Question

Substances which can be moved through diffusion in plants are

• A. Ions
• B. Sugar
• C. Urea
• D. All of the above
  

Answer 1

Answer: (D)

All of the above

Diffusion may be defined as the process of movement of gases. liquids or solutes from the region of higher concentration to the regions of lower concentration till the molecules are uniformly distributed throughout the available space dissolved sugars and ions of potassium and sodium can pass through cell surface membranes by diffusion. Waste products such as urea also pass out of the cell through its membrane by cell diffusion helps in exchange of gases during respiration and photosynthesis. It is also responsible for transpiration.

So, the correct answer is D.