Students get through the TN Board 11th Bio Zoology Important Questions Chapter 2 Kingdom Animalia which is useful for their exam preparation.

TN State Board 11th Bio Zoology Important Questions Chapter 2 Kingdom Animalia

Answer the following.

Question 1.
Define levels of Organization.
All members of Kingdom Animalia are metazoans (multicellular animals) and exhibit different patterns of cellular organization. The cells of the metazoans are not capable of independent existence and exhibit division of labour. Among the metazoans, cells may be functionally isolated, or similar kinds of cells may be grouped together to form tissues, organ, and organ systems.

Question 2.
Name the layers of cells found in sponges.
In sponges, the outer layer is formed of pinacocytes (plate-like cells that maintain the size and structure of the sponge) and the inner layer is formed of choanocytes. These are flagellated collar cells that create and maintain water flow through the sponge thus facilitating respiratory and digestive functions.

Question 3.
What is the tissue level of Organization?
In some animals, cells that perform similar functions are aggregated to form tissues. The cells of a tissue integrate in a highly coordinated fashion to perform a common function, due to the presence of nerve cells and sensory cells. This tissue level of organization is exhibited in diploblastic animals like cnidarians. The formation of tissues is the first step towards the evolution of body plan in animals (Hydra – Coelenterata).

TN Board 11th Bio Zoology Important Questions Chapter 2 Kingdom Animalia

Question 4.
What is the organ level of the Organization from which level of animals show this type of Organization?
Different kinds of tissues aggregate to form an organ to perform a specific function. Organ, level of organization is a further advancement over the tissue level of organization and appears for the first time in the Phylum Platyhelminthes and seen in other higher phyla.

Question 5.
Make out the difference between the incomplete and complete digestive systems.
The digestive system of Platyhelminthes has only a single opening to the exterior which serves as both mouth and anus and hence called an incomplete digestive system. From Aschelminthes to Chordates, all animals have a complete digestive system with two openings, the mouth, and the anus.

Question 6.
Name the embryonic layers of animals and on the basis of the origin and development.
During embryonic development, the tissues and organs of animals originate from two or three embryonic germ layers. On the basis of origin and development, animals are classified into two categories: Diploblastic and Triploblastic.

Question 7.
What are diploblastic animals?
Animals in which the cells are arranged in two embryonic layers the external ectoderm and internal endoderm are called diploblastic animals. In these animals, the ectoderm gives rise to the epidermis (the outer layer of the body wall) and the endoderm gives rise to the gastrodermis (tissue lining the gut cavity). An undifferentiated layer present between the ectoderm and endoderm is the mesoglea (Corals, Jellyfish, Sea anemone).

Question 8.
Define triploblastic animals for example.
Animals in which the developing embryo has three germinal layers are called triploblastic, animals and consists of outer ectoderm (skin, hair, neuron, nail, teeth, etc), inner endoderm (gut, lung, liver), and middle mesoderm (muscle, bone, heart). Most of the triploblastic animals show organ system level of organization (Flatworms to Chordates).

TN Board 11th Bio Zoology Important Questions Chapter 2 Kingdom Animalia

Question 9.
What is meant by symmetry?
Symmetry is the body arrangement in which parts that lie on the opposite side of an axis are identical. An animal’s body plan results from the animal’s pattern of development.

Question 10.
Define asymmetry for example.
The simplest body plan is seen in sponges. They do not display symmetry and are asymmetrical. Such animals lack a definite body plan or are irregular shaped and any plane passing through the center of the body does not divide them into two equal halves (Sponges).

Question 11.
Write about the radial symmetry with a suitable diagram.
Symmetrical animals have paired body parts that are arranged on either side of a plane passing through the central axis. When any plane passing through the central axis of the body divides an organism into two identical parts, it is called radial symmetry. Such radially symmetrical animals have a top and bottom side but no dorsal (back) and ventral (abdomen) side, no right and left side. They have a body plan in which the body parts are organized in a circle around an axis. It is the principal symmetry in diploblastic animals. Cnidarians such as sea anemone and corals are radially symmetrical. However, triploblastic animals like echinoderms eg. Starfish have five planes of symmetry and show Pentamerous radial symmetry:

