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In ctenophora, the body bears _______ external rows of ciliated comb plates, which help in locomotion.

A. five

B. six

C. seven

D. eight

Correct Answer :

D. eight


Ctenophores are commonly known as sea-walnuts or combjellies. They are exclusively marine, radially symmetrical, diploblastic organisms with tissue level of organization. The body bears eight external rows of ciliated comb plates, which help in locomotion.

Related Questions

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4

Which of the following statements is without exception in sponges ?

A. They all have calcareous spicules.

B. They have high regenerative power.

C. They are found only in marine water.

D. They are all radially symmetrical.

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4

Column I contains zoological names of animals and column II contains their common name. Match the following and choose the correct option.
Column -IColumn- II
A. PhysaliaI. Sea anemone
B. MeandrinaII. Brain coral
C. GorgoniaIII. Sea fan
D. AdamsiaIV. Portuguese man-of-war

A. A III; B II; C I; D IV

B. A IV; B III; C II; D I

C. A IV; B II; C III; D I

D. A II; B III; C I; D IV

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4

The transition from aquatic to terrestrial lifestyles required many adaptations in the vertebrate lineage. Which of the following is not one of those adaptations ?

A. Switch from gill respiration to air-breathing lungs.

B. Improvements in water resistance of skin.

C. Alteration in mode of locomotion.

D. Development of feathers for insulation.

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4

Which of the following feature is not correct regarding the figure given below? 
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A. It is an aquatic form.

B. Circulatory system is of open type.

C. It possesses parapodia for swimming.

D. Neural system consists of paired ganglia connected by lateral nerves to a double ventral nerve cord.

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4

Which of the following class is being described by the given statements (i - iv)?
(i) They are found in a variety of habitats- polar ice-caps, deserts, mountains, forests, grasslands and dark caves.
(ii) Most unique mammalian characteristic is the presence of mammary glands by which the young ones are nourished.
(iii) Heart is four-chambered.
(iv) Sexes are separate and fertilization is internal.

A. Reptilia

B. Aves

C. Mammalia

D. Amphibia

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4

Match the characteristic feature/terms given in column I with the phylum to which they belongs given in column II and choose the correct option.
Column-IColumn-II
(Characteristic feature/term)(Phylum)
A. ChoanocytesI. Platyhelminthes
B. CnidoblastsII. Ctenophora
C. Flame cellsIII. Porifera
D. NephridiaIV. Coelenterata
E. Comb platesV. Annelida

A. A II; B I; C IV; D V; E III

B. A II; B IV; C I; D V; E III

C. A V; B I; C III; D II; E IV

D. A III; B IV; C I; D V; E II

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4

Refer the given figures A, B, C and D and identify the option which shows their correct name. 
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A. A - Pleurobrachia, B - Cnidoblast, C - Aurelia, D - Adamsia

B. A - Aurelia, B - Adamsia, C - Cnidoblast, D - Pleurobrachia

C. A - Cnidoblast, B - Pleurobrachia, C - Adamsia, D - Aurelia

D. A - Adamsia, B - Aurelia, C - Pleurobrachia, D - Cnidoblast

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4

A file like rasping organ for feeding, called radula, present in the phylum __________.

A. arthropoda

B. mollusca

C. echinodermata

D. chordata

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4

Column-I contains organisms and column-II contains their exeretory structures. Choose the correct match form the options given below.
Column- IColumn -II
(Organism)(Excretory structures)
A. CockroachI. Nephridia
B. Cat fishII. Malpighian tubules
C. EarthwormIII. Kidneys
D. BalanoglossusIV. Flame cells
E. FlatwormV. Proboscis gland

A. A I; B III; C II; D IV; E V

B. A III; B I; C II; D V; E IV

C. A II; B I; C III; D V; E IV

D. A II; B III; C I; D V; E IV

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4

In phylum echinodermata, the adult echinoderms are ______A__________ but larvae are _______B______ .

A. A radially symmetrical; B bilaterally symmetrical

B. A bilaterally symmetrical; B radially symmetrical

C. A bilaterally symmetrical; B asymmetrical

D. A metamerically segmented; B asymmetrical

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4

Identify the figures A, B and C and choose the correct option. 
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A. A - Male Ascaris, B - Hirudinaria (leech), C- Nereis

B. A - Female Ascaris, B - Nereis, C-Hirudinaria (leech)

C. A - Female Ascaris B- Hirudinaria (leech), C - Nereis

D. A - Male Ascaris, B - Nereis, C- Hirudinaria (leech)

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4

Heart is three - chambered in reptiles, except

A. turtle

B. Chameleon

C. Naja (Cobra)

D. crocodile

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4

The figure given below is the characteristic structure of the phylum in which animals are aquatic, free swimming or sessile, mostly marine, radially symmetrical. Identify the phylum and correct function of the structure. 
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A. Ctenophora; Emission of light.

