Question

(D) none
45. In birds gizzard stones are found whhich are known as
(A) pebbles
(B) gastroliths
(C) pieces
(D) none
46. Salivary gland in birds arre
(A) many
(B) few
(C) absent
(D) none
47. Sternum in birds is
(A) poorly developed
(B) well developed
(C) absent
(D) none​

Answer 1

Answer:

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Explanation:

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Answer 2

45)

Gizzard stones

A bird swallows small bits of gravel that act as 'teeth' in the gizzard, breaking down hard food such as seeds and thus helping digestion. These stones are called gizzard stones or gastroliths and usually become round and smooth from the polishing action in the animal's stomach.

46)

Birds in general possess a series of paired salivary glands, which are usually described as mucous in nature (McLelland, 1979). Some birds, however, are said to possess seromucous cells that may secrete amylase (Jerrett and Goodge, 1973; Nagato and Tandler, 1986).

47)

Birds have a lightweight skeleton made of mostly thin and hollow bones. The keel-shaped sternum (breastbone) is where the powerful flight muscles attach to the body. Birds have a smaller total number of bones than mammals or reptiles