Question

a) Define transpiration stream.
b) Write three points of difference between transpiration and perspiration. [5 MARKS]

Answer 1

a) 2 Marks
b) 3 Marks

a) It is defined as the path of movement of mineral sap through the vessels and tracheids of xylem tissue due to transpiration.

b) i) Transpiration occurs in plants whereas perspiration occurs in animals.
ii) Transpiration takes place from the exposed surfaces of the plants whereas perspiration takes place through the skin.
iii) In transpiration, only water vapour is removed whereas, in perspiration, sweat containing urea, uric acid and some salts is removed.