Animal Kingdom Easy MCQs [25 Qs]

Question: From NCERT | NEET || [Difficult level:Easy] |||

.Identify the incorrectly matched pair

1.	Ornithorhynchus:	Oviparous mammal
2.	Macropus:	Marsupial mammal
3.	Balaenoptera:	Largest land mammal
4.	Pteropus:	Flying mammal

.

.Subtopic: Study of Aves & Mammals

✅

Answer ▽ ✅Verified

Balaenoptera:

Largest land mammal❌

Largest water mammal✅

Class – Mammalia

👉They are found in a variety of habitats – polar ice caps, deserts, mountains,

forests, grasslands and dark caves.

👉Some of them have adapted to fly or

live in water.

👉The most unique mammalian characteristic is the presence

of milk producing glands (mammary glands) by which the young ones

are nourished.

👉They have two pairs of limbs, adapted for walking, running,

climbing, burrowing, swimming or flying

👉The skin of mammals is unique in possessing hair.

👉External ears or pinnae are

present. Different types of teeth are present in the jaw. Heart is fourchambered.

They are homoiothermous. Respiration is by lungs. Sexes

are separate and fertilisation is internal. They are viviparous with few

exceptions and development is direct.

👉Examples:

👉Oviparous-Ornithorhynchus (Platypus)

Viviparous

👉Macropus (Kangaroo),

👉Pteropus (Flying fox)

👉Camelus (Camel)

👉Macaca(Monkey)

👉Rattus (Rat

👉Canis (Dog)

👉Felis (Cat),

👉Elephas (Elephant),

👉Equus (Horse

👉Delphinus (Common dolphin

👉Balaenoptera (Blue whale),

👉Panthera tigris (Tiger),

👉Panthera leo (Lion).

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Question: From NCERT | NEET || [Difficult level:Easy] |||

.Match each item in Column I with one item in Column II and chose your answer from the codes given below:

Column I

Feature

Column II

Phylum

(a) Lateral line system

(b) Water vascular system

(d) Comb plates

(e) Parapodia

(i) Ctenophora

(ii) Mollusca

(iii) Echinodermata

(iv) Osteichthyes

(v) Annelida

Codes

(a) (b) (c) (d) (e)

1. (i) (ii) (iii) (iv) (v)

2. (iv) (iii) (ii) (i) (v)

3. (v) (iii) (i) (iv) (ii)

4. (iii) (ii) (i) (v) (iv)

.

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Answer ▽ ✅Verified

(a) (b) (c) (d) (e)

2. (iv) (iii) (ii) (i) (v)

Phylum – Annelida

👉They may be aquatic (marine and fresh water) or

terrestrial; free-living, and sometimes parasitic.

👉They exhibit organ-system level of body

organisation and bilateral symmetry.

👉They are

triploblastic, metamerically segmented and

coelomate animals.

👉Their body surface is

distinctly marked out into segments or

metameres and, hence, the phylum name

Annelida (Latin, annulus : little ring)

👉They possess longitudinal and circular muscles

which help in locomotion.

👉Aquatic annelids like

Nereis possess lateral appendages, parapodia,

which help in swimming.

👉A closed circulatory

system is present.

👉Nephridia (sing. nephridium)

help in osmoregulation and excretion.

👉Neural

system consists of paired ganglia (sing. ganglion)

connected by lateral nerves to a double ventral

nerve cord.

👉Nereis, an aquatic form, is dioecious,

but earthworms and leeches are monoecious.

Reproduction is sexual.

👉Examples : Nereis, Pheretima (Earthworm) and

Hirudinaria (Blood sucking leech).

👉

Osteichthyes

👉

👉It includes both marine and fresh water fishes with bony

endoskeleton.

👉Their body is streamlined. Mouth is

mostly terminal

👉They have four pairs of

gills which are covered by an operculum on each side.

👉Skin is covered with cycloid/ctenoid scales

👉Air bladder

is present which regulates buoyancy.

👉Heart is twochambered

(one auricle and one ventricle). They are

cold-blooded animals.

👉Sexes are separate. Fertilisation

is usually external. They are mostly oviparous and

development is direct.

