Different colours of frog skin are controlled by:

• hormones

• melanocytes

• nervous system

• both 'a' and 'c'

172.

Blastula of frog has :

• blastopore

• blastocoel

• arahenteron

• gastropore

Carotene pigment is found in the cells of

• dermis

• epidermis

• adipose cell

• both 'b' and 'c

Debove's membrane is a layer of :

• muscular tissue

• epithelial tissue

• connective tissue

• all of the above

The function of pineal body is to :

• lighten the skin colours

• control sexual behaviour

• regulates the period of puberty

• all of the above

Chloragogen cells of earthworms are analogous to vertebrate :

• lungs

• liver

• gut

• kidneys

Striped muscles are characterised by

• syncytial

• spindle shape

• uninucleate

• none of the above

Number of cranial nerves in frog :

• 10 pairs

• 9 pairs

• 12 pairs

• none of the above

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 parasphenoid bone in frog forms :

• base of cranium

• floor of cranium

• dorsal side of cranium

• dorsolateral side of cranium