Which of the following structure in Pheretima posthuma plays the role of the liver of vertebrates ?
The ganglia of sympathetic and the central nervous system in frog develops from the
neural plate cells
neural crest cells
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
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
The peculiar pungent smell of cockroach is produced by the secretions of :
Pheromones are the secretion of small amount of chemical substances leading to specific physiological or behavioural responses in other members of the same species. They are mainly used to induce mating.
Non-cellular layer that connects inner surface of the epithelial tissue to the connective tissue is
either (b) or (c).
The parasphenoid bone in frog forms :
base of cranium
floor of cranium
dorsal side of cranium
dorsolateral side of cranium