👉Examples: Marine – Exocoetus (Flying fish),

Hippocampus (Sea horse); Freshwater – Labeo (Rohu),

Catla (Katla), Clarias (Magur); Aquarium – Betta

(Fighting fish), Pterophyllum (Angel fish).

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Question: From NCERT | NEET || [Difficult level:Easy] |||

.Identify the option where all the columns are not correctly matched:

	Animal	Phylum	Features
1.	Pleurobrachia	Ctenophora	Comb plates, Only sexual reproduction
2.	Loligo	Mollusca	Radula, Dioecious
3.	Balanoglossus	Hemichordata	Respiration by gills, Proboscis gland
4.	Ascidia	Chordata	Marine, Notochord persistent throughout life

.

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Answer ▽ ✅Verified

Ascidia

Chordata

Marine, Notochord
persistent throughout life

Phylum – Chordata

Animals belonging to phylum Chordata are fundamentally

characterised by the presence of a notochord, a dorsal hollow nerve cord and paired pharyngeal

gill slits.

These are bilaterally

symmetrical, triploblastic, coelomate with

organ-system level of organisation. They

possess a post anal tail and a closed circulatory

system.

Phylum Chordata is divided into three

subphyla: Urochordata or Tunicata,

Cephalochordata and Vertebrata.

Subphyla Urochordata and

Cephalochordata are often referred to as

protochordates and are

exclusively marine. In Urochordata, notochord

is present only in larval tail, while in

Cephalochordata, it extends from head to tail

region and is persistent throughout their life.

Examples: Urochordata – Ascidia, Salpa,

Doliolum; Cephalochordata – Branchiostoma

(Amphioxus or Lancelet).

The members of subphylum Vertebrata

possess notochord during the embryonic

period. The notochord is replaced by a

cartilaginous or bony vertebral column in the

adult. Thus all vertebrates are chordates but

all chordates are not vertebrates. Besides the

basic chordate characters, vertebrates have a

ventral muscular heart with two, three or four

chambers, kidneys for excretion and

osmoregulation and paired appendages which

may be fins or limbs.

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Question: From NCERT | NEET || [Difficult level:Easy] |||

.Operculum and an air bladder are present in :

1. Clarias

2. Pristis

3. Trygon

4. Carcohrodon

.

✅

Answer ▽ ✅Verified

1. Clarias

Class – Osteichthyes

It includes both marine and fresh water fishes with bony

endoskeleton. Their body is streamlined. Mouth is

mostly terminal . They have four pairs of

gills which are covered by an operculum on each side.

Skin is covered with cycloid/ctenoid scales. Air bladder

is present which regulates buoyancy. Heart is two chambered

(one auricle and one ventricle). They are

cold-blooded animals. Sexes are separate. Fertilisation

is usually external. They are mostly oviparous and

development is direct.

Examples: Marine – Exocoetus (Flying fish),

Hippocampus (Sea horse); Freshwater – Labeo (Rohu),

Catla (Katla), Clarias (Magur); Aquarium – Betta

(Fighting fish), Pterophyllum (Angel fish).

Class – Chondrichthyes

They are marine animals with streamlined body

and have cartilaginous endoskeleton

. Mouth is located ventrally.

Notochord is persistent throughout life. Gill

slits are separate and without operculum (gill

cover). The skin is tough, containing minute

placoid scales. Teeth are modified placoid

scales which are backwardly directed. Their

jaws are very powerful. These animals are

predaceous. Due to the absence of air bladder,

they have to swim constantly to avoid sinking.

Heart is two-chambered (one auricle and one ventricle).

Some of them have electric organs (e.g., Torpedo) and

some possess poison sting (e.g., Trygon). They are

cold-blooded (poikilothermous) animals, i.e., they lack

the capacity to regulate their body temperature. Sexes

are separate. In males pelvic fins bear claspers. They

have internal fertilisation and many of them are

viviparous.

Examples: Scoliodon (Dog fish), Pristis (Saw fish),

Carcharodon (Great white shark), Trygon (Sting ray).

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Question: From NCERT | NEET 2016 || [Difficult level:Easy] |||

.Choose the correct statements.

