Hydra receives impulses and stimuli through

• nerve net

• nematocytes

• sensory cells

• flame cells

Ambulacral grooves are absent in the living forms of the Class

• Crinoidea

• Asteroidea

• Ophiuroidea

• Echinodermata

As per classification which of the following is correct ?

• Ascaris, Pheretima, Grasshopper

• Hydra, Pterido, Leucosolenia

• Starfish, Grasshopper, Solen

• Pila, Dentalium, Octopus

Which of the following Phyla are included in Enterozoa?

• Annelida, Mollusca, Porifera

• Echinodermata, Hemichordata, Porifera

• Mollusca, Arthropoda, Hemichordata

• Porifera, Mollusca, Arthropoda

The sites of the first, second and third moulting of the Ascaris larva are respectively

• soil, lung and intestine

• liver, stomach and intestine

• soil, alveoli and alveoli

• soil, intestine and lung

Identify the correct statement

• In amniotes last nerve is spinal accessory

• In non- amniotes last nerve is vagus.

• Optic is shortest nerve

• Olfactory nerves has mixed fibres.

Which of the following is a coelenterate ?

• Sea lily

• Sea squirt

• Sea cucumber

• Sea fan

Class Crustacea has following features :

• Cephalothorax, book lungs, chitinous exoskeleton

• Head and thorax, biramous appendages, book lungs

• Head and thorax, book lungs, chitinous exoskeleton

• Cephalothorax, biramous appendages, gills

Commercial silk is obtained from :

• cocoon/ pupa

• caterpiller

• adult moth

• both egg and adult moth

In which of the following class of Annelida, one pair ovaries and several pair testes are found ?

• Archiannelida

• Hirudinea

• Oligochaeta

• Polychaeta