Question 12.
What is bilateral and biradial symmetry? Give examples.
Animals that possess two pairs of symmetrical sides are said to be biradially symmetrical. Biradial symmetry is a combination of radial and bilateral symmetry as seen in ctenophores. There are only two planes of symmetry, one through the longitudinal and sagittal axis and the other through the longitudinal and transverse axis. eg. Comb jellyfish – Pleurobrachia.
Animals that have two similar halves on either side of the central plane show bilateral symmetry. It is an advantageous type of symmetry in triploblastic animals, which helps in seeking food, locating mates and escaping from predators more efficiently. Animals that . have dorsal and ventral sides, anterior and posterior ends, right and left sides are bilaterally symmetrical.

TN Board 11th Bio Zoology Important Questions Chapter 2 Kingdom Animalia

Question 13.
Which animals are called acoelomates? Give example.
Animals that do not possess a body cavity are called acoelomates. Since there is nobody cavity in these animals their body is solid without a perivisceral cavity, this restricts the free movement of internal organs (eg, Flatworms).

Question 14.
What is called coelomates?
Eucoelom or true coelom is a fluid-filled cavity that develops within the mesoderm and is lined by mesodermal epithelium called the peritoneum. Such animals with a true body cavity are called coelomates or coelomates.

Question 15.
What is notochord? How the animals are classified based on. this presence or absence of notochord?
The notochord is a mesodermally derived rod-like structure formed on the dorsal side during embryonic development in some animals. Based on the presence or absence of notochord, animals are classified as chordates (Cephalochordates, Urochordates, Pisces to Mammalia) and non chordates (Porifera to Hemichordata).

Question 16.
How the kingdom Animalia is classified broadly into sub-kingdoms?
The animal kingdom is divided into two sub-kingdoms, the Parazoa and Eumetazoa based on their organization.

  1. Parazoa: These include the multicellular sponges and their cells are loosely aggregated and do not form tissues or organs.
  2. Eumetazoa: These include multicellular animals with well-defined tissues, which are organized as organs and organ systems. Eumetazoans include two taxonomic levels called grades. They include Radiata and Bilateria.

TN Board 11th Bio Zoology Important Questions Chapter 2 Kingdom Animalia

Question 17.
Write about the ‘Division level’ Classification of Bilateria.
The eumetazoans other than Radiata, show organ level of organization and are bilaterally symmetrical and triploblastic. The grade Bilateria includes two taxonomic levels called Division.
Division: 1. Protostomia (Proto: first; stomium: mouth): Protostomia includes the eumetazoans in which the embryonic blastopore develops into the mouth. This division includes three subdivisions namely acoelomata, pseudocoelomata and schizocoelomata.
Division: 2. Deuterostomia (deuteron: secondary; stomium: mouth):, Eumetazoans in which anus is formed from or near the blastopore and the mouth is formed away from the blastopore.
It includes only one subdivision Enterocoelomata. They have a true coelom called enterocoel, formed from the archenteron.

Question 18.
Write about the special features of the phylum Porifera.

  1. These pore-bearing animals are commonly called sponges. They are aquatic, mostly marine, asymmetrical and a few species live in freshwaters.
  2. They are primitive, multicellular, sessile animals with a cellular level of organization in which the cells are loosely arranged. They are either radially symmetrical or asymmetrical animals.
  3. They possess a water transport system or canal system where water enters through minute pores called Ostia lining the body wall through which the water enters into a central cavity (spongocoel) and goes out through the osculum.
  4. This water transport system is helpful in food gathering, circulation, respiration, and removal of waste.
  5. Choanocytes or collar cells are special flagellated cells lining the spongocoel and the canals.
  6. Nutrition is holozoic and intracellular.
  7. All sponges are hermaphrodites.
  8. They also reproduce asexually by fragmentation or gemmule formation and sexually by the formation of gametes.
  9. Development is indirect with different types of larval stages such as parenchyma and amphiblastula.
  10. eg. Sycon (Scypha), Spongilla (freshwater sponge).

Question 19.
Write about the canal system found in Porifera.
They possess a water transport system or canal system where water enters through minute pores called Ostia lining the body wall through which the water enters into a central cavity (spongocoel) and goes out through the osculum.
This water transport system is helpful in food gathering, circulation, respiration, and removal of waste.

