This is a very tricky question, as there are many types of biometric technologies that use different markers, have different error thresholds, and are deployed in different contexts. And, this is not going into multi-modal biometrics or second-generation systems. I delivered classes on biometrics a few years ago and students tended to rely on this report as a good, practical and clear guide:

http://irishpatients.ie/news/wp-content/uploads/2012/04/Irish-Council-Bioethics-Final_Biometrics_Doc_HighRes.pdf

Hope it helps 

If biometric is merged with any other cryptographic algorithm, then the system will be more secure.

Which Cryptographic algorithm is suitable for the protection of the system? especially for Biometric Passport?

Consider for the guidance of the privacy and data protection aspect the "Privacy by design" approach. You find a usefull summary at: https://www.enisa.europa.eu/topics/data-protection/privacy-by-design

For validation you do a Privacy Impact Assessment (PIA).

Thank you so much alper kanak for the information shared.

God bless you