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4

Coral reef formation is mainly related to

A. sponges

B. anthozoans

C. molluscs

D. hydrozoans

Correct Answer :

B. anthozoans


Related Questions

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

A. Endodermal cells

B. Mouth

C. Nematocysts

D. Tentacles

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Brain coral is

A. Fungia

B. Hydra

C. Meandria

D. Tubipora

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Nematocysts of Hydra are important for

A. cataching prey

B. paralysing prey

C. testing the food

D. testing the water

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The body of Hydra is

A. asymmetrical

B. bilaterally symmetrical

C. radially symmetrical

D. irregular

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Hydra prevents self fertilization by being

A. protogynous

B. hermaphrodite

C. monoecious

D. protandrous

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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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Body wall of coelentrates is described as

A. diploblastic

B. integument

C. multicellular

D. triploblastic

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A Hydra usually possess

A. single testis and many ovaries

B. single ovary and many testes

C. one testis and one ovary

D. many testes and many ovaries

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The scientific name of organ pipe coral is

A. Tubipora

B. Astrangia

C. Meandra

D. Aeropora

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The number of tentacles in Hydra is

A. 24

B. 610

C. 1040

D. 4050

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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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Hydra is

A. marine, radial, symmetrical and diploblastic

B. fresh water, biradial, symmetrical and triploblastic

C. fresh water, radial, symmetrical and diploblastic

D. marine, radial, symmetrical and triploblastic

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Coral reef formation is mainly related to

A. sponges

B. anthozoans

C. molluscs

D. hydrozoans

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The tentacles of Hydra are

A. pinnate

B. hollow

C. solid

D. frilled

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In Hydra, buds always arise at

A. the hypostome

B. the junction of hypostome and stomach

C. in junction of stomach and stalk

D. the stomach

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Ephyra is the larval form of

A. Sea anemone

B. Aurelia

C. Obelia

D. Hydra

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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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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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Division of labour on morphological basis is well exemplified by

A. Hydra

B. Obelia

C. Monkey

D. Elephant

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The nematocysts which are mainly used for defense and offense and which tightly coil around the prey are

A. steptoline or atrichous

B. streptoline or holotrichous

C. volvent or desmonemes

D. penetrant or stenoteles

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The larva of Hydra is known as

A. hydrula

B. planula

C. tadpole

D. amphiblastula

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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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In Hydra, the absence of circulatory system is fulfilled by

A. ectoderm

B. endoderm

C. mesoglea

D. coelenteron

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In jelly fishes, the adult is always

A. polypoid

B. medusoid

C. polymorphic

D. hydroid

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Polymorphism is found in

A. Hydra

B. Aleyonium

C. Aurelia

D. Physalia

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Most favourite food of Hydra is

A. bacteria

B. water fleas

C. tadpoles

D. fishes

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A piece of Hydra will regenerate into a full Hydra if it contains a part of

A. epidermis alone

B. gastrodermis alone

C. both (a) and (b)

D. (a), (b) and tentacles

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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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Polymorphic coelentrates are the members of the class

A. hydrozoa

B. scyphozoa

C. actinozoa

D. all of these