Unidirectional transmission of a nerve impulse through nerve fibre is due to the fact that
nerve fibre is insulated by a medullary sheath
sodium pump starts operating only at the cyton and then continues into the nerve fibre
neurotransmitters are released by dendrites and not by axon endings
neurotransmitters are released by the axon endings and not by dendrites.
D.
neurotransmitters are released by the axon endings and not by dendrites.
A synapse occurs where the axon of one neuron (the pre-synaptic neuron) meets the dendrite of another (the post-synaptic neuron). At the tip of the pre-synaptic axon is a button shaped swelling called a synaptic knob, inside which are numerous mitochondria and vesicles packed with a substance called a neurotransmitter which at the time of nerve impulse conduction diffuse across the space and bind to receptors in the membrane of the post-synaptic cell. This opens ion channels in the post-synaptic membrane resulting in a change in its membrane potential and in the consequent generation of a nerve impulse.
Assertion: Photorespiration is a wasteful process where there is no synthesis of ATP energy.
Reason: RuBisCO is present in mesophyll cells of C4 plants hence they show more productivity.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
The checkpoint in cell cycle plays important role in
repairing DNA damage
apoptosis initiation
assessing DNA damage
none of these
Pacinian corpuscles occur in the skin of certain parts of body in mammals. These are
type of glands
pain receptors
naked tactile receptors
encapsulated pressure receptors.
An artificial pacemaker is implanted subcutaneously and connected to the heart in patients
having 90% blockage of the three main coronary arteries
having a very high blood pressure
with irregularity in the heart rhythm
suffering from arteriosclerosis
Achondroplasia is a disease related with the defect in the formation of
membrane
cartilage
mucosa
none of these
C4 plants have better productivity because
C4 plants absorb more light
C4 plants absorb more CO2
C4 plants lack photorespiration
all of these
Pick the correct group consisting of all genera exhibiting homospory
Lycopodium, Psilotum, Selaginella, Equisetum
Equisetum, Pteris, Salvinia, Psilotum
Salvinia, Pteris, Lycopodium, Selaginella
Equisetum, Psilotum, Lycopodium, Pteris
Wharton's duct is the duct of
submandibular salivary gland
parotid gland
sublingual gland
all of these
Which part of the nephron is impermeable to water
Proximal convoluted tubule
Distal convoluted tubule
Ascending limb of loop of Henle
Descending limb of loop of Henle
