Metameric segmentation is absent in platyhelminthes, Echinodermata, Mollusca etc. Metameric segmentation is the characteristic of Annelida (e.g., earthworm) and Arthropoda (e.g. Cockroach). In earthworm body consists of 100-120 ring-like segments or somites called metameres.
Is cockroach Metamerically segmented?
(b) Indeterminate and radial cleavage during embryonic development. (c) Exoskeleton composed of N-acetylglucosamine. (d) Metamerically segmented body. Hint: Periplaneta americana is the American cockroach, and it is an arthropod that undergoes protostome development.
Which characteristic is not of Americana Periplaneta?
So, the correct option is ‘Indeterminate and radial cleavage during embryonic development‘.
Which of the following is not associated with Periplaneta americana?
“Which of the following features is not present in Periplaneta americana?” Cockroach has determinate cleavage during embryonic development and it develops into ny1nph, which is a fully developed cockroach except its size as it is much smaller than the adult one.
What is the main difference between male and female cockroach?
Complete answer:
| Male Cockroach | Female Cockroach |
|---|---|
| The male cockroaches’ antennae are smaller than the females’. | The antennae are relatively bigger than males’. |
| There are Anal styles. | There are no anal styles. |
| The male cockroach abdomen is slender. | The female cockroach’s abdomen is shaped like a boat and is blunt. |
Is cockroach a Coelomate?
Cockroaches also have true coelom. However, the body cavity of cockroach is called as haemocoel as the body cavity remain filled with insect blood (haemolymph). They do not posses an arrangement of blood vessels as in mammals.
Why do cockroaches heads move easily?
Why head of the Cockroach can move easily in all the directions ? (A) In Cockroach head and thorax fuse to form Cephalothorax. (B) Anatomy of mouthpart, are so arranged that head can move easily in all the directions. (C) Head is attached to thorax through a flexible neck.
What is Uricose?
Uricose glands are found associated with the mushroom-shaped gland of the male reproductive organ as long blind tubules at its periphery. These can also store uric acid and discharge it at the time of copulation over the spermatophore. These glands are also called utriculi majores.
What order is the American cockroach in?
How many of them are found in Periplaneta americana?
Forty-seven species are included in the genus Periplaneta, none of which are endemic to the U.S. (Bell and Adiyodi 1981). The American cockroach, Periplaneta americana, was introduced to the United States from Africa as early as 1625 (Bell and Adiyodi 1981).