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Plant And Animal Tissues Class 7 ICSE Biology | Selina Chapter 1 | Kinds of Plant Tissues #1

LearnoHub - Class 6,7,8・46 minutes read

The text discusses the structure and function of plant tissues, including meristematic tissues for growth and permanent tissues for specialization and support, such as parenchyma, collenchyma, and sclerenchyma. These tissues play vital roles in plant growth and development, with xylem conducting water and phloem transporting food bidirectionally to ensure proper nourishment for plant growth.

Insights

  • Cells are the fundamental units of life, dividing and grouping to form tissues, which then create organs and organ systems, showcasing a hierarchical organization in living organisms.
  • Plant tissues are categorized into meristematic tissues for active division and permanent tissues for specialized functions, with supportive tissues like sclerenchyma providing structural strength and rigidity to keep the plant upright, emphasizing the importance of tissue differentiation in plant growth and development.

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Recent questions

  • What are the main types of plant tissues?

    Meristematic and permanent tissues.

  • How do meristematic tissues differ from permanent tissues?

    Meristematic tissues actively divide, while permanent tissues are specialized.

  • What is the function of supportive tissues in plants?

    Supportive tissues provide strength and protection.

  • What is the role of phloem tissue in plants?

    Phloem tissue transports food bidirectionally.

  • What are the components of xylem tissue in plants?

    Tracheids, vessels, parenchyma, and fibers.

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Summary

00:00

"Cell Structure and Tissues in Biology"

  • Learning platform at learn.com offers free study materials for Physics, Chemistry, Maths, Biology, and SST.
  • Starting with ICSC Biology, the first chapter is Plant and Animal Tissues.
  • A cell is the smallest structure of living organisms where life begins.
  • Plant and animal cells differ in the presence of a cell wall and chloroplasts.
  • Cells are the structural and functional units of life, starting from a single cell.
  • Cells divide and group to form tissues, which then form organs and organ systems.
  • Tissues are groups of cells with similar structures and functions.
  • Skin, muscle, and blood are examples of tissues with specific functions.
  • The chapter discusses plant tissues, including meristematic tissues for rapid cell division.
  • Meristematic tissues are found in shoot and root tips, aiding in plant growth and lengthening.

18:20

Plant Tissues: Meristematic and Permanent Functions

  • Meristematic tissues are characterized by small cells with thin cell walls to facilitate active division.
  • The nucleus is the first to divide in a cell, followed by the cell itself, requiring a thin cell wall for efficient division.
  • Meristematic cells lack vacuoles as they do not need to store food, focusing on rapid division.
  • The nucleus in meristematic tissues is large and clearly visible, aiding in the active division process.
  • Permanent tissues, unlike meristematic tissues, do not divide and become specialized for specific functions.
  • Permanent tissues make up the bulk of the plant body and are crucial for growth and maturity.
  • Simple permanent tissues are classified into protective tissues and supportive tissues, with the latter providing protection and support to the plant.
  • Protective tissues have thick walls and are found on the surfaces of leaves, stems, and roots to safeguard internal structures.
  • Supportive tissues like parenchyma, collenchyma, and sclerenchyma provide support and strength to different parts of the plant.
  • Sclerenchymatous cells are dead cells that offer strength to plant parts, emphasizing their role in providing structural support.

35:59

Plant Tissues and Functions Explained

  • Parenchyma and sclerenchymatous colon cells are spherical and long narrow, respectively.
  • Parenchyma cells have thin and clear walls, while sclerenchymatous colon cells have thick cell walls.
  • Intercellular spaces are present in parenchyma cells but absent in both chyme and sclerenchymatous colon cells.
  • Parenchyma and colon chyme tissues consist of living cells, while sclerenchymatous tissue has dead cells.
  • Parenchyma is found throughout the plant, colon chyme in veins and veinlets, and sclerenchyma in wood or bark.
  • Parenchyma functions in storage, photosynthesis, respiration, and buoyancy in aquatic plants.
  • Colon chyme provides flexibility and mechanical support to the plant.
  • Sclerenchyma offers rigidity and mechanical support to keep the plant upright.
  • Xylem conducts water and minerals unidirectionally, while phloem conducts food bidirectionally.
  • Xylem consists of tracheids, vessels, xylem parenchyma, and xylem fibers, while phloem comprises sieve tubes, companion cells, phloem parenchyma, and phloem fibers.

54:20

Plant Growth: Nutrients, Signals, and Tissues

  • Plants require adequate food and proper nutrients for growth, similar to a baby needing nourishment to grow.
  • Buds, growing tips, roots, and shoots in plants signal the phloem tissue for food, which is then transported to the required areas.
  • Phloem tissue moves food based on signals, ensuring it reaches the necessary parts for growth.
  • Living cells are essential in tissues to receive signals and facilitate the movement of food in plants.
  • Plant tissues are classified into meristematic tissues and permanent tissues, with the former being actively dividing cells found in growing tips.
  • Permanent tissues include simple permanent tissues like protective and supportive tissues, and complex tissues like xylem and phloem.
  • Xylem conducts water, while phloem conducts food, forming the vascular tissue in plants.
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