(1) All mammals are viviparous

(2) All cyclostomes do not possess jaws and paired fins

(3) All reptiles have a three-chambered heart

(4) All Pisces have gills covered by an operculum

.

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Answer ▽ ✅Verified

(2) All cyclostomes do not possess jaws and paired fins

Class – Cyclostomata

All living members of the class Cyclostomata are

ectoparasites on some fishes. They have an

elongated body bearing 6-15 pairs of gill slits

for respiration. Cyclostomes have a sucking and

circular mouth without jaws (Fig. 4.18). Their

body is devoid of scales and paired fins.

Cranium and vertebral column are

cartilaginous. Circulation is of closed type.

Cyclostomes are marine but migrate for

spawning to fresh water. After spawning, within

a few days, they die. Their larvae, after

metamorphosis, return to the ocean.

Examples: Petromyzon (Lamprey) and Myxine

(Hagfish)

Class – Mammalia

👉They are found in a variety of habitats – polar ice caps, deserts, mountains,

forests, grasslands and dark caves.

👉Some of them have adapted to fly or

live in water.

👉The most unique mammalian characteristic is the presence

of milk producing glands (mammary glands) by which the young ones

are nourished.

👉They have two pairs of limbs, adapted for walking, running,

climbing, burrowing, swimming or flying

👉The skin of mammals is unique in possessing hair.

👉External ears or pinnae are

present. Different types of teeth are present in the jaw. Heart is fourchambered.

They are homoiothermous. Respiration is by lungs. Sexes

are separate and fertilisation is internal. They are viviparous with few

exceptions and development is direct.

👉Examples:

👉Oviparous-Ornithorhynchus (Platypus)

Viviparous

👉Macropus (Kangaroo),

👉Pteropus (Flying fox)

👉Camelus (Camel)

👉Macaca(Monkey)

👉Rattus (Rat

👉Canis (Dog)

👉Felis (Cat),

👉Elephas (Elephant),

👉Equus (Horse

👉Delphinus (Common dolphin

👉Balaenoptera (Blue whale),

👉Panthera tigris (Tiger),

👉Panthera leo (Lion).

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Question: From NCERT | NEET 2016 || [Difficult level:Easy] |||

.Which of the following characteristic features always holds true for the corresponding group of animals?

(1)	Viviparous	Mammalia
(2)	Possess a mouth with an upper and a lower jaw	Chordata
(3)	3-chambered heart with one incompletely divided ventricle	Reptilia
(4)	Cartilaginous – endoskeleton	Chondrichthyes

.

✅

Answer ▽ ✅Verified

4.Cartilaginous – endoskeleton

Chondrichthyes

Class – Chondrichthyes

They are marine animals with streamlined body

and have cartilaginous endoskeleton

. Mouth is located ventrally.

Notochord is persistent throughout life. Gill

slits are separate and without operculum (gill

cover). The skin is tough, containing minute

placoid scales. Teeth are modified placoid

scales which are backwardly directed. Their

jaws are very powerful. These animals are

predaceous. Due to the absence of air bladder,

they have to swim constantly to avoid sinking.

Heart is two-chambered (one auricle and one ventricle).

Some of them have electric organs (e.g., Torpedo) and

some possess poison sting (e.g., Trygon). They are

cold-blooded (poikilothermous) animals, i.e., they lack

the capacity to regulate their body temperature. Sexes

are separate. In males pelvic fins bear claspers. They

have internal fertilisation and many of them are

viviparous.

Examples: Scoliodon (Dog fish), Pristis (Saw fish),

Carcharodon (Great white shark), Trygon (Sting ray).

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Question: From NCERT | NEET || [Difficult level:Easy] |||

.Which of the following features is not present in the phylum – Arthropoda?

(1) Metameric segmentation

(2) Parapodia

(3) Jointed appendages

(4) Chitinous exoskeleton

.

