Chapter 5: The Fundamental Unit of Life – NCERT Exemplar Solutions for Class 9 Science
This chapter introduces students to the cell, the structural and functional unit of life. It begins with the discovery of the cell by Robert Hooke and progresses to modern cell theory. Students explore the differences between prokaryotic and eukaryotic cells, as well as plant and animal cells.
The chapter explains essential cell organelles such as the plasma membrane, nucleus, mitochondria, endoplasmic reticulum, Golgi apparatus, lysosomes, plastids, and vacuoles. The importance of each organelle in performing specific functions like energy production, protein synthesis, packaging, and digestion is emphasized. Processes like diffusion, osmosis, and active transport are also discussed to show how substances move in and out of cells. NCERT Solutions for Class 9 Science provide detailed answers to exercise questions, helping students grasp the role of different organelles. Meanwhile, NCERT Exemplar Solutions for Class 9 Science challenge learners with diagram-based and application-oriented questions. This ensures that students not only memorize functions but also apply the concepts in practical scenarios.