TN Board 11th Bio Zoology Important Questions Chapter 2 Kingdom Animalia

Question 20.
What is the function of cnidoblasts in phylum Cnidaria?
The name Cnidaria is derived from cnidocytes or cnidoblasts with stinging cells or nematocyst on tentacles. Cnidoblasts are used for anchorage, defense, and capturing prey.

Question 21.
Differentiate polyp and medusa of coelenterates or cnidarians.
Cnidarians exhibit two basic body forms, polyp, and medusa. The polyp forms are sessile and cylindrical (eg. Hydra, Adamsia), whereas the medusa is umbrella-shaped and free swimming.
The polyp represents the asexual generation and medusa represents the sexual generation. Polyps produce medusa asexually and medusa forms polyps sexually.

Question 22.
Write short notes about Ctenophora.

  1. Ctenophora are exclusively marine, radially symmetrical, diploblastic animals with tissue level of organization.
  2. Though they are diploblastic, their mesoglea is different from that of cnidaria. It contains amoebocytes and smooth muscle cells.
  3. They have eight external rows of ciliated comb plates (comb jellies) which help in locomotion, hence commonly called comb jellies or sea walnuts.
  4. Bioluminescence (the ability of a living organism to emit light) is well marked in ctenophores.
  5. They possess special cells called lasso cells or colloblasts which help in food capture.
  6. Digestion is both extracellular and intracellular.
  7. Sexes are not separate (monoecious). They reproduce only by sexual means.
  8. (Fertilization is external and development is indirect and includes a larval stage called cydippid larva, eg. Pleurobrachia and Ctenoplana.

Question 23.
What is the type of digestive system found among flatworms?
Some of the parasitic flatworms absorb nutrients directly from the host through their body surface. However, flatworms like liver fluke have an incomplete digestive system which means it has an only a single opening to the exterior which serves as both mouth and anus.

TN Board 11th Bio Zoology Important Questions Chapter 2 Kingdom Animalia

Question 24.
List out the characters of the phylum Annelida.

  1. Annelids are the first segmented animals to evolve.
  2. They are aquatic or terrestrial, free-living but some are parasitic.
  3. They are triploblastic, bilaterally symmetrical, schizocoelomates, and exhibit organ system level of body organization.
  4. The coelom with coelomic fluid creates a hydrostatic skeleton and aids in locomotion.
  5. Their elongated body is metamerically segmented and the body surface is divided into segments or metameres.
  6. Internally the segments are divided from one another by partitions called septa. This phenomenon is known as metamerism.
  7. Aquatic annelids like Nereis have lateral appendages called parapodia, which help in swimming.
  8. The circulatory system is of closed type and the respiratory pigments are hemoglobin and chlorocruorin.
  9. The nervous system consists of paired ganglion connected by the lateral nerves to the double ventral nerve cord.
  10. They reproduce sexually. Development is direct or indirect and includes a trochophore larva, eg. Lampito mauritii (Earthworm).

Question 25.
Write an account on the common characters of Arthropoda.

  1. This is the largest phylum of the Kingdom Animalia and includes the largest class called Insecta.
  2. They are bilaterally symmetrical, segmented, triploblastic and schizocoelomate animals with organ system grade of body organization.
  3. They have jointed appendages that are used for locomotion feeding and are sensory in function,
  4. The body is covered by cjiitinous exoskeleton for protection and to prevent water loss, It is shed off periodically by a process called molting or ecdysis.
  5. The body consists of a head, thorax, and abdomen with a body cavity called haemocoel.
  6. Respiratory organs are gills, book gills, book lungs or trachea.
  7. The circulatory system is of open type.
  8. Sensory organs like antennae, eyes (compound and simple), statocysts (organs of balance/ equilibrium) are present.
  9. Excretion takes place through malpighian tubules, green glands, coxal glands, etc.
  10. They are mostly dioecious and oviparous; fertilization is usually internal.
  11. Life history includes many larval stages followed by metamorphosis. eg. Limulus.

Question 26.
Define metamerism in Annelids.
The body of the annelids are metamerically segmented and the body surface is divided into segment or metameres. Internally the segments are divided from one another by partitions called septa. This phenomenon is known as metamerism.

