AIIMS 2018 Botany Synthetic Phytohormones MCQ Question

Option B is correct because it includes synthetic phytohormones such as 2,4-D (2,4-dichlorophenoxyacetic acid), NAA (naphthaleneacetic acid), and BAP (benzylaminopurine), all of which are artificially synthesized and used in plant growth regulation. In contrast, option A contains IBA (indole-3-butyric acid) and IAA (indole-3-acetic acid), which are naturally occurring auxins, making them not synthetic. Option C includes Zeatin, a naturally occurring cytokinin, while option D contains IAA, which is also a natural hormone, thus excluding them from being classified as synthetic. Understanding the distinction between synthetic and natural phytohormones is crucial for applications in agriculture and plant biotechnology.