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Which of the following animals has a nervous system but no brain ?

A. Earthworm

B. Hydra

C. Amoeba

D. Cockroach

Correct Answer :

B. Hydra


Related Questions

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In Hydra, the nematocysts are abundant on

A. upper part

B. middle part

C. tentacles

D. lower part

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Six septa or six mesenteries are characteristic of

A. Aurelia

B. Sea anemone

C. Obelia

D. Hydra

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A chitinous material is present in the

A. coenosarc of Obelia

B. perisarc of Obelia

C. body wall of Sea anemone

D. umbrella of Aurelia

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Polymorphism is best defined as the occurrence of

A. several types of organ-systems in an individual

B. different kinds of larval forms in the life history of an animal

C. different functions performed by a single kind of organism

D. several different types of individuals in a species

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Hydra prevents self fertilization by being

A. protogynous

B. hermaphrodite

C. monoecious

D. protandrous

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Digestion in Hydra is

A. intracellular

B. extracellular

C. first extracellular, then intracellular

D. first intracellular, then extracellular

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Polymorphism is found in

A. Hydra

B. Aleyonium

C. Aurelia

D. Physalia

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Communication between the enteron and exterior in coelentrates is through

A. mouth only

B. mouth and anus

C. large number of pores in the body wall

D. both (b) and (c)

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Coelenteron of Hydra serves the double purpose of

A. digestion and circulation

B. digestion and storage

C. excretion and locomotion

D. circulation and storage

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Tentaculocysts in Obelia are meant for

A. locomotion

B. balancing

C. swimming

D. reproduction

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Strobilization is the characteristic feature of

A. Aurelia

B. Hydra

C. Metridium

D. Physalia

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Nutritionally Hydra is

A. saprozoic

B. herbivorous

C. insectivorous

D. carnivorous

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Cindom is a

A. battery of nematocysts

B. group of nematocysts

C. armed thread

D. none of these

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Rhopalia are the sense organs in medusa belonging to the class

A. hydrozoa

B. scyphozoa

C. actinozoa

D. all of these

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Hydra has no special structure for

A. attachment

B. respiration

C. food capturing

D. offense

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Hydra reproduces by gemmation (budding) when

A. Plenty of food is present

B. Pond dries up

C. Water becomes muddy

D. Hydra is alone

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Division of labour on morphological basis is well exemplified by

A. Hydra

B. Obelia

C. Monkey

D. Elephant

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The scientific name of organ pipe coral is

A. Tubipora

B. Astrangia

C. Meandra

D. Aeropora

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Brain coral is

A. Fungia

B. Hydra

C. Meandria

D. Tubipora

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Which one is found in Hydra

A. Metabolism

B. Metamerism

C. Melting

D. Metamorphosis

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Musculo-glandular cells are found in hydra

A. on the tentacles

B. on the hypostome

C. on the basal disc

D. in the gastrodermis

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The body of Hydra is

A. asymmetrical

B. bilaterally symmetrical

C. radially symmetrical

D. irregular

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"Portuguese Man of War" is the common name for

A. Aurelia

B. Metridium

C. Physalia

D. Tubipora

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If a Hydra is cut into two pieces, it is noted that

A. both parts die

B. both parts make up the loss and form two new individuals

C. both parts live independently as they are

D. none of these

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What structures in Hydra functionally correspond to the pseudopodia of Aamoeba ?

A. Endodermal cells

B. Mouth

C. Nematocysts

D. Tentacles

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Which of the following animals has a nervous system but no brain ?

A. Earthworm

B. Hydra

C. Amoeba

D. Cockroach

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Pueumatophore is present in

A. Tubularia

B. Obelia

C. Hydra

D. Physalia

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Body wall of coelentrates is described as

A. diploblastic

B. integument

C. multicellular

D. triploblastic

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The mesoglea of Hydra contains

A. nerve cells

B. sensory cells

C. muscle fibres

D. no cells

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The mouth opens into a large single cavity in Hydra

A. coelom

B. enterocoel

C. pseudocoel

D. coelenteron