Grade (12) Biology_Part (1)(Without WM) (24.5.2024)

CHAPTER 1: INTRODUCTION TO BIOLOGY

1.1 Themes of Biology

  • Biology addresses five major themes: organization, information, energy and matter, interactions, and evolution.

  • Each theme is critical to understanding life as a whole.

1.1.1 Theme 1: New Properties Emerge at Successive Levels of Biological Organization

  • structure and function are interrelated across biological hierarchy levels (e.g., cellular organization: biosphere, ecosystem, community, population, organism, organ system, organ, tissue, cell, organelle, molecule, atom).

  • Example: Hummingbird anatomy allows unique flight abilities and feeding.

1.1.2 Theme 2: Life’s Processes Involve the Expression and Transmission of Genetic Information

  • Genetic information is encoded in DNA.

  • DNA transmits heritable information and serves as instructions for protein synthesis (transcription to mRNA, then translation to proteins).

1.1.3 Theme 3: Life Requires the Transfer and Transformation of Energy and Matter

  • Energy flows through ecosystems; producers convert solar energy into chemical energy, which is passed to consumers.

  • Chemical cycling involves interactions between organisms and their environments.

1.1.4 Theme 4: Molecules to Ecosystems, Interactions in Biological Systems

  • Organisms continuously interact with physical factors (feedback regulation mechanisms).

  • Positive and negative feedback mechanisms regulate biological processes.

1.1.5 Theme 5: Evolution for the Unity and Diversity of Life

  • Evolution explains the diversification of life and adaptations to environments.

  • Classification systems categorize species (Domains: Bacteria, Archaea, Eukarya).

1.2 Importance of Biology in Daily Life

  • Biology impacts human society through agriculture, health, and environmental awareness.

1.2.1 Agriculture, Horticulture, and Hydroponic Culture

  • Agriculture produces food and fibers, crucial for sustenance.

  • Examples include major crops from Myanmar.

1.2.2 Aquaculture and Livestock

  • Aquaculture involves farming aquatic organisms under controlled conditions.

  • Livestock provides key nutritional resources and services.

1.2.3 Food

  • Essential for life; varies in nutritional value (carbohydrates, proteins, vitamins).

1.2.4 Health and Medicine

  • Biology enables the understanding of disease treatment and drug formulation (pharmacognosy).

1.2.5 Clothing and Shelter

  • Natural fibers (cotton, wool) derived from plants and animals are essential for clothing.