Which of the following is/are unique characteristic/s of mammals?
a) skin is glandular with sweat and sebaceous glands, mammary glands in female
b) brain is well developed with two large cerebral hemisphere (12 pairs nerves)
c) ear have an external pinna for collection sound waves, senses well developed
d) all of these
Which of the following is/are the character/s of circulatory system of mammals?
a) four chambered heart with complete separation of blood and left aortic arch
b) red blood due to haemoglobin, non nucleated RBCs
c) heart is double pump and circulation is closed
d) all of these
To absorb nutrition from mother, a glandular tissue develops between foetus and uterine wall of the mother in mammals called…….
a) amnion
b) placenta
c) notochord
d) umbilical cord
Mammals have divided into……sub-classes.
a) two
b) three
c) four
d) five
Explanation: 1. Prototheria or monotremata, 2. Metatheria or marsupials, 3. Eutheria or placentalia
Which of the following sub-class mammals are the most primitive mammals?
a) Prototheria
b) Metatheria
c) Eutheria
d) both a and b
Explanation: also called egg laying mammals (reptilian character)
The mammals of sub-class prototheria are……..
a) oviparous
b) ovoviviparous
c) viviparous
d) none of these
Explanation: they lay eggs but kept in the uterus where they are fertilized and developed.
