Respiration in insects is called direct because (a) the cells exchange

1.	Respiration in insects is called direct because (a) the cells exchange O2/CO2 directly with the air in the tubes (b) the tissues exchange O2/CO2 directly with the air in the tubes (c) the tissues exchange O2/CO2 directly with the air outside through body surface (d) tracheal tubes exchange O2/CO2 directly with the haemocoel which then exchange with tissues
Answer» Respiration in insects is called direct because (a) the cells exchange $O_{2} / C O_{2}$ directly with the air in the tubes (b) the tissues exchange $O_{2} / C O_{2}$ directly with the air in the tubes (c) the tissues exchange $O_{2} / C O_{2}$ directly with the air outside through body surface (d) tracheal tubes exchange $O_{2} / C O_{2}$ directly with the haemocoel which then exchange with tissues

Respiration in insects is called direct because (a) the cells exchange O2/CO2 directly with the air in the tubes (b) the tissues exchange O2/CO2 directly with the air in the tubes (c) the tissues exchange O2/CO2 directly with the air outside through body surface (d) tracheal tubes exchange O2/CO2 directly with the haemocoel which then exchange with tissues

Answer»

Respiration in insects is called direct because

(a) the cells exchange $O_{2} / C O_{2}$ directly with the air in the tubes

(b) the tissues exchange $O_{2} / C O_{2}$ directly with the air in the tubes

(d) tracheal tubes exchange $O_{2} / C O_{2}$ directly with the haemocoel which then exchange with tissues