Page 402 - General Knowledge

GENERAL KNOWLEDGE 2019

 Some group of animals are parasites. E.g. Tapeworm and Round worms.
Classification of Animalia kingdom
Phylum Protozoa
 They are unicellular animals.
 Made up of only one cell.
 All metabolic activities such as digestion, respiration, excretion and reproduction take place
in the unicellular body.

 Respiration and excretion occur by diffusion.
 Amoeba, Euglena and Plasmodium are some examples.
Phylum Porifera
 They are found in marine water and have porous body.
 The pores are called Ostia.
 Multicellular animals.
 Skeleton is made up of minute calcareous or siliceous spicules.
 Water enters through ostia and goes out via osculum.
 Asexual reproduction by fragmentation and sexual reproduction by gamete formation.
 Sycon, Spongilla are some examples.
Phylum Coelenterata
 They are aquatic animals.
 Thread like structures called tentacles around the mouth, help in holding the food.
 Have specialized cnidoblast cells to help in catching the food.
 Phenomenon of polymorphism and metagenesis are associated with coelenterates.

 Hydra, jelly fish, sea anemone are some examples.
 Hydra – is capable of regeneration of organs.
Phylum Platyhelminthes
 Animals of this phylum contain alimentary canal with single opening.
 Anus is absent.
 By flame cells, excretion takes place.
 Have no skeletal systems such as respiratory system, circulatory system etc.
 They are endo-parasites.
 Triploblastic and bilateral symmetry.
 Planaria, liver Fluke, tapeworm are examples.
Phylum Aschelminthes
 Long, cylindrical, unsegmented worms.
 Alimentary canal is complete with mouth and anus.

 No circulatory and respiratory system.
 Nervous system is developed.
 Excretion takes place via protonephridia.
 They are unisexual.
 Most are parasitic but some are free living in soil and water.
 Ascaria, threadworm are some examples.
Phylum Annelida
 Body is long, thin, soft and truly segmented.
 Alimentary canal is well developed.

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