Question

Heart of the prawn carries
A. Oxygenated blood
B. Deoxygenated blood
C. Mixed blood
D. No blood

Answer 1

Hint: Prawn (Penaeus) belongs to the phylum Arthropoda which is the largest phylum of the animal kingdom. Heart of Prawn is open type . It lacks veins and capillaries , only arteries are present. Arteries pump only oxygenated blood from heart to body .

Complete step by step answer:
-Blood vascular arrangement of prawn is 'open type'. In prawns, lack of capillaries and veins.
-The heart siphons unadulterated blood in supply routes, which partition and redivide into exceptionally little parts of veins and open uninhibitedly in haemocoel.
-The blood moves through these sinuses or blood lacunae into the whole body. All blood sinuses open into a couple of long yet unclear ventral sinus.
-Different branchial channels convey unclean blood from ventral sinuses to gills, where it’s refined (oxygen broken down in water inside gills is taken in blood by dispersion and carbon dioxide present in blood is removed out in water).
-The unadulterated blood from each side of gills is passed on to pericardial sinus by different branchial channels and is then gotten back to the heart.
-In this manner, the heart consistently contains oxygenated blood, however the corridors contain blended blood.
So, the correct answer is option (A) Oxygenated blood.

Note: Arterial heart is present in Prawns. Heart is joined with the pyloric stomach by a cardiac pyloric strand. The foremost finish of the heart, called the pinnacle is pointed and the wide end base is coordinated posteriorly. The whole structure is encased inside a haemocoelomic space, called pericardial sinus, the divider of which fills in as pericardium.