The phenomenon of production and emission of light by an organism as a result of chemical reaction during which chemical energy is converted to light energy is called bioluminescence.

Ctenoplana from phylum-Ctenophora, exhibits the phenomenon of bioluminescence.

(a) Crocodilus (crocodile) is a cold blooded animal.

(b) Elephas maximus (elephant), (mammal) is warm blooded animal.

(c) Testudo (tortoise) bears dry and cornified skin.

(d) Ascaris (roundworm) is a dioecious animal.

Animals in which the cells are arranged in two embryonic layers, an external ectoderm and an internal endoderm are called diploblastic animals (e.g., coelentrates). While those animals in which the developing embryo has a third germinal layer, i.e., mesoderm lying between the ectoderm and endoderm are called triploblastic animals. (e.g., chordates).

(a) Roundworm - Ascaris

(b) Fish possessing poison sting - Trygon

(c) A limbless reptile/amphibian - Ichthyophis

(d) An oviparous mammal - Duck billed platypus.

(a) Haemocoel is the blood-filled cavity in arthropods containing haemolymph.

(b) Medusa is a form in cnidarians in which the body is shaped like an umbrella which can float freely in sed water

(c) Nematocytes are capsules of specialised cells in cnidarians which act as a paralysing sting.

(d) Parapodia are the paired unjointed lateral outgrowth in annelids bearing chaetae.