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(a) arachnids Explanation: Scorpion, spider, tick and mites comes under class arachnida of phylum arthropoda.

(a) All echinoderms are viviparous. Explanation: The animals of phylum echinodermata are oviparous. They have the ability of regeneration.

(a) Brain, dorsal nerve cord, highly developed receptors Explanation: Chordates are a group of animals such as fish, frogs, snakes, birds, dogs, m...

(b) Earthworm - Closed circulatory system Explanation: Earthworm has closed circulatory system. The blood circulates in definite walled blood vess...

(d) Invertebrate animals have more undifferentiated cells than vertebrate animals have. Explanation: Invertebrates, animals without a backbone suc...

(a) Morphallaxis - Regeneration of two transversely cut equal pieces of a Hydra into two small hydras. Explanation: Morphallaxis refers to the typ...

(a) Nephridia Explanation: Nephridia are invertebrate organs which function similarly to kidneys. They remove metabolic wastes from an animal’s bo...

(d) Lamprey Explanation: A lamprey (sometimes also called as lamprey eel) is a jawless fish that belongs to the class cyclostomata. Lampreys posse...

(d) a muscular diaphragm and milk-producing glands. Explanation: Mammals are characterised by muscular diaphragm and milk producing glands.

Correct option: (b) Explanation: Millipede is myriapod, silver fish is insecta and sea anemone is diploblastic. Duck bill platypus is a small semi...

(c) Jointed appendages and chitinous exoskeleton. Explanation: Silverfish, scorpion, dragonfly and prawn are arthropods. They are characterised by...

(b) Nephridia in earthworm, Malpighian tubules in cockroach and urinary tubules in rat. Explanation: Nephridia in earthworm, malpighian tubules in...

(a) When water is not available camels do not produce urine but store urea in tissues. Explanation: When water is not available, the camels produc...

(b) Ventral nerve cord Explanation: In leech, cockroach and scorpion, double ventral nerve cord is present.

(d) Phlebotomus to Leishmania donovani Explanation: Phlebotomus (sand fly) transmits Leishmania donovani which causes dum dum fever/kala azar.

(a) precystic stage Explanation: Chromatid bodies are present in the precystic stage in Entamoeba histolytica. These bodies disappear as the cyst ...

(c) Lizard, Crow Explanation: Animals excreting uric acid are called uricotelic. It is least toxic and causes least loss of body water, e.g. land ...

(b) sensory cells Explanation: Hydra has diffused type of nervous system. It receives stimulus through sensory cells scattered in epitheliomuscula...

(c) Spongin fibres Explanation: Spongin is an organic horny elastic substance. They are fibres insoluble, chemically inert and resistant to protei...

(a) soil, alveoli, lung Explanation: The rhabditoid larva moults within egg shell in soil to form second stage rhabditoid (capable of infection). ...