Which of the following statements is correct regarding diffusion:
  • Diffusion of solids rather than diffusion in solids is more likely.
  • The diffusion rate depends upon the size of the substances; smaller substances diffuse slower
  • Diffusion is dependent on a living system
  • Movement by diffusion is passive and no energy expenditure takes place in the process
Which one of the following is essential for the process of imbibition to take place?
I. Water potential gradient between the adsorbent and the liquid imbibed
II. Affinity between the absorbent and the liquid
III. Affinity between the adsorbent and the liquid
IV. Water potential gradient between the absorbent and the liquid imbibed
  • Only III and IV
  • Only I and II
  • Only I and III
  • Only II and IV
Xylem is associated with the translocation of:
  • a variety of organic and inorganic solutes
  • water and a variety of organic and inorganic solutes
  • water, mineral salts, some organic phosphorus and hormones
  • water, mineral salts, some organic nitrogen and hormones
What could be considered as the most significant contribution of root pressure in the process of water transport?
  • It provides a push which plays a major role in movement of water up the trees
  • It re-establishes the continuous chain of water molecules in the xylem which often breaks under the enormous tension created by transpiration
  • It helps in active transport of various ions into the vascular tissues of the root from the soil
  • It helps in loss of excess water in its liquid phase (guttation)
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