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.

Options

A. b and e
B. a and b
C. c and e
D. b and d

Explanation

To determine the incorrect statements from the provided options, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement A**: "Ultimately all the food that is respired for life processes comes from photosynthesis."
- **Analysis**: This statement is correct. In plants, the primary source of food is indeed photosynthesis, which produces glucose that is then used in respiration.

2. **Statement B**: "The energy released by oxidation in respiration is directly used for the life processes."
- **Analysis**: This statement is incorrect. The energy released during respiration is not used directly; it is released in a series of steps, and the energy is ultimately captured in the form of ATP, which is then used for life processes.

3. **Statement C**: "The carbon skeleton produced during respiration is used as precursors for biosynthesis of other molecules in cell."
- **Analysis**: This statement is correct. The carbon skeletons produced during respiration can indeed serve as precursors for the synthesis of other biomolecules.

4. **Statement D**: "Plants, unlike animals, have no specialised organs for gaseous exchange but they have stomata and lenticels for this purpose."
- **Analysis**: This statement is correct. Plants do not have specialized organs like lungs for gas exchange; instead, they utilize stomata and lenticels.

5. **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."
- **Analysis**: This statement is incorrect. The process of respiration involves multiple steps, and energy is not released in a single step but rather through a series of reactions, ultimately leading to the production of ATP.

### Conclusion:
The incorrect statements are **B** and **E**.