Question

Name the structure that helps in excretion and osmoregulation in earthworm and cockroach?

Answer 1

The ventral nerve twine makes up the worried machine of a few phyla of the invertebrates, especially in the nematodes, annelids and the arthropods. It commonly consists of cerebral ganglia anteriorly with the nerve cords strolling down the ventral aircraft of the organism. This characteristic is essential in qualifying the distinction in comparison to the chordates that have a dorsal nerve cord. It is present in every cockroach and earthworm.

Complete answer:

Excretion and osmoregulation is done with help of Nephridia in earthworms.
Excretion and osmoregulation is done with the help of Malpighian tubules in cockroaches.
Both cockroach and earthworm have a neural machine encompassing paired ganglia linked with the aid of using lateral nerves to a double ventral nerve twine.
The body of an earthworm is protected externally with the aid of a skinny layer of non-mobile cuticle.
Excretion takes place through malpighian tubules in the cockroach.
The excretory gadget consists of a pair of nephridia in every segment, except for the primary 3 and the last ones.
The 3 kinds of nephridia are: integumentary, septal, and pharyngeal. The integumentary nephridia lie connected to the internal side of the body wall in all segments besides the primary.
The septal nephridia are attached to both facets of the septa behind the fifteenth segment. The pharyngeal nephridia are linked to the fourth, 5th and 6th segments.
The waste in the coelom fluid from a beforehand phase is drawn in with the useful resource of the beating of cilia of the nephrostome.
Malpighian tubules are the excretory organ of the cockroach. It is determined at the junction of the midgut and hindgut and is about a hundred fifty in quantity.
The distal parts of the tubules extract inorganic ions, uric acid and amino acids through active delivery and water via diffusion from the surrounding hemolymph.
The filtrate movements are closer to the ileum. In the proximal factors of the malpighian tubules water and other useful substances are reabsorbed.

Note: Malpighian tubules are fine, yellow coloured and branched threads determined in bundles. They lie freely in the hemolymph whereas integumentary nephridia lie connected to the internal side of the body wall in all segments besides the primary. Only a few discriminating features are there which are specific to one kind of species like nephridia is found only in earthworms, moulting of the cuticle is present only in the cockroach.