Lecture Notes: Class 9 Science - Fundamental Unit of Life (Biology - Lecture 1)

Introduction

• The lecture is focused on making science interesting and easy.
• Covers Class 9 science chapters in one-shot videos, aligning with NCERT.
• Delivered by Prashant Bhaiya, known for his engaging teaching style.

Class Structure and Notes

• One-shot session covering every line of NCERT.
• Notes and slides available in the description and Telegram channel.
• Emphasis on making science fun and less boring.
• Rough notebook recommended for noting key points during lectures.

Fundamental Unit of Life

Introduction to Cells

• Cell: Basic unit of life. All living organisms are made up from cells.
• Importance:
  • Non-living things are made up of atoms, while living things are made up of cells.
• Structure: Cells make tissues, tissues make organs, organs make organ systems, which together form an organism.
• Reasoning: Cells are the fundamental unit of life as all living beings originate from cells.

Discovery of Cells

• Robert Hooke: Discovered cells in a dead plant material (cork) using a microscope.
• Anton van Leeuwenhoek: First to observe living cells under a microscope.
• Robert Brown: Discovered the nucleus in cells.
• Purkinje: Coined the term "protoplasm"