Question

Separation of right side and left side of the heart is useful to keep oxygenated have different and deoxygenated blood from mixing. Various organisms types of heart.

(I) Fill in the blanks (i) to (iii) correctly according to the type of organisms and their evolution in terms of blood circulation:

Organisms	Number of chambers in heart	Type of blood being circulated	Type of circulation
Fish	(i) ______	Mixed	Single
(ii) ______	3-chambered	Mixed	Incomplete double circulation
Birds and Mammals	4-chambered	Separated circulation path of oxygenated and deoxygenated blood	(iii) ______

(II) Which type of circulation is most efficient?

Answer 1

(I)

Organisms	Number of chambers in heart	Type of blood being circulated	Type of circulation
Fish	(i) Two-chambered	Mixed	Single
(ii) Amphibians/Reptiles	3-chambered	Mixed	Incomplete double circulation
Birds and Mammals	4-chambered	Separated circulation path of oxygenated and deoxygenated blood	(iii) Complete double circulation

(II) Complete double circulation is the most efficient type of circulation because it completely separates oxygenated and deoxygenated blood.