9th Class Biology Notes Chapter 7 MCQs PDF - Enzymes

These are the multiple choice questions for Unit 7, Enzymes, from the new 9th class Biology book followed by the Punjab boards. Exercise MCQs first, then additional ones under headings such as mechanism of enzyme action and factors affecting enzyme activity, with the answer key at the end.

• Class: 9th (Matric Part 1)
• Subject: Biology, English Medium
• Unit 7: Enzymes
• Question type: Multiple choice questions
• Total MCQs: 30, followed by an answer key table
• Syllabus: New PECTAA syllabus for Punjab Boards, sessions 2025-26 and 2026-27
• Format: PDF, ready to read or print

Topics the questions are drawn from:

• Enzymes as catalysts, and what stays unchanged in a biochemical reaction
• The lock and key model and what it says about the active site
• How temperature affects reaction rate, read off the graphs
• How a change in pH alters the active site, and the optimum pH of pepsin
• Denaturation, and what happens past the optimum temperature

Download the PDF from taleem360.com and keep it on your phone for quick revision before the test.