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.