✅

Answer ▽ ✅Verified

(2) Parapodia

Phylum – Arthropoda
This is the largest phylum of Animalia which
includes insects. Over two-thirds of all named
species on earth are arthropods .
They have organ-system level of organisation.
They are bilaterally symmetrical, triploblastic,
segmented and coelomate animals. The body
of arthropods is covered by chitinous
exoskeleton. The body consists of head, thorax
and abdomen. They have jointed appendages
(arthros-joint, poda-appendages). Respiratory
organs are gills, book gills, book lungs or
tracheal system. Circulatory system is of open
type. Sensory organs like antennae, eyes
(compound and simple), statocysts or
balancing organs are present. Excretion takes
place through malpighian tubules. They are
mostly dioecious. Fertilisation is usually
internal. They are mostly oviparous.
Development may be direct or indirect.
Examples: Economically important insects –
Apis (Honey bee), Bombyx (Silkworm), Laccifer
(Lac insect)
Vectors – Anopheles, Culex and Aedes
(Mosquitoes)
Gregarious pest – Locusta (Locust)
Living fossil – Limulus (King crab).

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Question: From NCERT | NEET 2014 || [Difficult level:Easy] |||

.A marine cartilaginous fish that can produce electric current is

(1) Pristis

(2) Torpedo

(3) Trygon

(4) Scoliodon

.

✅

Answer ▽ ✅Verified

(2) Torpedo

Class – Chondrichthyes

They are marine animals with streamlined body

and have cartilaginous endoskeleton

. Mouth is located ventrally.

Notochord is persistent throughout life. Gill

slits are separate and without operculum (gill

cover). The skin is tough, containing minute

placoid scales. Teeth are modified placoid

scales which are backwardly directed. Their

jaws are very powerful. These animals are

predaceous. Due to the absence of air bladder,

they have to swim constantly to avoid sinking.

Heart is two-chambered (one auricle and one ventricle).

Some of them have electric organs (e.g., Torpedo) and

some possess poison sting (e.g., Trygon). They are

cold-blooded (poikilothermous) animals, i.e., they lack

the capacity to regulate their body temperature. Sexes

are separate. In males pelvic fins bear claspers. They

have internal fertilisation and many of them are

viviparous.

Examples: Scoliodon (Dog fish), Pristis (Saw fish),

Carcharodon (Great white shark), Trygon (Sting ray).

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Question: From NCERT | NEET 2010 || [Difficult level:Easy] |||

.Which one of the following kinds of animals are triploblastic?

(1) Flat worms

(2) Sponges

(3) Ctenophores

(4) Corals

.

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Answer ▽ ✅Verified

(1) Flat worms

Phylum – Platyhelminthes

They have dorso-ventrally flattened body, hence are called

flatworms . These are mostly endoparasites found

in animals including human beings. Flatworms are bilaterally

symmetrical, triploblastic and acoelomate animals with organ

level of organisation. Hooks and suckers are present in the

parasitic forms. Some of them absorb nutrients from the host

directly through their body surface. Specialised cells called

flame cells help in osmoregulation and excretion. Sexes are not

separate. Fertilisation is internal and development is through

many larval stages. Some members like Planaria possess high

regeneration capacity.

Examples: Taenia (Tapeworm), Fasciola (Liver fluke).

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Question: From NCERT | NEET 2010 || [Difficult level:Easy] |||

.Which one of the following statements about certain given animals is correct?

(1) Round worms (Aschelminthes) are pseudocoelomates

(2) Molluscs are acoelomates

(3) Insects are pseudocoelomates

(4) Flat worms (Platyhelminthes) are coelomates

.

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Answer ▽ ✅Verified

(1) Round worms (Aschelminthes) are pseudocoelomates

Phylum – Aschelminthes

The body of the aschelminthes is circular in

cross-section, hence, the name roundworms

. They may be freeliving, aquatic

and terrestrial or parasitic in plants and animals.

Roundworms have organ-system level of body

organisation. They are bilaterally symmetrical,

triploblastic and pseudocoelomate animals.

Alimentary canal is complete with a welldeveloped

muscular pharynx. An excretory

tube removes body wastes from the body cavity

through the excretory pore. Sexes are separate

(dioecious), i.e., males and females are distinct.

Often females are longer than males. Fertilisation

is internal and development may be direct (the

young ones resemble the adult) or indirect.

Examples : Ascaris (Roundworm), Wuchereria

(Filaria worm), Ancylostoma (Hookworm).

