If '+' means '-', ' X ' means '+', '-' means '÷' and

Read each sentence to find out whether there is any grammatical error in it. Mark the part with the error as your answer. 

spiny-skinned invertebrates that are found on the ocean floor

Find the appropriate answer.

An unexpected piece of good fortune  

Choose the one which best expresses the meaning of the given word .

Fleeting

Choose the word which is opposite in meaning to the word - Congenial

He is very humble about his achievements.

Choose the option that is an antonym of the word in capitals.

 The boy is PUNISHED and so cannot go out to play with his friends.

In the following question, four words have been given out of which one word is incorrectly spelt. Select the incorrectly spelt word.