Where is the esophagus in an earthworm?
The esophagus leads from the pharynx but you probably won’t be able to see it, since it lies underneath the heart. You will find two structures close to the clitellum. First in the order is the crop, followed by the gizzard. The gizzard leads to the intestine, which is as long as the worm and ends at the anus.
What is the function of the earthworm pharynx?
The pharynx acts as a suction pump; its muscular walls draw in food. In the pharynx, the pharyngeal glands secrete mucus. Food moves into the esophagus, where calcium (from the blood and ingested from previous meals) is pumped in to maintain proper blood calcium levels in the blood and food pH.
What two structures are connected by the esophagus earthworm?
Pharynx: This is the light-colored organ just inside the mouth. Its muscular contractions pass food on down to the esophagus. Hearts (or ‘aortic arches’): Behind the pharynx are five dark loops wrapped around the esophagus. These are the blood vessels that serve as the hearts of the worm.
What is the function of the sperm duct in an earthworm?
Function: They store sperm in diverticula during copulation and the ampulla provide nourishment for the sperm.
Which one is correct about earthworm?
Earthworms have a brain that connects with nerves from their skin and muscles but does not have a distinct head. They have setae, which helps in locomotion. They secrete cocoon around fertilised eggs. So, the correct answer is option C.
Does earthworm have a distinct head?
Unlike sponges or cnidarians, worms have distinct head and tail ends. Worms are the simplest animals with a brain. Worms’ brains are very simple; just a knot of nerve tissue located in the head end.
Which of the following structure is not paired in earthworm?
So the correct answer is ‘Macronephridia’.
What is correct for Pheretima?
Hint: Pheretima is the genus name of the Earthworm. The earthworm is a member of the phylum Annelida of the order Oligochaeta. Also, the earthworm is a hermaphrodite organism.
Which of the following option is correct for Pheretima?
All the segments are alike except for the first and last ones. Further, in a mature earthworm, there exists a band of glandular tissue known as the clitellum. This is present on segments 14 to 16 and forms a girdle around these and secrete mucous and albumen. Thus, the correct answer is option C.
What is the function of Calciferous glands?
The true function of the calciferous glands is excretion, calcium carbonate being passed into the gut as crystals of calcite which are chemically inactive in the gut.
Which of the following structures is Pheretima?
Clitellum is a girdle, where there are gland cells which secrete a substance which dries up to form the cocoon in which the egg is discharged and sperms too so as to ensure fertilization. In the cocoon the embryo of earthworm develops. The gizzard is located (front end to back end) after the crop in the earthworm.
In which segment of earthworm Clitellum is present?
The clitellum is a thickened glandular and non-segmented section of the body wall near the head in earthworms and leeches, that secretes a viscid sac in which eggs are stored. It is located near the anterior end of the body, between the fourteenth and seventeenth segments.
Why the Colour of earthworm is brown?
Earthworms are usually reddish brown in colour. – Earthworms are dark brown in colour due to the presence of porphyrin pigment. It protects their body from the harmful UV rays of the sun.
Are worms male and female?
Earthworms are hermaphrodites, meaning an individual worm has both male and female reproductive organs. Earthworm mating typically occurs after it has rained and the ground is wet. They emerge from the soil and jut out their anterior end.