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Question: From NCERT | NEET 2009 || [Difficult level:Easy] |||

.Which one of the following pairs of animal comprises ‘jawless fishes’?

(1) Lampreys and eels

(2) Mackerels and rohu

(3) Lampreys and hag fishes

(4) Guppies and hag fishes

.

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Answer ▽ ✅Verified

(3) Lampreys and hag fishes

Class – Cyclostomata

All living members of the class Cyclostomata are

ectoparasites on some fishes. They have an

elongated body bearing 6-15 pairs of gill slits

for respiration. Cyclostomes have a sucking and

circular mouth without jaws . Their

body is devoid of scales and paired fins.

Cranium and vertebral column are

cartilaginous. Circulation is of closed type.

Cyclostomes are marine but migrate for

spawning to fresh water. After spawning, within

a few days, they die. Their larvae, after

metamorphosis, return to the ocean.

Examples: Petromyzon (Lamprey) and Myxine

(Hagfish)

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Question: From NCERT | NEET2015 || [Difficult level:Easy] |||

.Metagenesis refers to

1. the presence of different morphic forms

2. alternation of generation between asexual and sexual phases of an organism

3. occurance of a drastic change in form during post embryonic development

4. the presence of a segmented body and parthenogenetic mode of reproduction

.

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Answer ▽ ✅Verified

2. alternation of generation between asexual and sexual phases of an organism

Those cnidarians which exist in both forms exhibit alternation of

generation (Metagenesis), i.e., polyps produce medusae asexually and

medusae form the polyps sexually (e.g., Obelia).

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Question: From NCERT | NEET || [Difficult level:Easy] |||

.Chitin is a polysaccharide found in the exoskeleton of

(1) prawn

(2) insects

(3) crabs

(4) all of these

.

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Answer ▽ ✅Verified

👉Annelids are metamerically segmented animals with a true coelom. 👉The arthropods are the most abundant group of animals characterised by the presence

of jointed appendages. The body is covered with external skeleton made of chitin

👉The molluscs have a soft body surrounded by an external

calcareous shell. .

👉The echinoderms possess a spiny skin. Their most distinctive feature is the presence

of water vascular system.

👉The hemichordates are a small group of worm-like marine

animals. They have a cylindrical body with proboscis, collar and trunk.

👉Exoskeletons of arthropods, for example, have a complex

polysaccharide called chitin. These complex polysaccharides are mostly

homopolymers.

👉Decomposition is largely an oxygen-requiring process. The rate of

decomposition is controlled by chemical composition of detritus and

climatic factors. In a particular climatic condition, decomposition rate

is slower if detritus is rich in lignin and chitin, and quicker, if detritus is

rich in nitrogen and water-soluble substances like sugars.

👉With the exception of yeasts which are unicellular, fungi are

filamentous. Their bodies consist of long, slender thread-like structures

called hyphae. The network of hyphae is known as mycelium. Some hyphae

are continuous tubes filled with multinucleated cytoplasm – these are

called coenocytic hyphae. Others have septae or cross walls in their

hyphae. The cell walls of fungi are composed of chitin and polysaccharides.

👉Phylum – Arthropoda
This is the largest phylum of Animalia which
includes insects. Over two-thirds of all named
species on earth are arthropods .
They have organ-system level of organisation.
They are bilaterally symmetrical, triploblastic,
segmented and coelomate animals. The body
of arthropods is covered by chitinous
exoskeleton. The body consists of head, thorax
and abdomen. They have jointed appendages
(arthros-joint, poda-appendages). Respiratory
organs are gills, book gills, book lungs or
tracheal system. Circulatory system is of open
type. Sensory organs like antennae, eyes
(compound and simple), statocysts or
balancing organs are present. Excretion takes
place through malpighian tubules. They are
mostly dioecious. Fertilisation is usually
internal. They are mostly oviparous.
Development may be direct or indirect.
Examples: Economically important insects –
Apis (Honey bee), Bombyx (Silkworm), Laccifer
(Lac insect)
Vectors – Anopheles, Culex and Aedes
(Mosquitoes)
Gregarious pest – Locusta (Locust)
Living fossil – Limulus (King crab).

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Question: From NCERT | NEET || [Difficult level:Easy] |||

.Which of these is not a coelenterate?

