| (i) Organ systems in different group of animals show various patterns of complexities. |
| (ii) The digestive system in Platyhelminthes has only a single opening to the outside of the body that serve as both mouth and anus, and is hence called complete. |
| (iii) In open type of circulatory system, the blood is pumped out of the heart and the cells and tissues are directly bathed in it. |
| (iv) In closed circulatory type, the blood is circulated through a series of vessels of varying diameters (arteries, veins and capillaries). |
A) Only (i)
B) Both (ii) and (iii)
C) (i), (iii) and (iv)
D) All of these
Correct Answer: C
Solution :
[c] The digestive system of platyhelminthes is incomplete. A complete digestive system has two openings, mouth and anus.
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