Hold it between thumb and first finger of the left hand and cut few thin sections. In plants, the strongest component of the complex cell wall is a carbohydrate called cellulose, which is a polymer of glucose. Leave the alcohol to evaporate. Food particles are moved up into the mouth as it closes. Gastropods replace their radular teeth throughout their entire life cycle.
Circulation of Blood: The ventricle of the heart pumps blood through the branches of cephalic aorta and visceral aorta Fig. Its flesh is commonly used as prawn feed in aquaculture. Conclusions: Studies on the freshwater snail P. Now, take out the animal, along with slides, rinse and remove the slides slowly and gently. From the kidneys the blood is collected by renal vein and taken to auricle.
Excretory System of Pila: The excretory organ in Pila is the kidney. Dehydrate, clear and mount in canada balsam. Near the septum along the mid ventral line of alimentary canal look for a pair of dark blackish brown hearts. Pulmonary sac lung : It is a large bag hanging in the mantle cavity from the roof of the mantle. On the outer side of vas deferens, in each p segment, lies a white coiled nephridium. The main visceral artery runs along the left margin of the posterior renal chamber and sends branches to the intestine and the posterior renal chamber. Now, hold the piece of mantle between first finger and thumb of left hand.
At the base of the penis sheath is an oval glandular thickening, the hypobranchial gland, consisting of tall cells containing small basal nuclei. Cephalic aorta supplies blood to the osphradium, foot, pulmonary sac and the mantle. Before publishing your Notes on this site, please read the following pages: 1. Make a longitudinal cut in the mid-dorsal line of the animal in the region of clitellum and expose the seminal vesicles. The food is mixed with digestive enzymes and slime with the muscular movements in the gizzard and which connects with vestibule. The parents do not incubate or look after the eggs.
A major function of the cell wall is to … act as a pressure vessel, preventing over-expansion when water enters the cell. There are numerous small lacunae in which the blood vessels end. A few species of this genus is found in India, of which the most common species is Pila globosa. Look for a pair of whitish, flattened and glandular structures floating in water, attached to the anterior end of alimentary canal in-front the crop. The embryo floats in a central core of liquid albumen which is surrounded by a thick layer of whitish solid albumen. Dehydrate up to 70% alcohol, stain with Picro-indigo-carmine, or Borax-carmine dehydrate up to 100% alcohol, clear in Xylol and mount in canada balsam.
It opens outside through anus. Pila being amphibious shows an adaptation for water conservation during terrestrial phase by converting ammonia into the insoluble uric acid. Monocystis : It is an endoparasitic protozoan found in the reproductive organs, especially seminal vesicles, of male earthworms. Genus — Pila Species — globasa Habitat: Pila is fresh water mollusca. Put the coverslip above the specimen in such a way that it should cover the glass pieces completely. They are dark brown, small rounded structures. The shell opens out by a large opening called shell mouth.
On this odontophore radula moves. It turns to left and enters the visceral mass to open into the stomach. Digestive glands : 1 Buccal glands 2 Salivary glands 3 Digestive gland or Hepatopancreas. Hydra : The study of entire hydra in living condition may conveniently be made by picking a hydra, through dropper, from either culture in laboratory or from aquatic plants in any pond or ditch having stagnent water and decaying material. The posterior part of the vestibule is marked by a pair of jaws, connected by a thin cuticular membrane.
Head is well marked and prolonged into a partly contractile snout. The aorta immediately bifurcates into two arteries, the anterior one is called cephalic aorta, supplying blood to the head region and the posterior or visceral aorta which supplies blood to the posterior part of the body. It is highly muscular and contains pedal glands. Now, take out the animal, along with slides, rinse and remove the slides slowly and gently. Their secretion consists of mucus and a starch digesting enzyme.