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Cell The Unit of Life — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYCell The Unit of Life1 Mark
MCQ
What is a tonoplast?
  • A
    Outer membrane of mitochondria.
  • B
    Inner membrane of chloroplast.
  • ✓
    Membrane boundary of the vacuole of plant cells.
  • D
    Cell membrane of a plant cell.
✓

Answer

Correct option: C.
Membrane boundary of the vacuole of plant cells.
Tonoplast In plant cell the vacuole in bound by a single membrane called tonoplast.
The tonoplast facilitates the transport of ions and other material against the concentration gradient into the vacuole.
Hence, their concentration is higher in the vacuole than in the cytoplasm.
The outer membrane of mitochondria is formed of porin proteins and inner membrane bounds of chloroplast the stroma the cell membrane of the plant cell is not a tonoplast.
It is 'simple biological/unit membrane present in every cellular organism.

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