Who are secretors? Where can antigenic substances detected in them?

Assertion : ELISA test is based on antigen-antibody interactions where a pathogen can be detected by the presence of antibodies (proteins,glycoproteins, etc) on it Reason : The pathogen antibody to be identified is immobilised on the surface of specially constructed ELISA plates and is then tested.

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How can a change occur in a substance?

Wat are bacteriophages ? Where can we find it ?

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Assertion : The sound of heart beats, heart valve functions can be detected by a stethoscope . Reason : Stethoscopes are high precisioned Instruments.

Asseration :The sound of heart beats, heart value functions can be detected by a sethoscope. Reasons: Stheoscope are high prescisioned Instruments.

Can we perform Young's double slit experiment with sound waves? To get a reasonable fringe pattern what should be the order of separation between the slits? How can the bright fringes an the dark fringes be detected in this case?

Which type of bonds are developed between an antigen and antibody?Name them.