The ganglia of sympathetic and the central nervous system in frog develops from the
neural plate cells
neural crest cells
The parasphenoid bone in frog forms :
base of cranium
floor of cranium
dorsal side of cranium
dorsolateral side of cranium
A frog has its brain crushed. But when pinched on the leg, The leg draws away. It is an example of
neurotransmitter incluced response
automated motor response
The peculiar pungent smell of cockroach is produced by the secretions of :
Non-cellular layer that connects inner surface of the epithelial tissue to the connective tissue is
either (b) or (c).
Assertion : Leaf butterfly and stick insect show mimicry to dodge their enemies.
Reason : Mimicry is a method to acquire body colour blending with the surroundings.
If both Assertion and Reason are true and the reason is the correct explanation of the assertion
If both Assertion and Reason are true but the reason is not the correct explanation of the assertion
If Assertion is true statement but Reason is false
If both Assertion and Reason are false statements
Tadpoles can be made to grow in size and become adult by
injecting thyroxine hormone
feeding the eggs of other frogs
injecting gonadotrophic hormones
providing them with suitable climatic conditions
Which of the following structure in Pheretima posthuma plays the role of the liver of vertebrates ?
Chloragogen cells of Pheretima posthuma are analogous to liver of vertebrates. They are said to be excretory. They may also store the reserve food material and manufacture glycogen from fatty acids.