NCERT Solutions for Class 7th Science 1234BackPage 4 of 4 Chapter 6. Physical and Chemical Changes topic -4 Exercise (NCERT Text Book) Chapter -1 Q1. – Why do organisms need to take food? 1234BackPage 4 of 4 Chapter Contents: 1. topic -1 2. NCERT Exercise 3. topic -3 4. topic -4 Academic Classes Sponsers Link Chapter List: Science 7th Chap. 1. Nutrition in Plants Chap. 2. Nutrition in Animals Chap. 3. Fibre to Fabric Chap. 4. Heat Chap. 5. Acids, Bases and Salts Chap. 6. Physical and Chemical Changes Chap. 7. Weather, Climate and Adaptations of Animals to Climate Chap. 8. Winds, Storms and Cyclones Chap. 9. Soil Chap. 10. Respiration in Organisms Chap. 11. Transportation in Animals and Plants Chap. 12. Reproduction in Plants Chap. 13. Motion and Time Chap. 14. Electric Current and its Effects Chap. 15. Light Chap. 16. Water : A Precious Resource Chap. 17. Forests: Our Lifeline Chap. 18. Wastewater Story Competitive & Entrance Exams: Courses For SSC-CGL Or Tier-I, II Courses For Banking P.O and Clerk Courses For Railway Courses For Delhi Police Courses for CRPF NDA Polytechnic Apurva Institute Our Branches 1. Head Office: 148 C, Sainik Enclave, Part -III, Mohan Garden New Delhi -110059 2. Branch Office & Working Office : 151 Sainik Enclave, Part -III, Mohan Garden New Delhi -110059.