Incomplete cartilagenous rings are present upto_____

Two rings are present in

The casparian rings are present in

Balbiani rings are present in

All of following structure of the human respiratory system contains incomplete cartilaginous rings , except :

Assertion : Tracheae, primary, secondary and tertiary bronchi are supported by incomplete carilaginous rings. Reason : These rings of carilage make the wall non-collapsible.

Cartilagenous fish are grouped under____________.

Find out the correct match from the following :- (i) Larynx -sound box (ii) Trachea - complete cartilagenous rings (iii) Epiglottis -elastic cartilagenous flap (iv) Alveoli - very thin, irregular walled, non-vascularised bag like structured (v) Pleural fluid - reduces friction on the lung surface