Multiple Choice QuestionsAssertion: 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.
The sugarcane plant has
dumb-bell shaped guard cells
pentamerous flowers
reticulate venation
capsular fruits.
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
A.
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
C4 photosynthetic pathway is more efficient than C3 pathway as C4 plants can pick up CO2 even when it is found in low concentration. PEP enzymes shows high affinity for CO2. C4 plants contain two types of chloroplast : bundle sheath chloroplast and mesophyll chloroplast. Bundle sheath cells contain Calvin cycle enzymes. Due to high concentration of CO2 in bundle sheath cells, RuBP carboxylase works only for Calvin cycle and not for photorespiration.
Photorespiration works to undo the act of photosynthesis in C3 plants. No energy rich compound is produced in this process. When temperature increase more and more photosynthetically fixed carbon is lost by photorespiration, thus reducing the efficiency of C3 plants.
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
Hill reaction occurs in:
high altitude plants
total darkness
absence of water
presence of ferricyanide
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
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
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
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