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Which of the following statement(s) is/are correct?
(i) Animals in which the cells are arranged in two embryonic layers, an external ectoderm and an internal endoderm, are called diploblastic animals.
(ii) Notochord is an ectodermally derived rod like structure formed on the ventral side during embryonic development in some animals.
(iii) In some animals, the body cavity is not lined by mesoderm, instead, the mesoderm is present as scattered pouches in between the ectoderm and endoderm and such a body cavity is called pseudocoelom.

A. Only (i)

B. Both (i) and (ii)

C. Both (i) and (iii)

D. All of these

Correct Answer :

C. Both (i) and (iii)


Notochord is a mesodermally derived rod like structure formed in dorsal side during embryonic development in some animals.

Related Questions

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Polyp phase is absent in

A. Hydra

B. Aurelia

C. Physalia

D. Obelia

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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

Which of the following class is being correctly described by given statements (i - iv)?
(i) All living members of this class are ectoparasites on some fishes.
(ii) They have a sucking and circular mouth without jaws.
(iii) Circulation is of closed type.
(iv) They are marine but migrate for spawning to fresh water. After spawing, within a few days they die.

A. Cyclostomata

B. Chondrichthyes

C. Osteichthyes

D. Amphibia

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4

Identify the correct characteristic feature shown by the given figure? 
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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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Few cnidarians like corals have a skeleton composed of

A. calcium hydroxide

B. calcium sulphate

C. calcium carbonate

D. sodium bicarbonate

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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

Refer the following animals and identify those which have a fluid filled body cavity with a complete lining derived from mesoderm.
(i) Sycon (ii) Butterfly
(iii) Nereis (iv) Sea fan
(v) Scorpion (vi) Pila

A. (i) and (iii) only

B. (ii) and (iv) only

C. (ii), (iii), (v) and (vi) only

D. All of these

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4

In amphibians, respiration occurs through

A. gills

B. lungs

C. skin

D. all of these

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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

Tracheae of cockroach and mammal are similar in having

A. paired nature.

B. non-collapsible walls.

C. ciliated inner lining.

D. origin from head.

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Read the following statements and answer the question.
(i) They are exclusively marine, radially symmetrical, diploblastic organisms with tissue level of organisation.
(ii) Body bears eight external rows of ciliated comb plates, which help in locomotion.
(iii) Digestion is both extracellular and intracellular.
(iv) Reproduction takes place only by sexual means.
Which of the following phylum is being described by above statements?

A. Platyhelminthes

B. Arthropoda

C. Mollusca

D. Ctenophora

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Which of the following possesses poison sting and belongs to class chondrichthyes?

A. Labeo

B. Myxine

C. Clarias

D. Trygon

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4

Which of the following is not the common fundamental feature for animal classification?

A. Germinal layers.

B. Pathway of water transport.

C. Pattern of organization of cells.

D. Serial repetition of the segments.

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4

__________ is responsible for maintaining the current of water in sponge.

A. Osculum

B. Porocytes

C. Spongocoel

D. Choanocytes

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4

Match the types of animals given in column I with their examples given in column II and choose the correct option.
Column -IColumn -II
(Types of animals)(Examples)
A. Limbless reptilesI. Elephant
B. Jawless vertebratesII. Lamprey
C. Flightless birdIII. Ichthyophis
D. LargestIV. Ostrich terrestrial animal
E. Limbless amphibiaV. Cobra

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

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

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

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

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4

Refer the following statement and answer the question. 'Name of X is derived from stinging capsules. It exhibits metagenesis containing two body forms in which sessile and cylindrical form is called Y and umbrella shaped and free swimming is called Z. Identify X, Y, and Z.

A. X - Coelenterate, Y - Polyp, Z - Medusa

B. X - Cnidarian, Y - Medusa, Z - Polyp

C. X - Ctenophora, Y - Radula, Z - Hypostome

D. X - Porifera, Y - Osculum, Z - Radula

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4

The organisms attached to the substratum generally possess

A. one single opening to the digestive canal.

B. cilia on the surface to create water current.

C. radial symmetry.

D. asymmetrical body.

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4

A student brought home a strange animal which he found outside under a rock. It had moist skin, a complete digestive tract, a ventral nerve cord, and had gone through torsion. Identify the phylum of the animal.

A. Porifera

B. Annelida

C. Mollusca

D. Echinodermata

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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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Which of the following is a chordate feature and not shared by the non-chordates ?

A. Metamerism

B. Axial organization

C. Bilateral symmetry

D. Pharyngeal gill slits

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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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Which of the following feature is not correct regarding the figure given below? 
akimg16

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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In amphibians, heart is ________ chambered.

A. two

B. three

C. four

D. none of these

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Which of the following statement is incorrect?

A. Platyhelminthes has incomplete digestive system.

B. In coelenterates, the arrangement of cells is more complex.

C. Nereis is monoecious but earthworms and leeches are dioecious.

D. Simple and compound eyes are present in the animals of those phylum whose over two-thirds of all named species on earth are arthropods.

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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

Which of the following traits is not shared by both sea anemones and jellyfish ?

A. A medusa as the dominant stage in the life cycle.

B. Possession of a gastro vascular cavity.

C. Sexual reproduction.

D. Nematocysts present on the tentacles.

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4

Which of the following animal's body is covered by calcareous shell and unsegmented with a distinct head, muscular foot, and visceral hump? 
akimg17

A. Click to check answer

B. Click to check answer

C. Click to check answer

D. Click to check answer

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The given figures of animals (A & B) are distinguished on the basis of symmetry. Select the correct option which shows the type of symmetry and its description against the animals.
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A. A : Biradial, organisms is divided into unequal halves by any plane through the central axis.

B. B: Bilateral, body is divided into equivalent right and left halves by only one plane.

C. A: Asymmetrical, organisms is not divided into equal halves by any plane through the central axis.

D. B: Radial, in which any plane passing through the central axis of the body divides the organism into two identical halves.

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4

A student was given a specimen to identify on the basis of the characteristics given below.
(i) They are metamerically segmented.
(ii) Presence of closed circulatory system.
(iii) They have circular and longitudinal muscles for locomotion. Identify the specimen.

A. Prawn

B. Pheretima

C. Wuchereria

D. Ctenoplana

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The figure given below shows the germinal layers marked as A, B, C and D. Identify the label showing undifferentiated layer and its location?
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A. A, Between B & C

B. B, Between A & C

C. C, Between C & D

D. D, Between A & B