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
Correct Answer :
C. (i), (iii) and (iv)
The digestive system of platyhelminthes is incomplete. A complete digestive system has two openings, mouth and anus.
Related Questions
The transition from aquatic to terrestrial lifestyles required many adaptations in the vertebrate lineage. Which of the following is not one of those adaptations ?
Switch from gill respiration to air-breathing lungs.
Improvements in water resistance of skin.
Alteration in mode of locomotion.
Development of feathers for insulation.
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.
Which of the following statements (i – v) are incorrect ?
- Circulatory system in arthropods is of closed type.
- Parapodia in annelids helps in swimming.
- Phylum mollusca is the second largest animal phylum.
- Aschelminthes are dioecious.
(i) only
(iii) only
(i) and (iii)
(iii) and (iv)
Which of the following traits is not shared by both sea anemones and jellyfish ?
A medusa as the dominant stage in the life cycle.
Possession of a gastro vascular cavity.
Sexual reproduction.
Nematocysts present on the tentacles.
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.
Cyclostomata
Chondrichthyes
Osteichthyes
Amphibia
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
Flame cells present in platyhelminthes, are specialized in
respiration and absorption.
osmoregulation and circulation.
respiration and excretion.
osmoregulation and excretion.
Which of the following characteristics is correct for reptilia?
Body covered with dry and cornified skin, scales over the body are epidermal, they do not have external ears.
Body is covered with moist skin and is devoid of scales, the ear is represented by a tympanum, alimentary canal, urinary and reproductive tracts open into a common cloaca.
Fresh water animals with bony endoskeleton and airbladder regulate buoyancy.
Marine animals with cartilaginous endoskeleton and body is covered with placoid scales.
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?
Platyhelminthes
Arthropoda
Mollusca
Ctenophora
Which of the following is not the common fundamental feature for animal classification?
Germinal layers.
Pathway of water transport.
Pattern of organization of cells.
Serial repetition of the segments.
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 possesses electric organs and belongs to class chondrichthyes?
Torpedo
Petromyzon
Trygon
Exocoetus
Identify the figures A, B and C and choose the correct option.
A - Male Ascaris, B - Hirudinaria (leech), C- Nereis
A - Female Ascaris, B - Nereis, C-Hirudinaria (leech)
A - Female Ascaris B- Hirudinaria (leech), C - Nereis
A - Male Ascaris, B - Nereis, C- Hirudinaria (leech)
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
Which of the following statements is incorrect ?
Prawn has two pairs of antennae.
Nematocysts are characteristic feature of the phylum cnidaria.
Millipedes have two pairs of appendages in each segment of the body.
Animals that belong to phylum porifera are exclusively marine.
Meandrina (brain coral) belongs to phylum
porifera
coelenterata
ctenophora
platyhelminthes
In phylum arthropoda, excretion takes place through
nephridia
flame cells
malphigian tubules
gills
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.
A : Biradial, organisms is divided into unequal halves by any plane through the central axis.
B: Bilateral, body is divided into equivalent right and left halves by only one plane.
A: Asymmetrical, organisms is not divided into equal halves by any plane through the central axis.
B: Radial, in which any plane passing through the central axis of the body divides the organism into two identical halves.
Which of the following statements is without exception in sponges ?
They all have calcareous spicules.
They have high regenerative power.
They are found only in marine water.
They are all radially symmetrical.
Which of the following is an incorrect statement regarding flatworms ?
They are acoelomates.
They are bilaterally symmetrical.
They lack a digestive system.
They have a circulatory system.
In which of the phylum, excretory organ like proboscis gland is present?
Hemichordata
Chordata
Echinodermata
Annelida
Which of the following phylum is being described by the given statements?
(i) These are primitive multicellular animals and have cellular level of organization.
(ii) Digestion is intracellular.
(iii) They have a water transport or canal system.
(iv) They reproduce asexually by fragmentation and sexually by formation of gametes.
Porifera
Ctenophora
Coelenterata
Platyhelminthes
A file like rasping organ for feeding, called radula, present in the phylum __________.
arthropoda
mollusca
echinodermata
chordata
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.
Arthropoda
Annelida
Mollusca
Echinodermata
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-I | Column-II |
|---|---|
| (Characteristic feature/term) | (Phylum) |
| A. Choanocytes | I. Platyhelminthes |
| B. Cnidoblasts | II. Ctenophora |
| C. Flame cells | III. Porifera |
| D. Nephridia | IV. Coelenterata |
| E. Comb plates | V. Annelida |
A II; B I; C IV; D V; E III
A II; B IV; C I; D V; E III
A V; B I; C III; D II; E IV
A III; B IV; C I; D V; E II
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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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
Refer the given figures A, B, C and D and identify the option which shows their correct name.
A - Pleurobrachia, B - Cnidoblast, C - Aurelia, D - Adamsia
A - Aurelia, B - Adamsia, C - Cnidoblast, D - Pleurobrachia
A - Cnidoblast, B - Pleurobrachia, C - Adamsia, D - Aurelia
A - Adamsia, B - Aurelia, C - Pleurobrachia, D - Cnidoblast
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 is a correct match of a phylum with their three examples?
PlatyhelminthesPlanaria, Schistosoma, Enterobius
Mollusca Loligo, Sepia, Octopus
Porifera Spongilla, Euplectella, Pennatula
Cnidaria Bonellia, Physalia, Aurelia