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STD 11 - 8. Cell the unit of life — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 8. Cell the unit of life1 Mark
MCQ
In which method of transport, plasma membrane does not require carrier molecule?
  • A
    Active transport
  • B
    Facilitated diffusion
  • ✓
    Simple diffusion
  • D
    $Na ^+- K ^+$ pump
✓

Answer

Correct option: C.
Simple diffusion
c
Simple diffusion is a process in which plasma membrane does not require any carrier molecule to pass small non- charged molecules or lipid soluble molecules between the phospholipids to enter or leave the cell. The particles move from areas of high concentration to areas of low concentration (they move down their concentration gradient). Oxygen and carbon dioxide and most lipids enter and leave cells by simple diffusion.

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