Transpiration is

  1. evaporation of water from mesophyll cell walls and diffusion of vapour out through stomata
  2. uptake of water by root hairs
  3. active transport of ions
  4. movement of sucrose in phloem
Answer

A) evaporation of water from mesophyll cell walls and diffusion of vapour out through stomata

Definition of transpiration. AS & A Level Biology · Topic 7 Transport in Plants · 7.2 Transport mechanisms

Biology MCQ · More A Level Biology: Transport in plants MCQs · Practise