Dear Roshan,

You can download an app named NCERT books from google play store on your phone. Which will let you download the updated Biology book along with, giving you an option to download other NCERT books. I'm providing you the link to know about the app and also you can see screenshots their:

https://flic.kr/p/2gktn3W

https://flic.kr/p/2gktwEy

https://flic.kr/p/2gktQER

https://flic.kr/p/2gktQHM