How useful is the study of the nature of body cavity and coelom in the classification of animals?
Organisms can be classified according to presence or absence of the coelom. The body cavity, which is lined by mesoderm is called coelom. Animals possessing coelom are called coelomates, e.g., annelids, molluscs, arthropods, echinoderms, hemichordates and chordates. 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. Such a body cavity is called pseudocoelom and the animals possessing them are called pseudocoelomates, e.g., aschelminthes. In pseudocoelomates, body cavity is derived from blastocoel of the embryo. The animals in which the body cavity is absent are called acoelomates, e.g., platyhelminthes.
Sort out the animals on the basis of their symmetry (radial or bilateral) coelenterates, ctenophores, annelids, arthropods, and echinoderms.
Give one example each for an animal possessing placoid scales and that with cycloid scales.
Write one example each of the following in the space provided.
(a) Cold blooded animal_______
(b) Warm blooded animal_______
(c) Animal possessing dry and cornified skin_______
(d) Dioecious animal_______
There has been an increase in the number of chambers in heart during evolution of vertebrates. Give the names of the class of vertebrates having two, three or four-chambered heart.
There has been an increase in the number of chambers in heart during evolution of vertebrates. Give the names of the class of vertebrates having two, three or four-cham-bered heart.
Match the following.
Animals Locomotory Organ
(a) Octopus (i) Limbs
(b) Crocodile (ii) Comb plates
(c) Catla (iii) Tentacles
(d) Ctenoplana (iv) Fins
Identify the phylum in which adults exhibit radial symmetry and larva exhibit bilateral symmetry.
Match the following list of animals with their level of organization.
| Division of Labour | Animal | ||
| A. | Organ level | (i) | Pheretima |
| B. | Cellular aggregate level | (ii) | Fasciola |
| C. | Tissue level | (iii) | Spongilla |
| D. | Organ system level | (iv) | Obelia |
Choose the correct match showing division of labour with animal example.
Match the following and write correct choice in space provided.
| Animal | Characteristics | ||
| a. | Pila | (i) | Jointed appendages |
| b. | Cockroach | (ii) | Perching |
| c. | Asterias | . (iii) | Water vascular system |
| d. | Torpedo | (iv) | Electric organ |
| e. | Parrot | (v) | Presence of shell |
| f. | Dog fish | (vi) | Placoid scales |
Endoparasites are found inside the host body. Mention the special structure, possessed by these and which enables them to survive in those conditions.
Could the number of eggs or young ones produced by an oviparous and viviparous mother be equal? Why?
Name
(a) A limbless animal
(b) A cold blooded animal
(c) A warm blooded animal
(d) An animal possessing dry and cornified skin
(e) An animal having canal system and spicules
(f) An animal with cnidoblasts
Match the following and write correct choice in space provided
Animal Characteristics
(a) Pila (i) Jointed appendages
(b) Cockroach (ii) Perching
(c) Asterias (iii) Water vascular system
(d) Torpedo (iv) Electric organ
(e) Parrot (v) Presence of shell
(f) Dogfish (vi) Placoidscales
(a)______, (b)______, (c)______, (d)______,
(e)______, (f)______
Endoparasites are found inside the host body. Mention the special structure, possessed by these and which enables them to survive in those conditions.
Fill up the blank spaces appropriately.
|
Phylum/ Class |
Excretory Organ |
Circulatory Organ |
Respiratory Organ |
| Arthropoda | A | B . | Lungs/Gills/ Tracheal System |
| C | Nephridia | Closed | Skin/Parapodia |
| D | Metanephridia | Open | E |
| Amphibia | F | Closed | Lung |
Name
a. A limbless animal ‘
b. A cold blooded animal
c. A warm blooded animal
d. An animal possessing dry and comified skin
e. An animal having canal system and spicules
f. An animal with cnidoblasts
All vertebrates are chordates but all chordates are not vertebrates”. Justify the statement.
Excretory organs of different animals are given below. Choose correctly and write in the space provided.
| Animal | Excetory Organ/Unit | ||
| a. | Balanoglossus | (i) | Metanephridia |
| b. | Leech | (ii) | Nephridia |
| c. | Locust | (iii) | Flame cells |
| d. | Liver fluke | (iv) | Absent |
| e. | Sea urchin | (v) | Malpighian tubule |
| f. | Pila | (vi) | Proboscis gland |
Mention one example each for animals with chitinous exoskeleton and those covered by a calcareous shell.
How useful is the study of the nature of body cavity and coelom in the classification of animals?
Differentiate between:
a. Open and closed circulatory system .
b. Oviparity and viviparity
c. Direct and indirect development
d. Aceolomate and pseudocoelomate
e. Notochord and nerve cord
f. Polyp and medusa
Provide appropriate technical term in the space provided.
(a) Blood-filled cavity in arthropods_______
(b) Free-floating form of cnidaria_______
(c) Stinging organ of jelly fishes_______
(d) Lateral appendages in aquatic annelids_______
Give an example for the following:
a. Roundworm
b. Fish possessing poison sting
c. A limbless reptile/amphibian .
d. An oviparous mammal
Sort out the animals on the basis of their symmetry (radial or bilateral) coelenterates, ctenophores, annelids, arthropods, and echinoderms.
Match the following
(a) Amphibia (i) Air bladder
(b) Mammals (ii) Cartilaginous notochord
(c) Chondrichthyes (iii) Mammary glands
(d) Osteichthyes (iv) Pneumatic bones
(e) Cyclostomata (v) Dual habitat
(f) Aves (vi) Sucking and circular mouth without jaws.
Mention two similarities between
(a) Aves and mammals
(b) A frog and crocodile
(c) A turtle and Pila
Comment upon the habitats and external features of animals belonging to class, amphibia and reptilia.
Name the animal, which exhibits the phenomenon of bioluminescence. Mention the phylum to which it belongs.
What are the reasons that you can think of for the arthropods to constitute the largest group of the animal kingdom?
Mention one example each for animals with chitinous exoskeleton and those covered by a calcareous shell.
Give the characteristic features of the following, citing one example of each:
(a) Chondrichthyes and osteichthyes
(b) Urochordata and cephalochordata
Write one example each of the following in the space provided.
a. Cold blooded animal
b. Warm blooded animal
c. Animal possessing dry and comified skin
d. Dioecious animal
