Mitochondria are storehouses of

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Hint: Mitochondria is the cell organelle in which the aerobic part of cellular respiration takes place as the reactions of the Krebs cycle and electron transport system (ETS) takes place here. Respiration occurs in the body to breakdown food molecules such as glucose and to receive energy.

Complete answer:
Mitochondria are known as the powerhouse of the cell because it stores ATP in it which is the energy currency of the cell. This ATP is formed by the reactions of the Krebs cycle in the mitochondrial matrix and Electron Transport System (ETS) in the inner membrane of the mitochondria. These reactions produce a large number of ATP. ETS builds an electrochemical gradient of protons across the inner membrane which store potential energy in them. When a proton flows out of this inner membrane, energy is released which is trapped by the ATP synthetase complex to produce ATP.

Additional Information: Let us know more about the cell organelle mitochondria (singular: mitochondrion).
-Mitochondria is not easily seen in the microscope unless stained by special stains like Janus green.
-The number of mitochondria in a cell depends upon the physiological activity it has to perform.
-The mitochondrion is made up of a double membrane structure known as the outer membrane and inner membrane.
-These membranes divide the mitochondria into an outer compartment and an inner compartment.
-The inner compartment is filled with a dense homogeneous substance known as the matrix whereas the outer compartment has infoldings towards the matrix known as the cristae.
-Different types of enzymes are present on each of the membranes according to the functions they need to perform.
So, the correct option is ‘ATP’.

Note: -Mitochondria and chloroplasts are semiautonomous organelles which means they have their own DNA and protein synthesis machinery but are dependent on the nucleus for some functions.
-Mitochondria and chloroplasts are known as endosymbionts which means that they are prokaryotic bacteria that started living inside the eukaryotic cells as symbionts.
-A structure analogous to mitochondria is seen in prokaryotes known as mesosomes.