Here are brief answers to the questions:
1. Consumer Behavior refers to the selection, purchase and consumption of products/services by individuals, groups or organizations and the processes involved in these activities.
2. Individual determinants include psychological factors like motivation, perception, learning, attitudes, personality etc. Environmental influences include cultural, social, personal and economic factors.
3. Yes, Consumer Behavior is interdisciplinary as it draws from psychology, sociology, anthropology and economics.
4. The basic components in consumption behavior are cognition, affect and behavior.
5. The various buying roles include initiator, influencer, decider, purchaser and user.
6. The key disciplines that have contributed are psychology