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In Hydra, the absence of circulatory system is fulfilled by

A. ectoderm

B. endoderm

C. mesoglea

D. coelenteron

Correct Answer :

D. coelenteron


Related Questions

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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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"Portuguese Man of War" is the common name for

A. Aurelia

B. Metridium

C. Physalia

D. Tubipora

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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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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 mesoglea of Hydra contains

A. nerve cells

B. sensory cells

C. muscle fibres

D. no cells

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The tentacles of Hydra are

A. pinnate

B. hollow

C. solid

D. frilled

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Hydra prevents self fertilization by being

A. protogynous

B. hermaphrodite

C. monoecious

D. protandrous

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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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Hydra reproduces by budding when

A. plenty of food is present

B. pond is going dry

C. Hydra is alone

D. water becomes muddy

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Polymorphic coelentrates are the members of the class

A. hydrozoa

B. scyphozoa

C. actinozoa

D. all of these

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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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Hydra respires through

A. mesoglea

B. general surface

C. pellicle

D. gastrodermis

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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 coelentrate, commonly known as fresh water polyp is

A. Hydra

B. Obelia

C. Physalia

D. Acerelia

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Which one is found in Hydra

A. Metabolism

B. Metamerism

C. Melting

D. Metamorphosis

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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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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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Nutritionally Hydra is

A. saprozoic

B. herbivorous

C. insectivorous

D. carnivorous

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Coral reef formation is mainly related to

A. sponges

B. anthozoans

C. molluscs

D. hydrozoans

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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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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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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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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 gastrodermis is composed of

A. musculo-epithelial cells

B. musculo-nutritive cells

C. sensory cells

D. cniboblasts

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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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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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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 mouth opens into a large single cavity in Hydra

A. coelom

B. enterocoel

C. pseudocoel

D. coelenteron

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Tentaculocysts in Obelia are meant for

A. locomotion

B. balancing

C. swimming

D. reproduction

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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