TN Board 11th Bio Zoology Important Questions Chapter 2 Kingdom Animalia

Question 27.
Define moulting or ecdysis.
Body is covered by chitinous exoskeleton for protection and to prevent water loss, It is shed off periodically by a process called moulting or ecdysis.

Question 28.
Write few examples for the phylum, Arthopoda.

  1. Limulus (King crab, a living fossil)
  2. Palamnaeus (Scorpion)
  3. Eupagarus (Hermit crab)
  4. Apis (Honey bee)
  5. Musca (House fly)
  6. Vectors – Anopheles, Culex, Aedes (mosquitoes)
  7. Economically important insects – Apis- (Honey bee), Bombyx (Silk worm)
  8. Laccifer (Lac insects)
  9. Living fossils Limulus-(King crab)
  10. Gregarious pest – Locusta (Locust)

Question 29.
Write the salient features of the phylum mollusca.

  1. This is the second-largest animal phylum.
  2. Molluscs are terrestrial or aquatic (marine or fresh water) and exhibit organ system level of body organisation.
  3. They are bilaterally symmetrical (except univalves), triploblastic and coelomate animals.
  4. Body is covered by a calcareous shell and is unsegmented with a distinct head, muscular foot and a visceral hump or visceral mass.
  5. A soft layer of skin forms a mantle over the visceral hump. The space between the visceral mass and mantle (pallium) is called the mantle cavity.
  6. A number of feather like gills (ctenidia) are present, which are respiratory in function.
  7. The digestive system is complete and mouth contains a rasping organ called radula with transverse rows of chitinous teeth for feeding (radula is absent in bivalves.
  8. The sense organs are tentacles, eyes and ospharidium (to test the purity of water and present in bivalves and gastropods).
  9. Excretory organs are nephridia.
  10. Open type of circulatory system is seen except for cephalopods such as squids, cuttle fishes and octopuses. Blood contains haemocyanin, a copper containing respiratory pigment.
  11. Development is indirect with a veliger larva.
  12. eg. Pila (Apple snail).

Question 30.
Write the functions of the following: (i) Ctenidia, (ii) Ospharidiam.

  1. Ctenidia: Mandle cavity has a number of feather like gills (ctenidia) are present, which are respiratory in function.
  2. Ospharidiam: The anterior head regim of molluscs has ospharidium to test the purity of water and presence in bivalves and gasropods.

Question 31.
Why ore certain marine animals termed as echinoderms?
All Echinoderms are marine animals. These animals have a mesodermal endoskeleton of calcareous ossicles and hence the name Echinodermata.

TN Board 11th Bio Zoology Important Questions Chapter 2 Kingdom Animalia

Question 32.
What is the most distinctive feature of echinoderms and write its importance in them?
The most distinctive feature of echinoderms is the presence of the water vascular system or ambulacral system with tube feet or podia, which helps in locomotion, capture and transport of food and respiration.

Question 33.
What are the fundamental distinct features of all chordates?
All chordates possess three fundamental distinct features at some stage of their life cycle, they are:

  1. Presence of elongated rod like notochord below the nerve cord and above the alimentary canal. It serves as a primitive internal skeleton. It may persist throughout life in lancelets and lampreys. In adult vertebrates, it may be partially or completely replaced by backbone or vertebral column.
  2. A dorsal hollow or tubular fluid filled nerve cord lies above the notochord and below the dorsal body wall. It serve’s to integrate and co-ordinate the body functions. In higher chordates, the anterior end of the nerve cord gets enlarged to form the brain and the posterior part becomes the spinal cord, protected inside the vertebral column.
  3. Presence of pharyngeal gill slits or clefts in all chordates at some stage of their life cycle.
    It is a series of gill slits or clefts that perforates the walls of pharynx and appears during the development of every chordate. In aquatic forms, pharyngeal gill slits are vascular, lamellar and form the gills for respiration. In terrestrial chordates, traces of non-functional gill clefts appear during embryonic developmental stages and disappear later. Besides the above said features, chordates are bilaterally symmetrical, triploblastic, coelomates with organ system level of organisation; they possess post anal tail, closed circulatory system with a ventral myogenic heart except in Amphioxus.

