Body cavity is the cavity present between body wall and gut wall. In some animals the body cavity is not lined by mesoderm. Such animals are called (a) Acoelomate (b) Pseudocoelomate .
(c) Coelomate (d) Haemocoelomate
(b)
(i) Acoelomate: The animals in which the body cavity is absent are
called acoelomates, e.g.: Porifers, Coelentrates, Ctenophores and Platyhelminthes. .
(ii) Pseudocoelomate: 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. Here body cavity is directly connected to archenteron. Such a body cavity is called pseudocoelom and the animals possessing them are called pseudocoelomates. E.g.: Aschelminthes (Ascaris). Pseudocoelom is derived from blastocoel.
(iii) Coelomate: The body cavity, which is lined by mesoderm (on both sides) is called coelom. Animals possessing coelom are called coelomates, or coelom is cavity between alimentary canal and body wall enclosed by mesoderm on both sides. E.g.: Annelids, Arthropods, Molluscs, Echinoderms, Hemichordates and Chordates.
Depending upon its origin, true coelom or eucoelom is of two types:
(a) Schizocoelous: The coelom is formed by splitting of mesoderm. E.g.: Annelida, Arthropoda and Mollusca.
Note: The cavity filled with blood is called haemocoel. It is found in Arthropods (cockroach) and Molluscs (Pila).
(b) Enterocoelom: The coelom develops as an outgrowth of the enteron or embryonic gut. E.g.: Deuterostomia (Echinodermata and Chordata). Echinodermata is an enterocoelomate invertebrate.
Sort out the animals on the basis of their symmetry (radial or bilateral) coelenterates, ctenophores, annelids, arthropods, and echinoderms.
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_______
Give one example each for an animal possessing placoid scales and that with cycloid scales.
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.
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.
Identify the phylum in which adults exhibit radial symmetry and larva exhibit bilateral symmetry.
Match the following.
Animals Locomotory Organ
(a) Octopus (i) Limbs
(b) Crocodile (ii) Comb plates
(c) Catla (iii) Tentacles
(d) Ctenoplana (iv) Fins
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.
Endoparasites are found inside the host body. Mention the special structure, possessed by these and which enables them to survive in those conditions.
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 |
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
Endoparasites are found inside the host body. Mention the special structure, possessed by these and which enables them to survive in those conditions.
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)______
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 |
Give an example for the following:
a. Roundworm
b. Fish possessing poison sting
c. A limbless reptile/amphibian .
d. An oviparous mammal
Comment upon the habitats and external features of animals belonging to class, amphibia and reptilia.
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 |
How useful is the study of the nature of body cavity and coelom in the classification of animals?
Name the animal, which exhibits the phenomenon of bioluminescence. Mention the phylum to which it belongs.
Mention two similarities between:
Aves and mammals
A frog and crocodile ‘
A turtle and pila
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
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
Sort out the animals on the basis of their symmetry (radial or bilateral) coelenterates, ctenophores, annelids, arthropods, and echinoderms.
Mention two similarities between
(a) Aves and mammals
(b) A frog and crocodile
(c) A turtle and Pila
Identify the phylum in which adults exhibit radial symmetry and larva exhibit bilateral symmetry.
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_______
Match the column A with column B and choose the correct option.
| Column A | Column B | ||
| A. | Porifera | (i) | Canal system |
| B. | Aschelminthes | (ii) | Water-vascular system |
| C. | Annelida | (iii) | Muscular Pharynx |
| D. | Arthropoda | (iv) | Jointed appendages |
| E. | Echinodermata | (v) | Metamers |
Differentiate between:
a. Open circulatory system and closed circulatory system
b. Oviparous and viviparous characteristic
c. Direct development and Indirect development
Mention one example each for animals with chitinous exoskeleton and those covered by a calcareous shell.
Give an example for each of the following:
a. A viviparous animal
b. A fish possessing a poison sting
c. A fish possessing an electric organ
d. An organ, which regulates buoyancy
e. Animal, which exhibits alternation of generation
f. Oviparous animal with mammary gland.
Name the animal, which exhibits the phenomenon of bioluminescence.
Mention the phylum to which it belongs.
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.
Give the characteristic features of the following, citing one example of each:
(a) Chondrichthyes and osteichthyes
(b) Urochordata and cephalochordata
Mention one example each for animals with chitinous exoskeleton and those covered by a calcareous shell.
Match the following:
| a. | Amphibia | (i) | Air bladder |
| b. | Mammals | (ii) | Cartilagenous notochord |
| c. | Chondrichthyes | (hi) | Mammary glands |
| d. | Osteichthyes | (iv) | Pneumatic bones |
| e. | Cyclostomata | (v) | Dual habitat |
| f. | Aves | (vi) | Sucking and circular mouth without jaws |
