This teaching-learning material was developed by Kusuma Foundation with support from subject experts to be used by secondary school students, teachers, and teacher educators in Uttar Pradesh. It draws from existing curricula and education materials, and was finalized after review by the State Resource Group set up by the Uttar Pradesh Madhyamik Shiksha Abhiyan. The material may be reproduced for educational purposes with permission from Kusuma Foundation. Kusuma Foundation works to facilitate access to education and aims to help children realize their potential through improving education outcomes and addressing barriers in education.