(1) Sea pen

(2) Sea fur

(3) Sea anemone

(4) Sea lily

.

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Answer ▽ ✅Verified

(2) Sea fur

Coelenterata (Cnidaria)

Examples: Physalia (Portuguese man-of-war), Adamsia (Sea anemone),

Pennatula (Sea-pen), Gorgonia (Sea-fan) and Meandrina (Brain coral).

Ctenophora

sea walnuts or comb jellies

Mollusca

Examples: Pila (Apple snail), Pinctada (Pearl oyster), Sepia

(Cuttlefish), Loligo (Squid), Octopus (Devil fish), Aplysia (Seahare),

Dentalium (Tusk shell) and Chaetopleura (Chiton).

Echinodermata

Examples: Asterias (Star fish), Echinus (Sea urchin), Antedon

(Sea lily), Cucumaria (Sea cucumber) and Ophiura (Brittle star).

Osteichthyes

Examples: Marine – Exocoetus (Flying fish),

Hippocampus (Sea horse); Freshwater – Labeo (Rohu),

Catla (Katla), Clarias (Magur); Aquarium – Betta

(Fighting fish), Pterophyllum (Angel fish).

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Question: From NCERT | NEET || [Difficult level:Easy] |||

.Which of the following is not an annelid?

(1) Leech

(2) Earhtworm

(3) Sea mouse

(4) Sea cucumber

.

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Answer ▽ ✅Verified

(4) Sea cucumber

Coelenterata (Cnidaria)

Examples: Physalia (Portuguese man-of-war), Adamsia (Sea anemone),

Pennatula (Sea-pen), Gorgonia (Sea-fan) and Meandrina (Brain coral).

Ctenophora

sea walnuts or comb jellies

Mollusca

Examples: Pila (Apple snail), Pinctada (Pearl oyster), Sepia

(Cuttlefish), Loligo (Squid), Octopus (Devil fish), Aplysia (Seahare),

Dentalium (Tusk shell) and Chaetopleura (Chiton).

Echinodermata

Examples: Asterias (Star fish), Echinus (Sea urchin), Antedon

(Sea lily), Cucumaria (Sea cucumber) and Ophiura (Brittle star).

Osteichthyes

Examples: Marine – Exocoetus (Flying fish),

Hippocampus (Sea horse); Freshwater – Labeo (Rohu),

Catla (Katla), Clarias (Magur); Aquarium – Betta

(Fighting fish), Pterophyllum (Angel fish).

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Question: From NCERT | NEET || [Difficult level:Easy] |||

.Which of the following does not come under the Class Mammals?

(1) Flying fox

(2) Hedgehog

(3) Manatee

(4) Lamprey

.

✅

Answer ▽ ✅Verified

(4) Lamprey

Class – Cyclostomata

All living members of the class Cyclostomata are

ectoparasites on some fishes. They have an

elongated body bearing 6-15 pairs of gill slits

for respiration. Cyclostomes have a sucking and

circular mouth without jaws . Their

body is devoid of scales and paired fins.

Cranium and vertebral column are

cartilaginous. Circulation is of closed type.

Cyclostomes are marine but migrate for

spawning to fresh water. After spawning, within

a few days, they die. Their larvae, after

metamorphosis, return to the ocean.

Examples: Petromyzon (Lamprey) and Myxine

(Hagfish)

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Question: From NCERT | NEET || [Difficult level:Easy] |||

.Stinging capsules (nematocysts) are found in

(1) wasp and honeybee

(2) scorpion and cobra

(3) sea pen and sea fan

(4) cactus and Venus flytrap

.

✅

Answer ▽ ✅Verified

(3) sea pen and sea fan

Coelenterata (Cnidaria)
They are aquatic, mostly marine, sessile or free-swimming, radially
symmetrical animals (Figure 4.6). The name cnidaria is derived from the cnidoblasts or cnidocytes (which contain the stinging capsules or

nematocysts) present on the tentacles and the body. Cnidoblasts are used

for anchorage, defense and for the capture of prey (Figure 4.7). Cnidarians

exhibit tissue level of organisation and are diploblastic. They have a central

gastro-vascular cavity with a single opening, mouth on hypostome.

