30. Which of the following is predominantly a heredity related factor ?
( 1 ) Attitude towards the peer group
( 2 ) Thinking pattern
( 3 ) Colour of eyes
( 4 ) Participation in social activities
Ans- (3 ) Colour of eyes
Reason:- Generally, the color of the eyes is predominantly a heredity-related factor. Biological heredity is transferred by genes and chromosomes, going down from one generation to another. This means a child receives his/her parents traits or features an natural gifts.