1. Tardigrade
  2. Question
  3. Biology
  4. 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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Q. 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 $ATP$

Respiration in Plants

Solution:

$•$ Oxidation of glucose occurs not in one step but in several small steps enabling some steps to be just large enough such that the energy released can be coupled to ATP synthesis
$•$ During oxidation within a cell, all the energy contained in respiratory substrates is not released free into the cell, or in a single step
$•$ It is released in a series of slow step-wise reactions controlled by enzymes, and it is trapped as chemical energy in the form of ATP
Hence, it is important to understand that the energy released by oxidation in respiration is not (or rather cannot be) used directly but is used to synthesise ATP, which is broken down whenever (and wherever) energy needs to be utilised.