Multiple Choice QuestionsWharton's duct is the duct of
submandibular salivary gland
parotid gland
sublingual gland
all of these
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
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
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.
The checkpoint in cell cycle plays important role in
repairing DNA damage
apoptosis initiation
assessing DNA damage
none of these
Achondroplasia is a disease related with the defect in the formation of
membrane
cartilage
mucosa
none 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
C4 plants have better productivity because
C4 plants absorb more light
C4 plants absorb more CO2
C4 plants lack photorespiration
all of these
C.
C4 plants lack photorespiration
Presence of photorespiration is considered as a wasteful and energy consuming process in crop plants which ultimately leads to reduction in final yield of crops. It is estimated that during C4 photosynthesis, upto 50% of the CO2 fixed may have to pass through photorespiratory process, thereby resulting in considerable decrease in photosynthetic productivity. In C4 plants, there is some loss of photosynthetic activity on account of photorespiration which is absent in C4 plants and hence they have better productivity.
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.
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.
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