List out the parasitic adaptations in leech.

Explanation

(i) The suckers are the primary organ of the blood sucking.
(ii) The blood is sucked by muscular pharynx.
(iii) Leeches attaches itself to the body of host by Anterior and Posterior ends of the body.
(iv) The three jaws inside the mouth, c auses a painless triradiate or Y shaped incision in the skin of the host.
(v) A protein called hirudin is produced in the salivary gland of leech to prevent blood coagulation. Thus, a continuous supply of the blood is maintained.
(vi) Parapodia and setae are completely absent.
(vii) Leeches also inject an anaesthetic substances that prevents the host from feeling their bite.
(viii) In the crop, blood is stored which gives nourishment to the leech for several months. Due to this reason there is no eloborate secretion of the digestive juices and enzymes