Concept:Capillary action is the spontaneous flow of liquid into a narrow tube or porous material due to strong adhesive forces overcoming cohesive forces and gravity.
Formula:Not applicable.
Solution:- Plants utilize capillary action in their xylem to help pull water up from the soil.
- Cotton towels and blotting paper consist of millions of microscopic cellulose fibers that create tiny, narrow channels perfectly suited to aggressively wick liquids via capillary action.
- However, the macroscopic movement of blood through human veins is driven mechanically. It relies on the immense pumping pressure generated by the heart, the squeezing action of skeletal muscles, and one-way physical valves preventing backflow. It is a hydraulic system, not a passive capillary pull.
Why other options are incorrect:Options A, B, and D are all classic textbook examples of passive capillary mechanics acting through tiny, porous networks.
Quality & Fidelity Assurance:
Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.