same thing happened again. This time they accused him, and he knew that he had not done that. Finally, he became very angry with his parents and servants for accusing him. The next day, the narrator found all the bananas were destroyed and scattered in Kari's pavilion. He was astonished because he had never seen any fruit in the pavilion before except the leaves and twigs.
 
Meanings of the difficult words:
 
S.No
Words
Meanings
1
Mischievous
Liking to behave badly and embarrassing or annoying people
2
Disappeared
Vanished
3
Fond
Liking to eat or do something
4
Smashed
To break something, or to be broken violently and noisily into many pieces
5
Naughty
Badly behaved; not obeying
6
Astonished
Surprised
Reference:
National Council of Educational Research and Training (2007). Bringing up Kari- Dhan Gopal Mukherji(7-14). Published at the Publication Division by the Secretary, National Council of Educational Research and Training, Sri Aurobindo Marg, New Delhi.