Q.1: ____________ are needed for the clotting or coagulation of blood.
Q.2: ___________ are the most abundant cells of the WBCs.
Q.3: ____________ are formed by the conversion of inactive fibrinogens in the plasma by the enzyme thrombin.
Q.4: ___________ is a colourless fluid containing specialised lymphocytes which are responsible for the immune responses of the body.
Q.5: ____________ resist infections and are also associated with allergic reactions.
Q.6: Which of the following statements is/are correct about plasma ?
i) It constitutes nearly 55% of the blood.
ii) Glucose, amino acids, lipids, etc. are present in it.
iii) 80-85% of plasma is water.
a) i and iii
b) only iii
c) only ii
Q.7: ___________ is the graveyard of RBCs.
a) bone marrow
Q.8: Exchange of nutrients, gases, etc. between the blood and the cells always occur through _____________ fluid.
Q.9: Which of the following statements is/are true about RBCs ?
i) They are the most abundant cells in blood.
ii) They are biconcave in shape.
iii) Their average life span is 120 days.
iv) Nucleated RBCs are found in reptiles and amphibians.
a) ii and iv
b) iii and iv
c) i, ii, iii and iv
Q.10: Megakaryocytes is responsible for the production of ________________.