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Standard VII
Chemistry
Diffusion
Question

Type of transport across the biomembrane without the help of proteins is
  1. Facilitated diffusion
  2. Active transport
  3. Simple diffusion
  4. Diffusion via symport

A
Facilitated diffusion
B
Simple diffusion
C
Diffusion via symport
D
Active transport
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Solution
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  • Simple diffusion can be defined as the process by which solutes particles are moved along the concentration gradient through the semipermeable membrane (cell membrane)
  • Eg- water, oxygen, carbon dioxide, ethanol and urea are transported by simple diffusion.
  • This type of transport does not require energy for the transport of molecules across the cell membrane.
  • So, the correct answer is 'Simple diffusion'.

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