Invertebrate Zoology

Ecdysis is the moulting of the cuticle in many invertebrates. Moulting is the defining feature of Ecdysozoa, comprising the arthropods, nematodes, velvet worms, horsehair worms, tardigrades and Cephalorhyncha. Since the cuticle of these animals typically forms a largely inelastic exoskeleton, it is shed during growth and a new, larger covering is formed.

Renette cells are H- shaped excretory organs present in roundworms.

Nephredia is the excretory organ in  Annelida.

In the digestive system of a cockroach food is stored in the crop.

 Scorpion gives birth to live young after the eggs hatch inside the animal.

 Annelid cuticle is characterised by collagen makeup and no moulting occurs.

 Placoid scales are found in cartilaginous fish like sharks and rays.

Pseudopodial movement is exhibited only by unicellular organisms and all insects are multicellular.

In phylum Arthropoda, different types of respiratory organs had evolved. In terrestrial arthropods book lungs and trachea developed.In scorpions and spiders, respiration takes place by book lungs.

This is the correct option because wasps, houseflies and beetles all can crawl as well as fly.

A spider catches its prey in its web. Houseflies carry disease-causing germs to our food. Lice and leech suck blood. All these statements are correct.

Ascaris lumbricoides is the scientific name for the human roundworm.

It is the smallest nematoblast which has a smooth thread tube that helps in glutination.

It is a simple, gradual and direct metamorphosis in which immature forms resemble the adult, except in size, and are referred to as nymphs. Grasshoppers have paurometabolic type of metamorphosis.

Aplysia, commonly known as the sea hare, is a genus of medium-sized to very large sea slugs, which are marine gastropod mollusks.