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In Hydra, the physiological division of labour is exhibited by

A. cellular layers

B. tissues

C. cell differentiation

D. organs

Correct Answer :

C. cell differentiation


Related Questions

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Brain coral is

A. Fungia

B. Hydra

C. Meandria

D. Tubipora

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In Hydra, the gastrodermis is composed of

A. musculo-epithelial cells

B. musculo-nutritive cells

C. sensory cells

D. cniboblasts

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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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Digestion in Hydra is

A. intracellular

B. extracellular

C. first extracellular, then intracellular

D. first intracellular, then extracellular

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Tentacles of Hydra help in

A. locomotion

B. food capturing

C. locomotion and food capturing

D. respiration

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Coelenteron in Hydra serves the purpose of

A. digestion and circulation

B. digestion and storage

C. excretion and digestion

D. circulation and storage

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Pueumatophore is present in

A. Tubularia

B. Obelia

C. Hydra

D. Physalia

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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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Cindom is a

A. battery of nematocysts

B. group of nematocysts

C. armed thread

D. none of these

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In jelly fishes, the adult is always

A. polypoid

B. medusoid

C. polymorphic

D. hydroid

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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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Hydra has no special structure for

A. attachment

B. respiration

C. food capturing

D. offense

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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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Division of labour on morphological basis is well exemplified by

A. Hydra

B. Obelia

C. Monkey

D. Elephant

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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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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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The number of tentacles in Hydra is

A. 24

B. 610

C. 1040

D. 4050

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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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Coral reef formation is mainly related to

A. sponges

B. anthozoans

C. molluscs

D. hydrozoans

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Most favourite food of Hydra is

A. bacteria

B. water fleas

C. tadpoles

D. fishes

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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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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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The small green alga that lives inside Hydra is called

A. Zoochlorella

B. Chlamydomonas

C. Euglena

D. None of these

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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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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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What is common between Hydra and Obelia ?

A. Both show polymorphism

B. Both possess a larval stage in their life history called planula

C. Both are found in fresh water

D. Both havb a jelly like mesoglea with no cells

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If nematocysts are absent in Hydra, which is affected

A. Locomotion

B. Predation

C. Both (a) and (b)

D. Reproduction

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The mesoglea in Hydra is traversed by

A. sensory cells

B. nerve cells

C. interstitial cells

D. all of these

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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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Hydra respires through

A. mesoglea

B. general surface

C. pellicle

D. gastrodermis