Which of the following possesses electric organs and belongs to class chondrichthyes?
Torpedo
Petromyzon
Trygon
Exocoetus
Correct Answer :
A. Torpedo
Animals that belong to class chondrichthyes are marine with streamlined body and have cartilaginous endoskeleton. Some of them have electric organs (e.g., Torpedo) and some possess poison sting (e.g., Trygon).
Related Questions
A common characteristic of all vertebrates without exception is
the division of body into head, neck, trunk and tail.
body covered with exoskeleton.
the possession of two pairs of functional appendages.
the presence of well- developed skull.
Which of the following character is absent in all chordates?
Diaphragm
Coelom
Pharyngeal gill clefts
Dorsal nerve cord
Which of the following belong to phylum arthropoda?
Bombyx and Apis
Laccifer and Anopheles
Locusta and Limulus
All of the above
Which of the following pairs of animals comprises jawless fishes?
Mackerals and rohu
Lampreys and hag fishes
Guppies and hag fishes
Lampreys and eels
Which of the following is a connecting link between invertebrates and non-invertebrates?
Sphenodon
Balanoglossus
Tadpole larva
Crocodile
The given figures (A & B) shows the germinal layer. The animals having structures shown in the figures are respectively called
diploblastic, triploblastic
triploblastic, diploblastic
diploblastic, diploblastic
triploblastic, triploblastic
Which of the following sets of animals give birth to young ones?
Platypus, Penguin, Bat, Hippopotamus.
Shrew, Bat, Cat, Kiwi.
Kangaroo, Hedgehog, Dolphin, Loris.
Lion, Bat, Whale, Ostrich.
Which one of the following features is common in silverfish, scorpion, dragonfly and prawn?
Three pairs of legs and segmented body.
Chitinous cuticle and two pairs of antennae.
Jointed appendages and chitinous exoskeleton.
Cephalothorax and tracheae.
Which one of the following statement regarding coelom of given animals is correct?
Round worms (aschelminthes) are pseudocoelomates.
Molluscs are acoelomates.
Insects are pseudocoelomates.
Flatworms (platyhelminthes) are coelomates.
Refer the types of cells present in some animals. Each cell is specialized to perform a single specific function except
Cnidocytes
Choanocytes
Interstitial cells
Gastrodermal cells
Aquatic annelids (like Nereis) possess lateral appendages called ______________, which help in swimming.
visceral hump
parapodia
radula
spicules
Hemichordates have now been placed with the nonchordates, close to echinoderms, because true
notochord is absent.
pharyngeal gill-slits are lacking.
dorsal nerve cord is absent.
heart is lacking.
Match the types of animals given in column I with their examples given in column II and choose the correct option.
| Column -I | Column -II |
|---|---|
| (Types of animals) | (Examples) |
| A. Limbless reptiles | I. Elephant |
| B. Jawless vertebrates | II. Lamprey |
| C. Flightless bird | III. Ichthyophis |
| D. Largest | IV. Ostrich terrestrial animal |
| E. Limbless amphibia | V. Cobra |
A II; B V; C IV; D I; E III
A V; B II; C IV; D I; E III
A V; B II; C I; D IV; E III
A V; B IV; C II; D I; E III
Identify the figure with its correct name and phylum.
Cucumaria – Echinodermata
Ascidia – Urochordata
Balanoglossus – Hemichordata
Hirudinaria – Annelida
Which of the following statement is incorrect?
Platyhelminthes has incomplete digestive system.
In coelenterates, the arrangement of cells is more complex.
Nereis is monoecious but earthworms and leeches are dioecious.
Simple and compound eyes are present in the animals of those phylum whose over two-thirds of all named species on earth are arthropods.
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.
Prawn
Pheretima
Wuchereria
Ctenoplana
Column I contains zoological names of animals and column II contains their common name. Match the following and choose the correct option.
| Column -I | Column- II |
|---|---|
| A. Physalia | I. Sea anemone |
| B. Meandrina | II. Brain coral |
| C. Gorgonia | III. Sea fan |
| D. Adamsia | IV. Portuguese man-of-war |
A III; B II; C I; D IV
A IV; B III; C II; D I
A IV; B II; C III; D I
A II; B III; C I; D IV
Which of the following statement(s) is/are correct regarding phylum aschelminthes?
(i) The body is circular in cross-section hence the name roundworms.
(ii) Alimentary canal is complete with a well-developed muscular pharynx.
(iii) Sexes are separate (dioecious), i.e., males and females are distinct.
(iv) Nephridia help in osmoregulation and excretion.
(i) and (ii)
(iii) and (iv)
(i), (ii) and (iii)
All of these
In phylum arthropoda, excretion takes place through
nephridia
flame cells
malphigian tubules
gills
Which of the following is a fresh water sponge?
Sycon
Euspongia
Spongilla
Pleurobrachia
Identify the figure with its correct name and phylum.
Sycon - Porifera
Aurelia - Coelenterata
Pleurobrachia - Ctenophora
Tapeworm - Platyhelminthes
Which of the following animals are bilaterally symmetrical?
1 & 2
2 & 4
3 & 4
1 & 3
Which of the following is not a characteristic of phylum echinodermata ?
They have a water vascular system.
They have an internal skeleton.
They are protostomes.
They have bilateral symmetry at larval stage.
When any plane passing through the central axis of the body divides the organism into two identical halves, the organism is called ___________.
radially symmetrical
bilaterally symmetrical
asymmetrical
metamerically segmented
Which one of the following categories of animals is correctly described with no single exception in it?
In chondrichthyes notochord is persistent throughout life.
All mammals are viviparous and possess diaphragm for breathing.
All sponges are marine.
All reptiles possess scales, have a three chambered heart and are cold blooded (poikilothermal).
Which one of the following groups of animals is correctly matched with its characteristic feature without even a single exception ?
Reptilia : possess 3 - chambered heart with one incompletely divided ventricle.
Chordata : Possess a mouth provided with an upper and lower jaw.
Chondrichthyes : Possess cartilaginous endoskeleton.
Mammalia : Give birth to young one.
Which of the following is a chordate feature and not shared by the non-chordates ?
Metamerism
Axial organization
Bilateral symmetry
Pharyngeal gill slits
Which of the following statement(s) is/are correct regarding class aves?
(i) The forelimbs are modified into wings and the hindlimbs generally have scales and are modified for walking, swimming or clasping the tree branches.
(ii) Heart is completely four-chambered.
(iii) They are warm- blooded (homoiothermous) animals i.e., they are able to maintain a constant body temperature.
(iv) They are oviparous and development is direct.
Both (i) and (iii)
Both (i) and (iv)
(i), (ii) and (iii)
All of these
Which of the following characteristic distinguish arthropoda from annelids and molluscs ?
An external skeleton made of chitin (a polysaccharide) and protein rather than a shell made chiefly of mineral salts.
Subdivision of the legs into movable segments.
Distinct group of muscles, derived from many body segments, that move the separate parts of the exoskeleton.
All of the above
Match the phylum given in column - I with the special features present in them given in column - II and choose the correct option.
| Column -I | Column- II |
|---|---|
| (Phylum) | (Special features present) |
| A. Porifera | I. Mammary glands |
| B. Mollusca | II. Cloaca |
| C. Ctenophora | III. Choanocytes |
| D. Amphibia | IV. Radula |
| E. Mammalia | V. Comb plates |
A III; B IV; C V; D II; E I
A IV; B III; C V; D II; E I
A III; B IV; C II; D V; E I
A III; B V; C IV; D II; E I