Answer: Transpiration.
- A Transpiration
- B Photosynthesis
- C Osmosis
- D Respiration
Correct answer: A. Transpiration
Explanation: Transpiration is the evaporation of water from plant surfaces, mainly through stomata on leaves.
Water can travel through cell walls (apoplast) or cell-to-cell through the cytoplasm (symplast) - but the Casparian strip at the endodermis blocks the apoplast route entirely, forcing everything through a selectively permeable membrane (symplast) before it can enter the xylem.
Concept context
Water and mineral absorption, the ascent of sap, transpiration, and phloem transport via the pressure flow hypothesis.