Answer: transpiration.
- A transpiration
- B respiration
- C photosynthesis
- D digestion
Correct answer: A. transpiration
Explanation: Transpiration is water loss, mostly through the stomata of 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.