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4

Hydra is negatively chemotropic because it

A. prefers weak light

B. moves away from strong light

C. avoids chlorinated water

D. moves to water of low temperature

Correct Answer :

C. avoids chlorinated water


Related Questions

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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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The tentacles of Hydra are

A. pinnate

B. hollow

C. solid

D. frilled

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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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A coelentrate, commonly known as fresh water polyp is

A. Hydra

B. Obelia

C. Physalia

D. Acerelia

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Ctenophores generally exhibit

A. bilateral symmetry

B. radial symmetry

C. asymmetry

D. spherical symmetry

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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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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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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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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 body of Hydra is

A. asymmetrical

B. bilaterally symmetrical

C. radially symmetrical

D. irregular

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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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The scientific name of organ pipe coral is

A. Tubipora

B. Astrangia

C. Meandra

D. Aeropora

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Hydra respires through

A. mesoglea

B. general surface

C. pellicle

D. gastrodermis

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Nematocytes are the specialised cells found in the members of the phylum

A. porifera

B. coelentrata

C. annelida

D. platyhelminthes

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In jelly fishes, the adult is always

A. polypoid

B. medusoid

C. polymorphic

D. hydroid

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Hydra responds to a strong mechanical stimulus such as agitating the surface of water by

A. somersaulting

B. contracting a part or whole of its body

C. walking away

D. looping

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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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Brain coral is

A. Fungia

B. Hydra

C. Meandria

D. Tubipora

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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 is negatively chemotropic because it

A. prefers weak light

B. moves away from strong light

C. avoids chlorinated water

D. moves to water of low temperature

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Strobilization is the characteristic feature of

A. Aurelia

B. Hydra

C. Metridium

D. Physalia

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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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Division of labour on morphological basis is well exemplified by

A. Hydra

B. Obelia

C. Monkey

D. Elephant

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

A. Earthworm

B. Hydra

C. Amoeba

D. Cockroach

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Which one is found in Hydra

A. Metabolism

B. Metamerism

C. Melting

D. Metamorphosis

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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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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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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 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