CH 1 ORGANISATION IN LIVING THINGS ICSE BOARD BIOLOGY CLASS 7

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Living things are defined as entities that can breathe, move, and live life, categorized into plant and animal tissues such as meristematic, simple permanent, complex permanent, epithelial, connective, muscular, and nerve tissues. Tissues are groups of cells performing the same function, forming organs, which then create systems and organisms, showcasing the levels of organization in living entities.

Insights

  • Living things are categorized into plant and animal tissues based on their ability to breathe, move, and sustain life. Plants have meristematic and permanent tissues, while animals possess epithelial, connective, muscular, and nerve tissues, showcasing distinct characteristics and functions.
  • Tissues in living organisms are crucial for organization, forming organs that create systems and complete organisms. Meristematic tissues in plants, such as apical and lateral meristems, play a vital role in growth and healing by continuously dividing to produce new cells and support the development of leaves, roots, and flowers.

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Recent questions

  • What are the two main types of tissues in plants?

    Meristematic and permanent tissues.

  • How are living things categorized in biology?

    Into plant and animal tissues.

  • What is the role of meristematic tissues in plant growth?

    Continuous division for new cell formation.

  • What are the levels of organization in living entities?

    Cells, tissues, organs, systems, organisms.

  • How do plant and animal tissues differ in composition?

    Plant tissues include dead cells like sclerenchyma.

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Summary

00:00

Organization and Living Things in Biology

  • Chapter 1 of biology for class 7 is about Organization and Living Things, focusing on the definition and classification of tissues in plants and animals.
  • Living things are defined as entities that can breathe, move, and live life, categorized into plant and animal tissues such as meristematic, simple permanent, complex permanent, epithelial, connective, muscular, and nerve tissues.
  • Organizations are composed of cells, with single-celled and multicellular organisms existing, the latter comprising millions of cells specialized for specific functions.
  • Tissues are groups of cells performing the same function, forming organs, which then create systems and organisms, showcasing the levels of organization in living entities.
  • Plant tissues are divided into meristematic and permanent tissues based on their dividing capacity, with meristematic tissues aiding in growth and found in growing regions of plants.
  • Meristematic tissues consist of apical, lateral, and intercalary types, with apical meristems located at the growing tips of stems and roots, lateral meristems in vascular bundles, and intercalary meristems at the base of leaves or internodes.
  • Plants are autotrophic, stationary organisms with supportive tissues like sclerenchyma providing structural strength, while animals are heterotrophic, requiring more energy and having living tissues.
  • Animal tissues predominantly consist of living cells, contrasting with plant tissues that include dead cells like sclerenchyma.

18:03

Meristematic tissues: vital for plant growth and repair.

  • Living tissues contain living protoplasm, while dead tissues lack it. Meristematic tissues play crucial roles in growth, continuously dividing to form new cells that lead to the development of new leaves, branches, roots, flowers, and fruits. Additionally, meristematic tissues aid in healing plant injuries by producing new cells to cover the damaged area.
  • Meristematic tissues are divided into apical and lateral meristems, with the apical meristem located at the root tips and the lateral meristem found in the cork and vascular bundles. These tissues are essential for plant growth and development, continuously dividing to support the formation of new cells and various plant structures.
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