Question

43. Which of the following has a closed blood vascular system?

(a) Cockroach
(b) Hydra
(c) Sponge
(d) Earthworm

Answer 1

(d) Earthworm

Step-by-step explanation:

Closed blood vascular means that the worm's blood flows only in one direction and is contained within vessels. And there are three main vessels that supply the blood to organs within the earthworm : 1- the aortic arches, 2- dorsal blood vessels, and 3- ventral blood vessels.

Answer 2

EARTHWORM

(d) Earthworm has a closed blood vascular system.

A closed blood vascular system is a circulatory system in which the blood is enclosed in blood vessels and is circulated by a heart. The blood vessels transport oxygen and nutrients to the cells and remove waste products. This type of circulatory system is more efficient than an open circulatory system, in which the blood flows through the body cavity and does not have a dedicated network of vessels. Earthworms have a closed blood vascular system with a tubular, segmented body, which has a well-defined circulatory system consisting of a heart, blood vessels and capillaries. The blood vessels transport oxygen and nutrients throughout the body, which are essential for the earthworm's survival. Cockroaches, Hydra and Sponges do not have a closed blood vascular system.

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