B. Porifera; Feeding, respiration and excretion.

C. Cnidarian; Anchorage, Defense and food capturing

D. Mollusca; Locomotion, transport of food and respiration.

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4

Which of the following phylum is being described by the given statements?
(i) They are bilaterally symmetrical,triploblastic, segmented and coelomate animals.
(ii) The body consists of head, thorax, abdomen and have jointed appendages.
(iii) Circulatory system is of open type.
(iv) Excretion takes place through malphigian tubules.

A. Arthropoda

B. Annelida

C. Mollusca

D. Echinodermata

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4

Which of the following animal contains respiratory organs like, gills, book gills, book lungs or tracheal system? 
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A. Click to check answer

B. Click to check answer

C. Click to check answer

D. Click to check answer

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4

Which of the following sets of animals give birth to young ones?

A. Platypus, Penguin, Bat, Hippopotamus.

B. Shrew, Bat, Cat, Kiwi.

C. Kangaroo, Hedgehog, Dolphin, Loris.

D. Lion, Bat, Whale, Ostrich.

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4

The given figure shows some characteristic features marked as chordates. Identify the correct labelling A,B,C and D. 
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A. A-Notochord; B-Post-anal part; C-Gill slits; D-Nerve cord

B. A-Nerve cord; B-Notochord; C-Post-anal part; D-Gill slits

C. A-Notochord; B-Nerve cord; C-Gill slits; D-Post-anal part

D. A-Gill slits; B-Post-anal part; C-Nerve cord; D-Notochord

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4

Which of the following is not a characteristic feature of kingdom animalia ?

A. Storage of carbohydrates as starch.

B. Multicellularity.

C. Obtaining nutrients by ingestion.

D. Having eukaryotic cells without walls.

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4

Which of the following is a fresh water sponge?

A. Sycon

B. Euspongia

C. Spongilla

D. Pleurobrachia

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Which of the following possesses electric organs and belongs to class chondrichthyes?

A. Torpedo

B. Petromyzon

C. Trygon

D. Exocoetus

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4

Which of the following group of animals belongs to the same phylum?

A. Earthworm, pinworm, tapeworm

B. Prawn, scorpion, Locusta

C. Sponge, Sea anemone, starfish

D. Malarial parasite, Amoeba, mosquito

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4

Which of the following statements (i – v) are incorrect ?

  1. Circulatory system in arthropods is of closed type.

  2. Parapodia in annelids helps in swimming.

  3. Phylum mollusca is the second largest animal phylum.

  4. Aschelminthes are dioecious.

A. (i) only

B. (iii) only

C. (i) and (iii)

D. (iii) and (iv)

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4

In amphibians, heart is ________ chambered.

A. two

B. three

C. four

D. none of these

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Identify the correct characteristic feature shown by the given figure? 
akimg19

A. Diploblastic in nature.

B. Having radial symmetrical body.

C. Dioecious with direct development.

D. Presence of sensory tentacles on anterior head region.

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4

Which of the following is an incorrect statement regarding flatworms ?

A. They are acoelomates.

B. They are bilaterally symmetrical.

C. They lack a digestive system.

D. They have a circulatory system.

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4

Which of the following is a poisonous snake?

A. Naja (Cobra)

B. Bangarus (Krait)

C. Viper (Viper)

D. All of these

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Which one of the following categories of animals is correctly described with no single exception in it?

A. In chondrichthyes notochord is persistent throughout life.

B. All mammals are viviparous and possess diaphragm for breathing.

C. All sponges are marine.

D. All reptiles possess scales, have a three chambered heart and are cold blooded (poikilothermal).

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Identify the figure with its correct name and phylum. 
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A. Sycon - Porifera

B. Aurelia - Coelenterata

C. Pleurobrachia - Ctenophora

D. Tapeworm - Platyhelminthes

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In amphibians, respiration occurs through

A. gills

B. lungs

C. skin

D. all of these

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Which of the following is not a characteristic of phylum echinodermata ?

A. They have a water vascular system.

B. They have an internal skeleton.

C. They are protostomes.

D. They have bilateral symmetry at larval stage.