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Tissues And Other Levels Of Organization

NIOS · Class 12 · Biology

Quick revision notes for Tissues And Other Levels Of Organization — NIOS Class 12 Biology. Key concepts, formulas, and definitions for last-minute revision.

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Key Topics to Revise

1

1. Definition and Basic Concepts of Tissues

  • A tissue is a group of cells with common origin, similar structure, and the same function
  • Cells in a tissue are derived from the same embryonic layer, ensuring structural similarity
  • The study of tissues is called histology
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2. Plant Tissues - Classification

  • Plant tissues are divided into two main categories: Meristematic and Permanent
  • Meristematic tissues contain dividing, undifferentiated cells
  • Permanent tissues have stopped dividing and are differentiated
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3. Meristematic Tissues

  • Meristematic tissues are composed of immature, undifferentiated cells
  • Cells are living, thin-walled with abundant cytoplasm and prominent nuclei
  • Vacuoles are small or absent in meristematic cells
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4. Simple Permanent Plant Tissues

  • Three main types of simple tissues: Parenchyma, Collenchyma, Sclerenchyma
  • Parenchyma cells are living, thin-walled, with prominent intercellular spaces
  • Parenchyma functions in storage, photosynthesis, and giving rigidity through turgor pressure

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Key Concepts

A tissue is a groupMeristematic tissues consist of immatureSimple permanent tissues are composedComplex tissues contain multiple cell typesThis theory explains vegetative shoot apex

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