Free Body Fluids And Circulation (Daily Quiz: 17) NEET Biology Questions & Answers with Detailed Explanation & Full Review

Answer: (a)

Presence of calcium will remove heparin - blood anticoagulant and will promote blood clotting. Sodium oxalate and heparin containing test tubes will not allow the blood to clot.

Answer: (c)

Periplaneta has open circulatory system, i.e., the blood does not flow in blood vessels but flows in a haemocoel (body cavity). The circulatory systems of all vertebrates, as well as of annelids (for example, earthworms) and cephalopods (squid and Octopus) are closed, in which the blood never leaves the system of blood vessels consisting of arteries, capillaries and veins.

Answer: (d)

Lymphocytes have a very large, rounded nucleus and scanty cytoplasm. They are nonmotile and nonphagocytic. They secrete antibodies to destroy microbes and their toxins, reject grafts and kill tumour cells. They also help in healing of injuries. Thrombocytes aid in clotting of blood. Monocytes are phagocytic in nature and erythrocytes (RBCs) transport gases in the body.

Answer: (b)

Spleen is a vertebrate organ, lying behind the stomach, that is basically a collection of lymphoid tissue. Its functions include producing lymphocytes and destroying foreign particles. It acts as a reservoir for RBCs and can regulate the number in circulation. It is also the site for the breakdown of worn out RBCs and thus is known as graveyard of RBCs.