Intelligence — Psychology STD 12 Commerce / Arts — Question

Intelligence is the highest attribute of human beings. Different psychologists have defined intelligence differently. Lewis Terman explains intelligence as, “An ability to think on an abstract level.” David Wechsler defines intelligence as, ‘The aggregate or global capacity of an individual to act purposefully, to think rationally and to deal effectively with his environment.”
The two main perspectives on intelligence are-

1. Intelligence as a single, general ability
2. Intelligence as a set of multiple abilities