Fill in the following blanks with suitable words :

(a) Gums and resins are the ................. products of plants.

(b) Bowman's capsule and tubule taken together make a...................

(c) The organs which extract the nitrogenous wastes from the blood are ..................

(d) The extracellular fluid which always flows from body tissues to the heart is called..................

(e) The ............blood cells make antibodies whereas............. blood cells help in respiration.