Explanation : Genetics or the science of heredity is a discipline contributing specific details of the impact of heredity on living beings. Appearance like skin, hair texture and colour, eye shape and colour, nose shape, ear shape, head shape arc influenced by heredity.
Explanation : 'Basal' age is the mental age level at which all the items on an intelligence test can be creditably passed. In other word, it represents the highest level on a test standardised in units corresponding to mental age or age equivalents, below which it can be assumed that all items would be answered correctly.
Explanation : A child when scolded in class by a teacher returns horne and shows anger to his/her is a classic example of a defense mechanism called displacement.