CBSE
Multiple Choice QuestionsStomata open at night and closes during day in
xerophytes
gametophytes
mesophytes
mesophytes
Assertion: Photosynthetically C4 plants are less efficient than C3 plants.
Reason: The operation of C4 pathway requires the involvement of only bundle-sheath cells.
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 falsen
If both assertion and reason are false.
During photosynthesis
both CO2 and water get oxidized
both CO2 and water get reduced
water is reduced and CO2 is oxidized
CO2 gets reduced and water gets oxidized
Which one of the following pairs is correctly matched?
Rhizobium - Parasite in the roots of leguminous plants
Mycorrhizae - Mineral uptake from soil
Yeast - Production of biogas
Myxomycetes - The disease ring worm
Photorespiration in C3 plants starts from:
phosphoglycerate
phosphoglycolate
glycerate
glycine
Assertion : C4 photosynthetic pathway is more efficient than the C3 pathway.
Reason : Photorespiration is suppressed in C4 plants.
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 but Reason is false
If both Assertion and Reason are false
Assertion : Rhoeo leaves contain anthocyanin pigments in epidermal cells.
Reason : Anthocyanins photosynthetic pigments.
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
The sugarcane plant has
dumb-bell shaped guard cells
pentamerous flowers
reticulate venation
capsular fruits.
Hill reaction occurs in:
high altitude plants
total darkness
absence of water
presence of ferricyanide
Assertion : The atmospheric concentration of CO2 at which photosynthesis just compensates for respiration is referred to as CO2 compensation point.
Reason : The CO2 compensation point is reached when the amount of CO2 uptake is less than that generated through respiration because the level of CO, in the atmosphere is more than that required for achieving CO2 compensation point.
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 but Reason is false
If both Assertion and Reason are false
