Which of the following are true about the reproduction of birds?
a) sexes separate, sexual dimorphism absent, fertilization internal, only left ovary
b) hermaphrodite, sexual dimorphism found, fertilization internal, right ovary
c) sexes separate, sexual dimorphism found, fertilization external, only left ovary
d) sexes separate, sexual dimorphism found in most birds, fertilization internal, only left ovary
Explanation: female have shell secreting glands
The animals belong to class aves are……
a) oviparous
b) ovoviviparous
c) viviparous
d) both a and b
Explanation: egg with considerable amount yolk with calcareous shell
Birds are amniotes and have…….membrane/s along amnion.
a) yolk sac
b) chorion
c) allontoise
d) all of these
On the basis of flight, birds are of...types.
a) two
b) three
c) four
d) five
Explanation: 1. Flightless or running birds and 2. Flying birds
Which of the following is/are the characteristic/s of running birds?
a) bones are not hollow
b) sternum is not keel
c) tail feathers irregular
d) all of these
Explanation: e.g. ostrich, emu, kiwi, cassowary, penguin etc
Which of the following is/are the characteristic/s of flying birds?
a) bones are hollow and light weight
b) sternum is keel
c) have strong wings for flight, tail feathers well developed
d) all of these
Explanation: e.g. pigeon, sparrow, parrot etc.