Digestion is extracellular and intracellular. Some of the cnidarians, e.g.,

corals have a skeleton composed of calcium carbonate. Cnidarians exhibit

two basic body forms called polyp and medusa (Figure 4.6). The former

is a sessile and cylindrical form like Hydra, Adamsia, etc. whereas, the

latter is umbrella-shaped and free-swimming like Aurelia or jelly fish.

Those cnidarians which exist in both forms exhibit alternation of

generation (Metagenesis), i.e., polyps produce medusae asexually and

medusae form the polyps sexually (e.g., Obelia).

Examples: Physalia (Portuguese man-of-war), Adamsia (Sea anemone),

Pennatula (Sea-pen), Gorgonia (Sea-fan) and Meandrina (Brain coral).

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Question: From NCERT | NEET || [Difficult level:Easy] |||

.In the given table, some organisms are classified into categories. However, there is one exception. Select the option with correctly mentioned exceptional organism.

	Organisms	Category	Exception
(1)	Penicillium, Aspergillus, Mucor	Fungi	Mucor
(2)	Cacti, Venus flytrap	Plants	Cacti
(3)	Ascaris, Nereis, Wuchereria	Aschelminthes	Nereis
(4)	Scorpion, Prawn, Anopheles	Arthropoda	Prawn

.

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Answer ▽ ✅Verified

(3)

Ascaris, Nereis, Wuchereria

Aschelminthes

Nereis

Phylum – Annelida

They may be aquatic (marine and fresh water) or

terrestrial; free-living, and sometimes parasitic.

They exhibit organ-system level of body

organisation and bilateral symmetry. They are

triploblastic, metamerically segmented and

coelomate animals. Their body surface is

distinctly marked out into segments or

metameres and, hence, the phylum name

Annelida (Latin, annulus : little ring) (Figure 4.11).

They possess longitudinal and circular muscles

which help in locomotion. Aquatic annelids like

Nereis possess lateral appendages, parapodia,

which help in swimming. A closed circulatory

system is present. Nephridia (sing. nephridium)

help in osmoregulation and excretion. Neural

system consists of paired ganglia (sing. ganglion)

connected by lateral nerves to a double ventral

nerve cord. Nereis, an aquatic form, is dioecious,

but earthworms and leeches are monoecious.

Reproduction is sexual.

Examples : Nereis, Pheretima (Earthworm) and

Hirudinaria (Blood sucking leech).

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Question: From NCERT | NEET || [Difficult level:Easy] |||

.Select the option that correctly matches characteristic features with the group of three animals.

(1) Skeleton of spicules − Sycon, Adamsia, Spongilla

(2) Excretion by flame − Taenia, Fasciola, Ancylostoma

(3) Mouth contains radula − Dentalium, Octopus, Ophiura

(4) Jointed appendages − Limulus, Apis, Laccifer

.

✅

Answer ▽ ✅Verified

(4) Jointed appendages − Limulus, Apis, Laccifer

Phylum – Porifera

Members of this phylum are commonly known
as sponges. They are generally marine and mostly
asymmetrical animals . These are
primitive multicellular animals and have cellular
level of organisation. Sponges have a water
transport or canal system. Water enters through
minute pores (ostia) in the body wall into a central
cavity, spongocoel, from where it goes out
through the osculum. This pathway of water
transport is helpful in food gathering, respiratory
exchange and removal of waste. Choanocytes
or collar cells line the spongocoel and the canals.
Digestion is intracellular. The body is supported
by a skeleton made up of spicules or spongin
fibres. Sexes are not separate (hermaphrodite),
i.e., eggs and sperms are produced by the same
individual. Sponges reproduce asexually by
fragmentation and sexually by formation of
gametes. Fertilisation is internal and development
is indirect having a larval stage which is
morphologically distinct from the adult.

Examples: Sycon (Scypha), Spongilla (Fresh water sponge) and Euspongia

(Bath sponge).

Coelenterata (Cnidaria)

They are aquatic, mostly marine, sessile or free-swimming, radially
symmetrical animals . The name cnidaria is derived from the cnidoblasts or cnidocytes (which contain the stinging capsules or