Question 34.
Give a brief account on the characters of Tunicates.
They are exclusively marine and are commonly called sea squirts. Mostly sessile, some pelagic or free swimming, exist as solitary and colonial forms. Body is unsegmented and covered by a test or tunic. Adult forms%re sac like. Coelom is absent, but has an atrial cavity surrounding the pharynx. Notochord is present only in the tail region of the larval stage, hence named urochordata. Alimentary canal is complete and circulatory system is of open type. The heart is ventral and tubular.
TN Board 11th Bio Zoology Important Questions Chapter 2 Kingdom Animalia 1
Respiration is through gill slits and clefts. Dorsal tubular nerv e cord is present only in the larval stage and a single dorsal ganglion is present in the adults. Mostly hennaphrodites, development indirect and includes a free swimming tadpole larva with chordate characters. Retrogressive metamorphosis is seen. eg. Ascidia.

Question 35.
Give an account of the General features of subphylum caphalochorelata.
Cephalochordates are marine forms, found in shallow waters, leading a burrowing mode of life. They are small fish like coelomate forms with chordate characters such us notochord, dorsal tubular nerve cord and pharyngeal gill slits throughout their life. Closed type of circulatory system is seen without heart. Excretion is by protonephridia. Sexes are separate, Fertilization is external, eg. Branchiostoma.

TN Board 11th Bio Zoology Important Questions Chapter 2 Kingdom Animalia

Question 36.
How are the vertebrates are further divided by divisions? Write the differences between them.

  1. Subphylum Vertebrata is divided into two divisions, Agnatha and Gnathostomata.
  2. Agnatha includes jawless fish-like aquatic vertebrates without paired appendages. Notochord persists in the adult.
  3. Agnatha includes one important class – Cyclostomata.
  4. Gnathostomata includes jawed vertebrates with paired appendages. Notochord is replaced partly or wholly by the vertebral column.
  5. Gnathostomata includes jawed fishes (Pisces) and Tetrapoda ( amphibia, reptilia, aves and mammals).The superclass Pisces includes all fishes which are essentially aquatic forms with paired fins for swimming and gills for respiration. Pisces includes cartilaginous fishes (Chondrichthyes) and bony fishes (Osteicthyes).

Question 37.
What is the special character seen in cyclostomes during spawning?
Cyclostomes are marine but migrate to fresh waters for spawning (anadromous migration). After spawning within a few days they die. The larvae (ammocoete) after metamorphosis returns to the ocean.

Question 38.
Give some examples for bony fishes coming under Osteichthyes.
Exocoetus, Labeo, Catla, Echeneis, Pterophyllam.

Question 39.
Write the general characters of amphibians with some examples.

  1. Amphibians are the first vertebrates and tetrapods to live both in aquatic as well as terrestrial habitats.
  2. They are poikilothermic.
  3. Their body is divisible into the head and trunk and most of them have two pairs of limbs; tail may or may not be present.
  4. Their skin is smooth or rough, moist, pigmented and glandular.
  5. Eyes have eyelids and the tympanum represents the ear.
  6. Respiration is by gills, lungs and through the skin.
  7. The heart is three-chambered.
  8. Kidneys are mesonephric. Sexes are separate and fertilization is external.
  9. They are oviparous and development is indirect. They show hibernation and aestivation.
  10. eg. Bufo (Toad), Rana (Frog).

TN Board 11th Bio Zoology Important Questions Chapter 2 Kingdom Animalia

Question 40.
What are the general features of Reptilians?

  1. They are mostly terrestrial animals and their body is covered by dry, and comified skin with epidermal scales or scutes.
  2. Reptiles have three chambered heart but four chambered in crocodiles.
  3. All are cold blooded amniotes.
  4. Most reptiles lay cleidoic eggs with extraembryonic membranes like amnion, allantois, chorion and yolk sac.
  5. Excretion by metanephric kidneys and are uricotelic.
  6. They are monoecious. Internal fertilization takes place and all are oviparous.
  7. eg. Calotes (Garden Lizard), Draco (Flying Lizard), Crocodilus (Crocodile).

Question 41.
Describe the special characteristic features of Aves.

