Multiple Choice QuestionsThe organelles, those take part in photorespiration are :
chloroplast and mitochondria
chloroplast, mitochondria and peroxisome
mitochondria and peroxisome
mitochondria only
In case of C4 plants the acceptor of CO2 is-
Phosphoglyceraldehyde
Ribulose monophosphate
Phosphoenol pyruvate
Ribulose diphosphate
The first step in dark reaction of photosynthesis is :
formation of ATP
ionization of water
attachment of CO2 to a pentose sugar
excitement of electron of chlorophyll by a photon of light
Sugarcane show high efficiency of CO2 fixation because of :
Calvin cycle
Hatch and Slack cycle
TCA cycle
greater sunlight
The photorespiratory carbon-oxidation cycle involves the interaction of
chloroplast
mitochondria
peroxisomes
all of these
D.
all of these
Photorespiration is a metabolic pathway that occurs in plants in the presence of light, in which ribulose bisphosphate carboxylase/oxygenase the (RuBisCO) enzyme involved in carbon dioxide fixation with ribulose bisphosphate, accepts oxygen, in place of carbon dioxide, resulting in the formation of a twocarbon compound, glycolate. Most of the fixed carbon represented by the glycolate can be salvaged by a series of reactions-the glycolate pathway involving the peroxisomes and mitochondria, and returned to the chloroplasts. However, some of the carbon is lost as carbon dioxide. Unlike respiration there is no production of ATP.
Assertion : The collenchyma is a thick walled living tissue.
Reason : The collenchyma is thickened due to the deposition of pectin.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both the assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both the assertion and reason are false.
Assertion : When six molecules ofcarbon dioxide participate in photosynthesis, 12 molecules of NADP and 18 ATP are used up, forming one hexose molecule.
Reason : The photosynthetic light reaction results in the formation of ATP and NADPH.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both the assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false.
If both the assertion and reason are false.
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