1
Question
Read the following statements and find out the incorrect statements.
a. Ultimately all the food that is respired for life processes comes from photosynthesis.
b. The energy released by oxidation in respiration is directly used for the life processes.
c. The carbon skeleton produced during respiration is used as precursors for biosynthesis of other molecules in cell.
d. Plants, unlike animals, have no specialised organs for gaseous exchange but they have stomata and lenticels for this purpose.
e. During oxidation within a cell, all the energy contained in respiratory substrates is released free into the cell in a single step, which is trapped as chemical energy in the form of ATP.
Read the following statements and find out the incorrect statements.
a. Ultimately all the food that is respired for life processes comes from photosynthesis.
b. The energy released by oxidation in respiration is directly used for the life processes.
c. The carbon skeleton produced during respiration is used as precursors for biosynthesis of other molecules in cell.
d. Plants, unlike animals, have no specialised organs for gaseous exchange but they have stomata and lenticels for this purpose.
e. During oxidation within a cell, all the energy contained in respiratory substrates is released free into the cell in a single step, which is trapped as chemical energy in the form of ATP.
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Solution
The correct option is C b and e
Incorrect statements
Statement b:
The energy released by oxidation in respiration is directly used for the life processes.
Elaboration:
The energy released by oxidation of complex molecules is trapped by the cell to synthesize ATPs. These ATPs are then utilised by the cells wherever and whenever required to carry out any metabolic processes.
Incorrect statements
Statement e:
During oxidation within a cell, all the energy contained in respiratory substrates is released free into the cell in a single step, which is trapped as chemical energy in the form of ATP.
Elaboration:
During oxidation within a cell, all the energy contained in respiratory substrates is not released free into the cell in a single step. Rather it is released in a sequence that involves slow-step wise reactions catalyzed by enzymes. Thus, the energy released is trapped in the cell in the form of ATPs in a stepwise manner.
Final answer
(A) b and e
Incorrect statements
Statement b:
The energy released by oxidation in respiration is directly used for the life processes.
Elaboration:
The energy released by oxidation of complex molecules is trapped by the cell to synthesize ATPs. These ATPs are then utilised by the cells wherever and whenever required to carry out any metabolic processes.
Incorrect statements
Statement e:
During oxidation within a cell, all the energy contained in respiratory substrates is released free into the cell in a single step, which is trapped as chemical energy in the form of ATP.
Elaboration:
During oxidation within a cell, all the energy contained in respiratory substrates is not released free into the cell in a single step. Rather it is released in a sequence that involves slow-step wise reactions catalyzed by enzymes. Thus, the energy released is trapped in the cell in the form of ATPs in a stepwise manner.
Final answer
(A) b and e
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