The figure given below shows the germinal layers marked as A, B, C and D. Identify the label showing undifferentiated layer and its location?
A, Between B & C
B, Between A & C
C, Between C & D
D, Between A & B
Correct Answer :
A. A, Between B & C
Germinal layers marked as A, B, C and D is mesoglea, ectoderm, endoderm and mesoderm respectively. A label represent Mesoglea layer, which is undifferentiated and present in between the ectoderm (B) and the endoderm (C).
Related Questions
In amphibians, heart is ________ chambered.
two
three
four
none of these
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 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.
Reptilia
Aves
Mammalia
Amphibia
Which of the following animal contains respiratory organs like, gills, book gills, book lungs or tracheal system?
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Which of the following statement(s) is/are correct regarding phylum coelenterata?
(i) They are aquatic, mostly marine, sessile or freeswimming, radially symmetrical animals.
(ii) They have a central gastro-vascular cavity with a single opening called hypostome.
(iii) Digestion is extracellular and intracellular.
(iv) Examples are Sycon, Spongilla and Euspongia.
(i) and (ii)
(i) and (iv)
(i), (ii) and (iii)
All of these
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 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 is a chordate feature and not shared by the non-chordates ?
Metamerism
Axial organization
Bilateral symmetry
Pharyngeal gill slits
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
A file like rasping organ for feeding, called radula, present in the phylum __________.
arthropoda
mollusca
echinodermata
chordata
Which of the following statement(s) is/are correct regarding phylum mollusca?
They are bilaterally symmetrical, triploblastic and coelomate animals.
Body is covered by a calcareous shell and is unsegmented with a distinct head, muscular foot and visceral hump.
The mouth contains a file-like rasping organ for feeding, called radula.
All of the above
Which of the following animals are bilaterally symmetrical?
1 & 2
2 & 4
3 & 4
1 & 3
Match the features given in column I with their examples given in column II and choose the correct match from the option given below.
| Column-I | Column-II |
|---|---|
| (Features) | (Examples) |
| A. Pseudocoelomates | a. Hydra, Adamsia |
| B. Diploblastic | b. Ctenoplana, Aurelia |
| C. Cellular level of | c. Ascaris, Wuchereria organization |
| D. Radial symmetry | d. Sycon, Spongilla |
| E. Metamerism | e. Pheretima, Neries |
A - e, B - b, C - d, D - c, E - a
A - c, B - a, C - d, D - b, E - e
A - b, B - a, C - c, D - e, E - d
A - c, B - b, C - d, D - a, E - e
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.
Few cnidarians like corals have a skeleton composed of
calcium hydroxide
calcium sulphate
calcium carbonate
sodium bicarbonate
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
Heart is three - chambered in reptiles, except
turtle
Chameleon
Naja (Cobra)
crocodile
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.
Match the organisms given in column-I with their common name given in column-II and choose the correct option.
| Column -I | Column -II |
|---|---|
| (Organisms) | (Comman name) |
| A. Pennatula | I. Sea-lily |
| B. Antedon | II. Sea- pen |
| C. Echinus | III. Sea-urchin |
| D. Cucumaria | IV. Sea - cucumber |
A II; C III; D I; E IV
A II; C IV; D I; E III
A II; C I; D III; E IV
A II; C I; D III; E IV
Which of the following group of animals belongs to the same phylum?
Earthworm, pinworm, tapeworm
Prawn, scorpion, Locusta
Sponge, Sea anemone, starfish
Malarial parasite, Amoeba, mosquito
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
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.
Ctenophora; Emission of light.
Porifera; Feeding, respiration and excretion.
Cnidarian; Anchorage, Defense and food capturing
Mollusca; Locomotion, transport of food and respiration.
Which of the following possesses electric organs and belongs to class chondrichthyes?
Torpedo
Petromyzon
Trygon
Exocoetus
Identify the figure with its correct name and phylum.
Cucumaria – Echinodermata
Ascidia – Urochordata
Balanoglossus – Hemichordata
Hirudinaria – Annelida
Which of the following is a fresh water sponge?
Sycon
Euspongia
Spongilla
Pleurobrachia
The given figure shows some characteristic features marked as chordates. Identify the correct labelling A,B,C and D.
A-Notochord; B-Post-anal part; C-Gill slits; D-Nerve cord
A-Nerve cord; B-Notochord; C-Post-anal part; D-Gill slits
A-Notochord; B-Nerve cord; C-Gill slits; D-Post-anal part
A-Gill slits; B-Post-anal part; C-Nerve cord; D-Notochord
Which of the following statements (i v) are incorrect?
(i) Parapodia are lateral appendages in arthropods used for swimming.
(ii) Radula in molluscs are structures involved in excretion.
(iii) Aschelminthes are dioecious.
(iv) Echinoderm adults show radial symmetry.
(v) Ctenophorans are diploblastic.
(i) and (ii)
(i) and (iii)
(i), (iv) and (v)
(iii) and (v)
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.
Identify the animals shown in the given figures A, B and C from options given below.
A - Octopus; B -Asterias, C- Ophiura
A - Asterias; B - Ophiura, C- Octopus
A - Echinus; B - Octopus C - Ophiura
A - Ophiura; B - Echinus, C- Octopus
The given figures A, B, C and D are the examples of first true land vertebrates. They are dominant in mesozoic era and belong to phylum ‘X’. Identify ‘X’ and the animals which have four chambered heart.
X – Reptile; B
X – Reptile; A
X – Amphibia, C
X – Pisces; D