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4

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

Correct Answer :

A. epidermis alone


Related Questions

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A coelentrate, commonly known as fresh water polyp is

A. Hydra

B. Obelia

C. Physalia

D. Acerelia

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Coral reef formation is mainly related to

A. sponges

B. anthozoans

C. molluscs

D. hydrozoans

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The flagella of food-absorbing cells in hydra aid in

A. stirring up the digestive fluid in the digestive cavity

B. engulfing food particles

C. engulfing semi-digested particles inside food- absorbing cells

D. none of these

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The mouth opens into a large single cavity in Hydra

A. coelom

B. enterocoel

C. pseudocoel

D. coelenteron

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Ephyra is the larval form of

A. Sea anemone

B. Aurelia

C. Obelia

D. Hydra

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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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A hydranth is

A. Blastostyle of Obelia

B. Gonad of Hydra

C. Medusa of Obelia

D. Polyp of Obelia

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Among coelenterates medusoid individuals are absent in members of the class

A. hydrozoa

B. scyphozoa

C. anthozoa

D. all the three

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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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The small green alga that lives inside Hydra is called

A. Zoochlorella

B. Chlamydomonas

C. Euglena

D. None of these

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Which of the following tissue is absent in Hydra ?

A. Connective tissue

B. Epithelial tissue

C. Muscular tissue

D. Nervous tissue

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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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Ctenophores generally exhibit

A. bilateral symmetry

B. radial symmetry

C. asymmetry

D. spherical symmetry

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Hydra has no special structure for

A. attachment

B. respiration

C. food capturing

D. offense

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Ctenophores differ form cnidorians in one important aspect, that is

A. absence of musculoepithelial cells in the body wall

B. absence of nematocysts

C. absence of sensory cells

D. absence of sexual reproduction

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The scientific name of organ pipe coral is

A. Tubipora

B. Astrangia

C. Meandra

D. Aeropora

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In Hydra, the physiological division of labour is exhibited by

A. cellular layers

B. tissues

C. cell differentiation

D. organs

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The first invertebrates to develop a true nervous system are

A. sponges

B. coelenterates

C. annelids

D. arthropods

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

A. Earthworm

B. Hydra

C. Amoeba

D. Cockroach

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Hydra is put under phylum coelentrata because it has

A. tentacles

B. cnidoblasts

C. hypostome

D. interstitial cells

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The testes of hydra are located

A. below the ovaries

B. below the tentacles

C. further down the tentacles to occupy central position of the body

D. anywhere on the body between tentacles and adhesive disc

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The body wall of Hydra consists of

A. ecotderm and endoderm

B. ectoderm and mesoderm

C. ectoderm, mesoderm and endoderm

D. epidermis, mesoglea and endoderm

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Strobilization is the characteristic feature of

A. Aurelia

B. Hydra

C. Metridium

D. Physalia

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The tentacles of Hydra are

A. pinnate

B. hollow

C. solid

D. frilled

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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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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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The larva of Hydra is known as

A. hydrula

B. planula

C. tadpole

D. amphiblastula

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The mesoglea present in Hydra in between epidermis and gastrodermis is

A. non-cellular and jelly like material

B. cellular jelly like material containing sensory cells

C. cellular jelly like material containing nerve cells

D. both (a) and (c)

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Hydra prevents self fertilization by being

A. protogynous

B. hermaphrodite

C. monoecious

D. protandrous