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Phylum: Arthropoda

They have the following characteristics:

  1. Body is segmented and divided into three parts. They are head, thorax, and abdomen.
  2. They have usually three pairs of jointed legs and two pairs of wings.
  3. They have compound eyes and feelers.
  4. Sexes are separate and life cycle completes in four phases i.e. egg, larva, pupa, and adult.
  5. Their body is covered externally with an exoskeleton.
  6. Their mouthparts are well developed for chewing, piercing and sucking.
  7. They are unisexual i.e. mal;e and female sex are separate

The phylum arthopoda are divided into four classes. They are crustacean, insecta, myriapoda, and arachnida.

Class: Crustacea
  1. They are aquatic animals.
  2. Head and thorax are fused to form a cephalothorax.
  3. Respiration takes either by gills or general body surface.
  4. Head bears a pair of compound eyes and five pairs of appendages.

Examples: prawn, crab, cray-fish etc.

Class: Insecta
  1. They are mostly terrestrial and rarely aquatic.
  2. The body is divided into three parts: head, thorax, and abdomen.
  3. Head bears a pair of compound eyes and a pair of antenna.
  4. Thorax bears three parts of legs and one or two pairs of wings.

Examples: grasshopper, termite, butterfly, housefly etc.

Class: Arachnida
  1. The animals of this class are terrestrial.
  2. The body is divided into two parts: cephalothorax and abdomen.
  3. They have four pairs of walking legs.
  4. They do not have compound eyes and feelers.

Examples: spider, scorpion, mite etc.

Phylum: Mollusca

  1. They have a soft body which is usually covered with a calcareous shell.
  2. Body is divided into head, visceral mass, and foot.
  3. The head bears mouth, tentacles, and sense organ.
  4. Their body is not symmetrical.
  5. They are unisexual.
  6. They have well- developed organ system.
  7. They are haemocoelomateanimals.

Examples: snail, slug etc.

Phylum: Echinodermata

They have the following characteristics:

  1. The body of these animals is soft and unsegmented.
  2. The body is covered with spine, which is made up of calcareous shell except octopus.
  3. Their body maybe star-like, elongated etc.
  4. They do not have a distinct head.
  5. They have tube feet for locomotion and peculiar system for food gathering.
  6. The mouth is situated on oral side .
  7. The anus is situated on aboral side.

Examples: starfish, sea-silly etc.

  • Arthropodans have jointed foot and are metamerically segmented animals.
  • Echinoderms are spiny skinned animals found only in marine water.
  • The body  of mollusca is soft, unsegmented and without appendages.
  • The excretory system is absent in echinodermata.
  • Body layer of phylum mollusca is triploblastic.
  • Excretion in mollusca takes place by paired metanephridia or kidney.
.

Very Short Questions

Nine phylum of Invertebrate animals are as follows:
i) Protozoa
ii) Porifera
iii) Coelenterata
iv) Plathyhelmenthes
v) Nemathelminthes
vi) Annelida
vii) Arthropoda
viii) Mollusca
ix) Echionodermata

Plasmodium
Phylum: Protozoa
i) Locomotary organs are absent.
ii) Excretion takes place through contractile vacuole.
iii) It is simplest and microscopic animals.
Sponge
i) Body contains numerous pores called ostia.
ii) It is usually fixed and branched.
iii) The nervous or sensory cells are absent.

Any three characteristics of phylum Aschelminthes are as follows:
i) These are unisexual animals i.e. sexes are separate.
ii) Alimentary canal is straight with mouth and anus.
iii) Respiratory and circulatory system are absent.
E.g. Ascaris and hook worm.

The differences between male and female Ascaris are as follows:

Male Ascaris Female Ascaris
The posterior end is ‘c’ shaped. The posterior end is erect or slightly curved.
It is smaller than female. ii) It is larger than male.
iii) A pair of penal setae project out of the genital aperture. iii) Cloaca and penal setae are absent.

