Attain complex body shapes and thus locomote more precisely.
Move through loose marine sediments.
Be hermaphroditic.
Inject paralytic poisons into their prey.
A. Attain complex body shapes and thus locomote more precisely.
A and B
A and C
B and C
All of the above.
one single opening to the digestive canal.
cilia on the surface to create water current.
radial symmetry.
asymmetrical body.
notochord is absent.
pharyngeal gill-slits are lacking.
dorsal nerve cord is absent.
heart is lacking.
A radially symmetrical; B bilaterally symmetrical
A bilaterally symmetrical; B radially symmetrical
A bilaterally symmetrical; B asymmetrical
A metamerically segmented; B asymmetrical
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
X – Reptile; B
X – Reptile; A
X – Amphibia, C
X – Pisces; D
Pteropus and Ornithorhyncus - Viviparity
Garden lizard and crocodile - Three chambered heart
Ascaris and Ancylostoma - Metameric segmentation
Sea horse and flying fish - Cold blooded (poikilothermal)
Switch from gill respiration to air-breathing lungs.
Improvements in water resistance of skin.
Alteration in mode of locomotion.
Development of feathers for insulation.
radially symmetrical
bilaterally symmetrical
asymmetrical
metamerically segmented
Arthropoda
Annelida
Mollusca
Echinodermata
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.
Cnidocytes
Choanocytes
Interstitial cells
Gastrodermal cells
Round worms (aschelminthes) are pseudocoelomates.
Molluscs are acoelomates.
Insects are pseudocoelomates.
Flatworms (platyhelminthes) are coelomates.
Presence of paired pharyngeal gill slits
Ventral heart
Solid and ventral nerve cord
Presence of post-anal tail
Diploblastic in nature.
Having radial symmetrical body.
Dioecious with direct development.
Presence of sensory tentacles on anterior head region.
(i) and (ii)
(iii) and (iv)
(i), (ii) and (iii)
All of these
respiration and absorption.
osmoregulation and circulation.
respiration and excretion.
osmoregulation and excretion.
Balanoglossus
Echinus
Ancylostoma
Limulus
five
six
seven
eight
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
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.
Three pairs of legs and segmented body.
Chitinous cuticle and two pairs of antennae.
Jointed appendages and chitinous exoskeleton.
Cephalothorax and tracheae.
Sphenodon
Balanoglossus
Tadpole larva
Crocodile
A - Octopus; B -Asterias, C- Ophiura
A - Asterias; B - Ophiura, C- Octopus
A - Echinus; B - Octopus C - Ophiura
A - Ophiura; B - Echinus, C- Octopus
Metamerism
Axial organization
Bilateral symmetry
Pharyngeal gill slits
Attain complex body shapes and thus locomote more precisely.
Move through loose marine sediments.
Be hermaphroditic.
Inject paralytic poisons into their prey.
Hydra
Aurelia
Physalia
Obelia
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.
Reptilia
Aves
Mammalia
Amphibia
1 & 2
2 & 4
3 & 4
1 & 3