  1. Aves are commonly known as birds. The characteristic feature of Aves is the presence of feathers and the ability to fly except for flightless birds, eg. Ostrich, Kiwi.
  2. The forelimbs are modified into wings, and the hind limbs are adapted for walking, running, swimming and perching.
  3. The skin is dry and devoid of glands except the oil gland or preen gland at the base of the tail.
  4. The exoskeleton consists of epidermal feathers, scales, claws on legs and the homy, covering on the beak.
  5. The endoskeleton is fully ossified (bony) and the long bones are hollow with air cavities (pneumatic bones).
  6. The pectoral muscles of flight (pectoralis major and pectoralis minor) are well developed.
  7. Respiration is by compact, elastic, spongy lungs that are continuous with air sacs to supplement respiration.
  8. The heart is four chambered.
  9. The urinary bladder is absent.
  10. Sexes are separate with well marked sexual dimorphism.
  11. All birds are oviparous. Eggs are megalecithal and cleidoic. Fertilization is internal.
  12. eg. Corvus (Crow), Columba (Pigeon), Pavo (Peacock).

Question 42.
Write the general characters of the class mammalia.

  1. Their body is covered by hair, a unique feature of mammals. Some of them are adapted to fly or live in water.
  2. The presence of mammary glands is the most unique feature of mammals.
  3. They have two pairs of limbs adapted for walking, running, climbing, burrowing, swimming and flying.
  4. Their skin is glandular in nature, consisting of sweat glands, scent glands and sebaceous glands.
  5. Exoskeleton includes homy epidermal horns, spines, scales, claws, nails, hooves and bony dermal plates.
  6. Teeth are thecodont, heterodont and diphyodont.
  7. External ears or pinnae are present.
  8. The heart is four-chambered and possesses a left systematic arch. Mature RBCs are circular, biconcave and non nucleated.
  9. Mammals have a large brain when compared to other animals.
  10. They show greatest intelligence among all animals. Their kidneys are metanephric and are ureotelic.
  11. All are homeothermic, sexes are separate and fertilization is internal.
  12. eg. Platypus, Kangaroo, Monkey, Elephant.

TN Board 11th Bio Zoology Important Questions Chapter 2 Kingdom Animalia

Question 43.
Name two different types of larval stages in Porifera.
Two different types of larval stages of porifera are parenchymula and amphiblastula.

Choose the correct answer.

1. Biradial symmetry is seen in:
(h) Star fish
(b) Comb jelly fish
(c) Sea anemone
(d) Sponge
(b) Comb jelly fish

2. The special flagellated cells lining the spongocoel is:
(a) Choanocytes
(b) Cridocytes
(c) Nematocyst
(d) Lasso cells
(a) Choanocytes

3. The minute pores lining the body wall of Porifera are called:
(a) Osculum
(b) Podia
(c) Ostia
(d) Gills
(c) Ostia

4. The central body cavity of poriferans are:
(a) Gastrocoel
(b) Coelom
(c) Haemocoel
(d) Spongocoel
(d) Spongocoel

TN Board 11th Bio Zoology Important Questions Chapter 2 Kingdom Animalia

5. The free-swimming ciliated larval form of criclaria is:
(a) Planula larva
(b) Parenchymula larva
(c) Amphiblastula larva
(d) Veliger larva
(a) Planula larva

6. In case of flatworms the specialized excretory cells are named as:
(a) Nematocysts
(b) Flame cells
(c) Nephridia
(d) Malphigian tubules
(b) Flame cells

7. Nereis have lateral appendages called:
(a) Parapodia
(b) Body setae
(c) Foot
(d) Tube feet
(a) Parapodia

8. The special cells of ctenophora helps in food capture is:
(a) Cnidoblasts
(b) Choanocytes
(c) Flamecells
(d) Colloblasts
(d) Colloblasts

9. ………… are the organs of balance in Arthropods.
(a) Nematocysts
(b) Statocysts
(c) Choanocytes
(d) Cochlea
(b) Statocysts

10. ……….. is the largest phylum of the kingdom Animalia.
(a) Annelida
(b) Arthropoda
(c) Aschelminthes
(d) Echinodermata
(b) Arthropoda