Four common features of Phylum Annelida are as follows:
i) Their body part is externally segmented.
ii) Circulatory system is closed type.
iii) Body is triploblastic, bilaterally symmetrical.
iv) Locomotion is carried out by bristle or setae. E.g. earthworm, leech etc.

The differences between tape worm and hook worm are as follows:

Tapeworm Hookworm
i) It belongs to phylum Platyhelminthes. i) It belongs to phylum Nemathelminthes.
ii) The body is flat. ii) The body is long cylindrical.
iii) Body is segmented. iii) Body is not segmented.

Those organisms in which both male and female sex organs are found in the single body are called hermaphrodite. E.g. earthworm.

Earthworms live in burrows which makes soil porus and soft. So, that air can pass easily as well as rate of absorption of water increases. Thus, earthworms acts as natural ploughers.

Three features of phylum arthropoda are as follows:
i) Body is segmented and divided into three parts i.e. head, thorax and abdomen.
ii) They have jointed legs.
iii) They have compound eyes and feelers.

Phylum arthropoda is the largest phylum of animal kingdom because they are found in air, water and land. Also, that they can produce large number of young ones in each breed by different methods of reproduction. So, they are abandon in nature.

Arthropoda is subdivided into four classes. They are:
i) Crustacea
ii)Insecta
iii) Myriapda
iv) Archnida


Silver fish Jelly fish
i) It belongs to phylum arthropoda. i) It belongs to phylum coelenterate.
ii) Locomotive part is jointed legs. ii) Locomotive part is tentacle.
iii) Respiration takes place by trachea. iii) Respiratory system is absent.

Octopus falls on phylum Mollusca. It general features are:
i) Their body are unsegmented, and soft.
ii) Shell is present.
iii) They are unisexual.

The general features of phylum Echinodermata are:
i) Their body is covered with spiny-skin.
ii) They do not have distinct head.
iii) They have tube feet of locomotion.
iv) Mouth lies on the ventral surfaces.

The hard shell of Mollusca is made up of calcium carbonate.

i) Kingdom: Animal
Sub-Kingdom: Invertebrate
Phylum: Protozoa
Example: Euglena

ii) Kingdom: Animal
Sub-Kingdom: Invertebrate
Phylum: Porifera
Example: Spongilla

iii) Kingdom: Animal
Sub-Kingdom: Invertebrate
Phylum: Coelenterata
Example: Coral

iv) Kingdom: Animal
Sub-Kingdom: Invertebrate
Phylum: Platyhelminthes
Example: Liver fluke

v) Kingdom: Animal
Sub-Kingdom: Invertebrate
Phylum: Nemathelminthes
Example: Hookworm

vi) Kingdom: Animal
Sub-Kingdom: Invertebrate
Phylum: Annelida
Example: Leech

vii) Kingdom: Animal
Sub-Kingdom: Invertebrate
Phylum: Arthropoda
Class: Crustacea
Example: Prawn

viii) Kingdom: Animal
Sub-Kingdom: Invertebrate
Phylum: Arthropoda
Class: Insecta
Example: Grasshopper

ix) Kingdom: Animal
Sub-Kingdom: Invertebrate
Phylum: Arthropoda
Class: Myriapoda
Example: Centipede

x) Kingdom: Animal
Sub-Kingdom: Invertebrate
Phylum: Arthropoda
Class: Archinda
Example: Spider

xi) Kingdom: Animal
Sub-Kingdom: Invertebrate
Phylum: Mollusca
Example: Slug

xii) Kingdom: Animal
Sub-Kingdom: Invertebrate
Phylum: Echinodermata
Example: Sea-cucumber

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  • Which is NOT an arthropod?

    lobster
    spider
    centipede
    clam
  • Tapeworm is an example of a _______ worm.

    segmented
    annelid
    round
    flat
  • Which arthropods have six legs?

    insects
    crustaceans
    spiders
    arachnids
  • Which animal is an echinodem?

    sea urchin
    both sea stars and sea urchins
    sea stars
    neither sea stars or sea urchins
  • Which one is reproduce by both asexual and sexual method?

    Aschelminthes
    Coelenterata
    Annelida
    Nemathhelminthes
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