Arya went to a bird sanctuary with her family. She saw numerous birds there and was amazed by the colourful and vibrant world of flying birds. She also saw ostriches there but they were not flying seeing this, she asked her mother (who is an ornithologist) why only birds can fly, while all other animals cannot. She also asked her mother about the birds that cannot fly.
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Arya went to a bird sanctuary with her family. She saw numerous birds there and was amazed by the colourful and vibrant world of flying birds. She also saw ostriches there but they were not flying seeing this, she asked her mother (who is an ornithologist) why only birds can fly, while all other animals cannot. She also asked her mother about the birds that cannot fly.
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(i) (a) Birds have aerial mode of life. They spend most of
the time in air. Characteristic features of Aves are
the presence of feathers.
(b) The body is usually streamlined. It is divided into
(c) rieckouemk amitinilight feathers. It acts as
insulator and helps in flight. Most of them fly
except the flightless birds (e.g., ostrich). The skin is
dry without glands except the oil gland at the base of
the tail.
(ii) Endoskeleton is fully ossified (i.e., bony) and is made up
of delicate and light bones with air cavities (pneumatic
bones).
(iii) Flightless birds are emu, kiwi, rhea, Struthio, penguin,
etc.
(iv) It reflects her curiosity to know and correlate the
information.