Number of cranial nerves in frog :
10 pairs
9 pairs
12 pairs
none of the above
A.
10 pairs
Ten pairs of cranial nerves are present in anamniotes such as fishes and Amphibians such as frog. Twelve pairs of cranial nerves are present in reptiles, birds and mammals including rabbit and humans.
The parasphenoid bone in frog forms :
base of cranium
floor of cranium
dorsal side of cranium
dorsolateral side of cranium
Which of the following structure in Pheretima posthuma plays the role of the liver of vertebrates ?
Calciferous glands
Gland cells
Chloragogen cells
Cliteller cells
The function of pineal body is to :
lighten the skin colours
control sexual behaviour
regulates the period of puberty
all of the above
Debove's membrane is a layer of :
muscular tissue
epithelial tissue
connective tissue
all of the above
In a vertebrate which germ layer forms the skeleton muscles ?
Ectoderm
Endoderm
Mesoderm
Both 'a' and 'c'
The peculiar pungent smell of cockroach is produced by the secretions of :
pheromones
flame cells
abdominal glands
cervical glands