IB Grade-12 Biology | Theme A: Unity and Diversity by Prakhar Chauhan | Learn Smarter
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Theme A: Unity and Diversity

The chapter explores fundamental biological concepts, starting with the unique properties of water and nucleic acids that form the foundation of life. It examines cell origins, structure, and the behavior of viruses, emphasizing cellular organization and the classification of organisms. The discussion extends to evolutionary processes, significance of biodiversity, and conservation strategies essential for maintaining ecological balance.

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Sections

  • 1

    Molecules

    This section examines the significance of molecules, particularly focusing on water and nucleic acids, and their crucial roles in biological processes.

    Learning

  • 1.1

    Water

    Water is essential for life, known for its unique properties like polarity, high specific heat, solvent capabilities, and ice formation.

    Learning Practice

  • 1.2

    Nucleic Acids

    Nucleic acids, namely DNA and RNA, are crucial for storing and transmitting genetic information.

    Learning Practice

  • 2

    Cells

    This section explores the fundamental concepts of cells, including their origins, structure, and the role of viruses.

    Learning Practice

  • 2.1

    Origins Of Cells (Hl Only)

    This section explores the origins of cells, detailing theories such as abiogenesis, the RNA world hypothesis, and the endosymbiotic theory.

    Learning Practice

  • 2.2

    Cell Structure

    This section discusses the fundamental structures of cells, differentiating between prokaryotic and eukaryotic cells, and emphasizes the importance of cell membranes in cellular functions.

    Learning Practice

  • 2.3

    Viruses (Hl Only)

    Viruses are unique entities composed of genetic material encased in a protein coat, highlighting their distinct characteristics and modes of reproduction.

    Learning Practice

  • 3

    Organisms

    This section explores the diversity of organisms, their classification, and the significance of understanding biological diversity.

    Learning Practice

  • 3.1

    Diversity Of Organisms

    The diversity of life encompasses genetic, species, and ecosystem diversity, crucial for conservation and understanding evolution.

    Learning Practice

  • 3.2

    Classification And Cladistics (Hl Only)

    This section covers the classification of living organisms through taxonomy and cladistics, highlighting their shared characteristics and evolutionary relationships.

    Learning Practice

  • 4

    Ecosystems

    This section explores evolution, speciation, and the significance of biodiversity and its conservation.

    Learning Practice

  • 4.1

    Evolution And Speciation

    This section explores the mechanisms of evolution and the processes through which new species emerge.

    Learning Practice

  • 4.2

    Conservation Of Biodiversity

    Conservation of biodiversity is essential to maintaining ecosystem health and human well-being, addressing threats such as habitat destruction and climate change.

    Learning Practice

References

Untitled document (9).pdf

Class Notes

Memorization

What we have learnt

  • Water's unique properties a...
  • Nucleic acids are vital for...
  • Cells serve as the basic un...

Final Test

Revision Tests