Multiple Choice QuestionsSugarcane 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.
Photorespiration usually occurs in
one cell organelle
two cell organelles
three cell organelles
four cell organelles
Stomata opens
in day time - for gaseous exchange
in day time- no gaseous exchange
in night time only - for gaseous exchange
in night time only - no gaseous exchange
Which of the following statements about phytochrome is true?
Pr absorbs yellow light and becomes Pfr
Pr absorbs red light and becomes Pfr
Pfr absorbs red light and becomes Pr
Pfr absorbs yellow light and becomes Pr
Switch
