Arthropods : ________________, _______________

Complete the following paragraph by filling in the blanks (i) to (v) with appropriate words: (i) __________ make up about 80% of the animal kingdom. Their bodies have a hard, outer covering or exoskeleton made up of a proteinaceous substance called (ii) ________ The body is divided into a (iii) __________ thorax, and (iv) _______ It also bears multiple pairs of jointed legs. Arthropods also have antennae and (v) ________ on their heads.

A viviparous arthropod is

Salamander is an ___________ (amphibian/arthropod).

An arthropod without a true head is

The arthropod exoskeleton is formed of

An arthropod having unjointed legs is

The viviparous arthropod is

Characteristics which are common to the Arthropod, Mollusk, Echinoderm and Chordate lines are a (an)

In the following questions , a statement of assertion (A) is followed by a statement of reason (R). A: Arthropods are the most successful of all animal groups. R: Evolution of jointed appendages and chitinous exoskeleton allowed arthropods to successfully invade every habitat on earth.

Which of the following are correct ? (i) Sponges : Cellular level of organisation (ii) Cnidaria : Tissue level of organisation (iii) Platyheminthes : Organ level of organisation (iv) Annelids, Arthropods, Molluscs, Echinoderms and Chordates : Organ system level of organisation