Which of the following are the distinguishing characters of birds (aves)?
a) homoeothermic, feathers, body flat, bipedal, sternum keel, toothless jaw
b) poikilothermic, feathers, body fusiform, bipedal, sternum keel, toothless jaw
c) homoeothermic, feathers, body fusiform, bipedal, sternum keel, toothless jaw
d) homoeothermic, feathers, body fusiform, bipedal, sternum keel, teeth in jaws
Digestive system of birds has a……to store food and a…….to grind it.
a) crop – intestine
b) crop – gizzard
c) stomach – oesophagus
d) gizzard – stomach
Which
of the following are correct about the circulatory system of birds?
a) three chambered heart, single aortic arch, blood red, nucleated RBCs
b) four chambered heart, single aortic
arch, blood red, nucleated RBCs
c) four chambered heart, two aortic arches, blood red, anucleated RBCs
d) four chambered heart, no aortic arch, blood red, polynucleated RBC
Explanation: heart with two auricles and two ventricles
Vocal cords are not present in the larynx of the birds but a special sound box……is present at the junction of trachea and bronchi.
a) pharynx
b) syrinx
c) larynx
d) nictitating membrane
In which of the following vertebrates, lungs are provided with extra air spaces?
a) reptiles
b) birds
c) mammals
d) fishes
Explanation: these air sacs are extended to in to viscera
Which of the following is/are true about class aves vertebrates?
a) eye with nictitating membrane
b) a rudimentary pinna
c) metanephric kidneys
d) all of these
Explanation: ureters open to common coaca and nitrogenous wastes are excreted in the form of semisolid urates
