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  • ICAR and TNAU E-Course Summarized

    Summarized Notes
  • What is not present in the plant cell?

    Question: What is not present in the plant cell?

    Options:

    Cell membrane
    Vacuole
    Chloroplast
    Centrioles

    🔑 Key Points
    Centriole:
    → A centriole is a microtubule-based structure that is part of the centrosome.
    → It helps arrange microtubules inside the cell.
    → A centriole is a primary unit responsible for creating and anchoring microtubules.
    → One centriole in a eukaryotic cell is perpendicular to a second centriole in the centrosome.
    → Microtubules extend from each centriole, using each centriole as an anchor for the microtubule's base.
    → Centrioles are present in animal cells but absent in plant cells.

    📝 Additional Information
    → Cell Membrane:
    Within the cell wall lies a somewhat permeable membrane.
    A thin layer of protein and fat composes it.
    The cell membrane regulates the entrance and exit of certain chemicals.

    → Chloroplast:
    It is an organelle surrounded by a phospholipid membrane and is long.
    The chloroplast is disc-shaped.
    The stroma is the DNA-containing fluid inside the chloroplast.
    Each chloroplast contains the green pigment chlorophyll.

    → Vacuole:
    A plant cell has a big vacuole.
    Tonoplast is the membrane encompassing the central vacuole.
    The central vacuole plays a crucial role in maintaining turgor pressure on the cell wall.
    The central vacuole contains cellular sap, including salts, enzymes, and other components.

    → Golgi Apparatus:
    The Golgi apparatus is also known as the Golgi complex and the Golgi body.
    It is present in all eukaryotic cells, including plants and animals.
    They are membrane-bound organelles found in the cell's cytoplasm.

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