*Board of Intermediate Education Karachi* *Zoology Part 1 Target Papers* *Examination 2025* Section B (Short-Answer Questions) Reasoning Questions: 1. Why are water molecules called amphoteric in nature? OR Why is antipyretic therapy used? 2. Why is the SA node called the pacemaker of the heart? OR Why do monosaccharides taste sweet while polysaccharides do not? 3. Why does blood flow faster in arteries? OR How does pH affect enzyme activity? 4. How are echinoderms related to chordates? OR Why is the left ventricle the thickest heart chamber? 5. Why is air a better respiratory medium than water? OR Why do capillaries have a single endothelial layer? 6. Why is blood pressure higher in arteries than in veins? OR Why is chitin stronger than cellulose? 7. How does the stomach protect itself from HCl? OR Why do fats provide more energy than carbohydrates? 8. Why are flatworms so called? OR Why does ice float on water?