TN Board 11th Bio Zoology Important Questions Chapter 2 Kingdom Animalia

11. The second largest animal phylum is:
(a) Ctenophora
(b) Arthropoda
(c) Mollusca
(d) Coelenterata
(c) Mollusca

12. The anterior head region of molluscs has got this organ which helps to test the purity of water:
(a) Ostia
(b) Ospharidiam
(c) Ossicles
(d) Gills
(b) Ospharidiam

13. The larva of Nereis is:
(a) Planula
(b) Tomaria larva
(c) Trocophore larva
(d) Miracidium
(c) Trocophore larva

14. Presence of water vascular system is the most distinctive feature of the Phylum:
(a) Mollusca
(b) Sponges
(c) Echinodermata
(d) Arthropoda
(c) Echinodermata

15. The mantle cavity of the molluscs has got number of feather like gills, which are respiratory and excretory in function are:
(a) Book lungs
(b) Trachea
(c) Ambulacral system
(d) Ctenidia
(d) Ctenidia

TN Board 11th Bio Zoology Important Questions Chapter 2 Kingdom Animalia

16. The phylum Hemichordata are mostly tubiculous and commonly called:
(a) Flat worms
(b) Round worms
(c) Tongue worms
(d) Parasitic worms
(c) Tongue worms

17. The free swimming larva of Hemichordata are called:
(a) Tomaria larvae
(b) Planula larvae
(c) Trochophore larvae
(d) Cercaria larvae
(a) Tomaria larvae

18. The tunicates are normally called:
(a) Sea squirts
(b) Sea anemone
(c) Sea-walnuts
(d) Sea urchin
(a) Sea squirts

19. The chondrichthyes has got this type of gills helps for respiration:
(a) Filamentous gills
(b) Lamelliform gills
(c) Filiform gills
(d) Ambnlacral system
(b) Lamelliform gills

20. The excretory organ of Chondrichthyes are:
(a) Pronephric kidneys
(b) Opisthonephric kidneys
(c) Mesonephric kidneys
(d) Metanephric kidneys
(b) Opisthonephric kidneys.

TN Board 11th Bio Zoology Important Questions Chapter 2 Kingdom Animalia

21. The excretory organ of Osteichthyes are:
(a) Mesonephnc kidneys
(b) Opisthonephric kidneys
(c) Holonephric kidneys
(d) Metanephric kidneys
(a) Mesonephnc kidneys

22. The eggs of Aves are of type.
(a) Microlecithal
(b) Mesolecithal
(c) Megalecithal
(d) Homolecithal
(c) Megalecithal

23. The mature RBCs are non – nucleated in:
(a) Molluscs
(b) Mammals
(c) Fishes
(d) Birds
(b) Mammals

24. Match:

(i) Scoliodon (a) Electric rav
(it) Trygon (b) Sting ray
(iii) Torpedo (c) Lamprey
(iv) Pristis (d) Dogfish
(v) Petromyzon (e) Sawfish

(a) (i)-(d), (ii)-(b), (iii)-(a), (iv)-(e), (v)-(c)
(b) (i)-(c), (ii)-(d), (iii)-(b), (iv)-(a), (v)-(c)
(c) (i)-(a), (ii)-(c), (iii)-(e), (iv)-(b), (v)-(d)
(d) (i)-(c), (ii)-(e), (iii)-(d), (iv)-(b), (v)-(a)
(a) (i)-(d), (ii)-(b), (iii)-(a), (iv)-(e), (v)-(c)

TN Board 11th Bio Zoology Important Questions Chapter 2 Kingdom Animalia

25. Match:

(i) Sycon (a) Bath sponges
(ii) Euspongia (b) Glassrope sponge
(iii) Euplectella (c) Scypha
(iv) Hyalonema (d) deadman’s finger
(v) Chalina (e) Venus flower baskets

(a) (i)-(b), (ii)-(c), (iii)-(d), (iv)-(e), (v)-(a)
(b) (i)-(c), (ii)-(a), (iii)-(e), (iv)-(b), (v)-(d)
(c) (i)-(a), (ii)-(c), (iii)-(b), (iv)-(d), (v)-(e)
(d) (i)-(e), (ii)-(d), (iii)-(c), (iv)-(b), (v)-(a)
(b) (i)-(c), (ii)-(a), (iii)-(e), (iv)-(b), (v)-(d)