The correct option is (iii). Epithelial tissues are thin to allow rapid exchange of gases, nutrients and wastes across them. Their thin structure supports efficient absorption, secretion and diffusion in organs like lungs, intestines and blood vessels.
Why are the epithelial tissues that line an animal’s internal organs usually only one or a few cells thick? (i) To store food efficiently. (ii) To provide maximum strength. (iii) To allow quick exchange of materials across them. (iv) To reduce friction.
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The correct answer is (iii) to allow quick exchange of materials across them. Epithelial tissues lining organs like lungs and intestines are usually very thin so that gases, nutrients and wastes can diffuse rapidly. This thin structure increases efficiency in absorption, secretion and exchange processes, helping organs perform important physiological functions smoothly and effectively within the body.
For more NCERT Solutions of Class 9 Science Exploration Chapter 3 Tissues in Action Question Answer (2026-27)
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