Which of the following animal's body is covered by calcareous shell and unsegmented with a distinct head, muscular foot, and visceral hump?
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Correct Answer :
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Octopus belongs to mollusca. Body of octopus is covered by calcareous shell and unsegmented with a distinct head, muscular foot, and visceral hump.
Related Questions
Which of the following feature is not correct regarding the figure given below?
It is an aquatic form.
Circulatory system is of open type.
It possesses parapodia for swimming.
Neural system consists of paired ganglia connected by lateral nerves to a double ventral nerve cord.
Which of the following character is absent in all chordates?
Diaphragm
Coelom
Pharyngeal gill clefts
Dorsal nerve cord
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 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.
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
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
Which of the follwoing statement(s) is/are correct?
(i) Organ systems in different group of animals show various patterns of complexities.
(ii) The digestive system in platyhelminthes has only a single opening to the outside of the body that serve as both mouth and anus, and is hence called complete.
(iii) In open type of circulatory system, the blood is pumped out of the heart and the cells and tissues are directly bathed in it.
(iv) In closed type, the blood is circulated through a series of vessels of varying diameters (arteries, veins and capillaries).
Only (i)
Both (ii) and (iii)
(i), (iii) and (iv)
All of these
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.
X - Coelenterate, Y - Polyp, Z - Medusa
X - Cnidarian, Y - Medusa, Z - Polyp
X - Ctenophora, Y - Radula, Z - Hypostome
X - Porifera, Y - Osculum, Z - Radula
In phylum echinodermata, the adult echinoderms are ______A__________ but larvae are _______B______ .
A radially symmetrical; B bilaterally symmetrical
A bilaterally symmetrical; B radially symmetrical
A bilaterally symmetrical; B asymmetrical
A metamerically segmented; B asymmetrical
The organisms attached to the substratum generally possess
one single opening to the digestive canal.
cilia on the surface to create water current.
radial symmetry.
asymmetrical body.
Identify the figures and select the correct option
A - Pseudocoelomate; B - Coelomate, C-Acoelomate
A - Coelomate, B - Pseudocoelomate, C- Acoelomate
A - Coelomate; B- Acoelomate; C - Pseudocoelomate
A - Coelomate; B- Acoelomate; C-Eucoelomate
Identify the figure with its correct name and phylum.
Cucumaria – Echinodermata
Ascidia – Urochordata
Balanoglossus – Hemichordata
Hirudinaria – Annelida
Polyp phase is absent in
Hydra
Aurelia
Physalia
Obelia
Meandrina (brain coral) belongs to phylum
porifera
coelenterata
ctenophora
platyhelminthes
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.
Only (i)
Both (i) and (ii)
Both (i) and (iii)
All of these
Which of the following group of animals reproduces only by sexual means?
Ctenophora
Cnidaria
Porifera
Protozoa
The combination of a true coelom and repeating body segmentation allows the annelids (unlike the anatomically simpler worms) to do which of the following?
Attain complex body shapes and thus locomote more precisely.
Move through loose marine sediments.
Be hermaphroditic.
Inject paralytic poisons into their prey.
Which of the following statement(s) is/are correct for class amphibia?
(i) Body is divisible into head and trunk.
(ii) Respiration is through gills only.
(iii) The heart is two chambered i.e. one auricle and one ventricle.
(iv) Fertilization is internal.
Only (i)
Only (iv)
(i), (ii) and (iii)
All of these
Which of the following characteristic is probably most responsible for the great diversification of insects on land ?
Segmentation
Antennae
Bilateral symmetry
Exoskeleton
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 animal's body is covered by calcareous shell and unsegmented with a distinct head, muscular foot, and visceral hump?
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Tracheae of cockroach and mammal are similar in having
paired nature.
non-collapsible walls.
ciliated inner lining.
origin from head.
Match the phylum given in column - I with their example given in column - II and choose the correct option.
| Column -I | Column- II |
|---|---|
| (Phylum) | (Examples) |
| A. Echinodermata | I. Ascidia, Doliolum |
| B. Hemichordata | II. Asterias, Ophiura |
| C. Urochordata | III. Branchiostoma |
| D. Cephalochordata | IV. Balanoglossus, Saccoglossus |
A IV; B II; C I; D III
A II; B IV; C I; D III
A II; B IV; C III; D I
A II; B I; C IV; D III
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
Refer the figures A, B and C and choose the correct option which shows animals that regulate buoyancy with the help of air bladder.
A and B
A and C
B and C
All of the above.
In phylum arthropoda, excretion takes place through
nephridia
flame cells
malphigian tubules
gills
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
Which of the following pairs of animals are similar to each other pertaining to the feature stated against them?
Pteropus and Ornithorhyncus - Viviparity
Garden lizard and crocodile - Three chambered heart
Ascaris and Ancylostoma - Metameric segmentation
Sea horse and flying fish - Cold blooded (poikilothermal)
Examine the figures A, B and C. In which one of the four options all the items A, B and C are correctly identified ?
A - Sycon, B - Euspongia, C - Spongilla
A - Euspongia, B - Spongilla, C - Sycon
A - Spongilla, B - Sycon, C - Euspongia
A - Euspongia, B - Sycon, C - Spongilla
Select the incorrect feature of mollusca from the given statements.
- Terrestrial or aquatic animals having cellular system level of organization.
- Radial symmetrical and acoelomate animals and possesses two germinal layers.
- A file like rasping organ called radula is present.
- Usually dioecious and viviparous animals.
- Examples include Pila, Octopus, and Dentalium.
(i) and (ii) only
(ii) and (iv) only
(i), (ii) and (iv) only
All the five statements.