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Write the features of digestive system and circulatory system of reptiles.
Digestive system in reptiles is well-developed with acrodont teeth in both jaws. Reptiles have three-chambered heart with two auricles and one ventricle.
Digestive system in reptiles is well-developed with
See lessacrodont teeth in both jaws. Reptiles have
three-chambered heart with two auricles and one
ventricle.
Which animals have compound eyes? What other sense organs are present in these animals?
Arthropods have compund eyes. Aquatic forms of arthropods also have statocysts for balancing.
Arthropods have compund eyes. Aquatic forms of
See lessarthropods also have statocysts for balancing.
Describe the type of excretory and circulatory system in Annelida.
Annelids have closed circulatory system and excretory organs are nephridia. Nephridia are present in each segment.
Annelids have closed circulatory system and
See lessexcretory organs are nephridia. Nephridia are present
in each segment.
Name some diseases caused by roundworms.
Ascariasis caused by roundworm or Ascaris.
Ascariasis caused by roundworm or Ascaris.
See lessName the phylum in which pseudocoelom is present.
Aschelminthes
Aschelminthes
See lessWhat is the bilateral symmetry?
In bilateral symmetry, the body can be divided into identical left and right halves in only one plane.
In bilateral symmetry, the body can be divided into
See lessidentical left and right halves in only one plane.
Which animals have tissue level of organisation?
Members of Cnidaria and Ctenophora have tissue level of organisation.
Members of Cnidaria and Ctenophora have tissue
See lesslevel of organisation.
Which factors were responsible for the extinction of dinosaurs(ancient reptiles)?
During the Jurassic period of Mesozoic era, certain gigantic reptiles roamed on land, swarm in water and flew in the air. These reptiles were called dinosaurs. These animals disappeared during a short time at the end of the cretacean period. Their extinction occurred due to competition with early maRead more
During the Jurassic period of Mesozoic era, certain
See lessgigantic reptiles roamed on land, swarm in water and
flew in the air. These reptiles were called dinosaurs.
These animals disappeared during a short time at the
end of the cretacean period.
Their extinction occurred due to competition with early
mammals or from climatic changes due to the collision of a
large meteorite with the earth. The collision must have
produced huge dust clouds into the air, screening sunlight
from the earth. The lack of sunlight would have destroyed
vegetation and cooled the atmosphere. These may be the
reason for extinction of dinosaurs.
Reasons for successful adaptation on land by reptiles are
(i) Horny scales which reduce loss of water.
(ii) Internal fertilisation as gametes cannot survive on
land.
(iii) Shell around the egg to check desiccation.
(iv) Fluid-filled amnion around the embryo to provide
aquatic environment for development on land.
Which features make mammals as most successful and dominant animals?
Features which make mammals as dominant and successful animals are (i) The presence of an insulating and protective hairy exoskeleton. (ii) They are warm-blooded so have high rate of metabolism. (iii) They are viviparous animals and show placentation and intrauterine development which increases theRead more
Features which make mammals as dominant and
See lesssuccessful animals are
(i) The presence of an insulating and protective hairy
exoskeleton.
(ii) They are warm-blooded so have high rate of
metabolism.
(iii) They are viviparous animals and show placentation
and intrauterine development which increases the
chances for survival of young ones.
(iv) They show high degree of parental care.
(v) They have more developed hearing efficiency due to
the presence of pinna, three ear-ossicles and coiled
cochlea in the ear.
(vi) They are able to speak through indicative/verbal
language.
(vii) They have good power of learning due to the presence
of more developed brain.
(i) List out some flightless birds. (ii) Describe briefly any four with their important features. (iii) Write the name of any two extinct flightless birds.
(i) The flightless birds are ostrich, rhea, kiwi, penguin, cassowary, emu, and Island rail. (ii) (a) Ostrich (Struthio) is the largest living flightless bird also called as Shutarmurg (in Hindi). It has largest eyes of any land animal. It swallows small stones to aid their digestion of vegetable matRead more
(i) The flightless birds are ostrich, rhea, kiwi, penguin,
See lesscassowary, emu, and Island rail.
(ii) (a) Ostrich (Struthio) is the largest living flightless
bird also called as Shutarmurg (in Hindi). It has
largest eyes of any land animal. It swallows small
stones to aid their digestion of vegetable matter.
It can run at the speed to 60 km/hr. Ostrich lays
the largest egg produced by any living bird. It is
commonly found in deserts of Africa and Arabia.
(b) Rhea is smaller than ostrich but similar to it in
many habits. Its head and neck are feathered not
naked as in ostrich. It is found in South America.
(c) Emu (Dromaius) is the second largest living bird
It is confined to Australia.
(d) Kiwi (Apteryx) has most sensitive beak among
birds.’lt can detect worms in the ground. It lays
largest egg in proportion to its own size. It is the
New Zealand’s Emblem bird.
(iii) Extinct flightless birds are
(a) Dodo of Mauritius became extinct in 1681.
(b) Moais of New Zealand.