Question

1. A) How does the segmentation of an arthropod differ from the segmentation of an annelid?

B) How do insects respire?

C) List an anatomical feature common to all arthropods.

D) What organ(s) do insects use to eliminate metabolic wastes?

F) List two specific ways a tunicate larva differs from the adult.

Answer 1

A) In case of annelids, the body is composed of complete segmentation known as metamerism whereas, in arthropods, the segmentation is incomplete.

B) In insects, breathing is mediated by small tube-shaped structures called tracheae.

C) An anatomical feature common to all arthropods is the presence of a ventral nervous system.

D) In insects, the primary excretory organs are malpighian tubules. In addition to these, other excretory organs such as fat bodies and nephrocytes can also be used by insects for excretion.

F) In tunicate larva, the dorsal nerve cord and notochord are present. However, in adult form, these structures are absent. Moreover, larva forms are free swimmers whereas, adult forms are generally sessile.