Question

In Open Vascular system, the circulation fluid is known as
A Blood
B Perilymph
C Haemolymph
D Lymphatic Fluid

Answer 1

Hint: The open circulatory system includes sinuses filled with blood. The blood in the system does not include any respiratory pigment. Because of the absence of respiratory pigments, it has no colour. This type of colourless blood is called hemolymph.

Complete answer:
Option A- Blood is a body fluid present in humans as well as other animals that delivers necessary substances like nutrients and oxygen to the cells along with it also transports metabolic waste products away from those same cells.
Option B- Perilymph is an extracellular fluid present within the inner ear. It is found within the Scala tympani along with it in Scala vestibuli of the cochlea. The ionic composition of perilymph can be comparable to that of plasma as well as cerebrospinal fluid.
Option C- Haemolymph is a fluid, analogous to the blood present in vertebrates, that circulates in the interior of the arthropod body which remains in direct contact with the animal's tissues. It consists of a fluid plasma in which hemolymph cells are suspended.
Option D- The lymphatic system is an organ system in vertebrates that is part of the circulatory system along with the immune system. It is made up of a large network of lymphatic vessels, or organs, and lymphoid tissues. The vessels carry a clear fluid known as lymph towards the heart.

So, the correct answer to the question is option- C - 'Haemolymph'.

Note: In an open Vascular system hemolymph directly bathes the organs along with tissues. The blood and interstitial fluid in the open Vascular system cannot be distinguished.