Chapter 1 The Science of Biology Notes - Class 9 Biology Punjab Board

This page provides Class 9 Biology Chapter 1, The Science of Biology, notes for Punjab Board students following the PCTB syllabus for the 2026-2027 session. It includes solved exercises, important MCQs, and short and long questions, and can be read online chapter by chapter by SSC Part 1 and Matric Part 1 students.

Chapter 1 of Class 9 Biology, The Science of Biology, introduces students to biology as a scientific field and explains how it connects with other branches of science. The chapter covers the major branches of biology, the range of careers available in biological sciences, and how biological knowledge relates to subjects like chemistry, physics and Islamic teachings on studying life.

A significant part of this chapter focuses on the scientific method, including how a hypothesis is formed, tested and either supported or rejected, and the difference between a scientific theory and a law or principle. The chapter uses malaria as a practical example to show how the scientific method is applied step by step in real biological research.

This chapter matters for Punjab Board exams because it builds the conceptual foundation used throughout the rest of the Class 9 Biology course, and Punjab Board papers often include short questions on the scientific method and the branches of biology from this chapter. These solved notes are organized to help students understand each concept clearly and prepare efficiently for their exams.