"Respiration is an exothermic process because heat is evolved. When we burn anything, we use oxygen, and thus we oxidize the substance. Also heat energy is released. So respiration is also the burning of molecules of food, as we are oxidizing it, heat is evolved. So heat evolution is a must. Thus respiration is an exothermic process". (OR)

"Carbohydrates present in food are broken down to form glucose. This glucose combines with oxygen in the cells of our body and provides energy. This reaction is known as Respiration. Hence Respiration is considered as Exothermic Reaction".

[In Chemistry, you have learnt the chapter Metals and Non-metals right friend? So, in that chapter, you have already know the answer that why the Sodium and Potassium should be kept in Kerosene? You know the answer that Sodium and Potassium are highly reactive elements that can easily reacts with oxygen present in the atmosphere and catches fire very easily. So, as you come to the concept of the Biology, when the food enters alimentary canal, the food what we have swallowed it had converted into Sugar or Glucose which is very reactive to Oxygen. When we inhale the oxygen, the glucose get reacts with oxygen and helps to the production of heat. So, when it reacts with oxygen, it produces heat. When we exhale, the Carbon dioxide, Water molecules, along with the release of Heat takes place.]

[Note:- This information is only for to understand the concept friend. Your answer is above. I've given two more effective answer, on these two, you can write the second one answer. Please don't worry for the long explanation friend, read the two answers what I have mentioned through double inverted commas friend...]

Respiration is an essential process that occurs in living organisms, including humans, animals, and plants. It is the process by which cells obtain energy from glucose and other organic molecules, releasing carbon dioxide and water as byproducts. Respiration is an exothermic reaction, meaning it releases energy in the form of heat.

Overview of Respiration
Respiration can be divided into two main types: aerobic respiration and anaerobic respiration. Aerobic respiration requires oxygen, while anaerobic respiration does not. In this response, we will focus on aerobic respiration, as it is the most common type in living organisms.

Chemical Equation for Aerobic Respiration
The chemical equation for aerobic respiration can be represented as follows:

C6H12O6 + 6O2 -> 6CO2 + 6H2O + Energy

This equation shows that glucose (C6H12O6) and oxygen (O2) react to produce carbon dioxide (CO2), water (H2O), and energy. The energy released during this reaction is used by cells for various processes, such as muscle contraction, cell division, and maintaining body temperature.

Exothermic Nature of Respiration
Respiration is an exothermic reaction because it releases energy. During the process of respiration, the bonds between the carbon and hydrogen atoms in glucose are broken, releasing energy. This energy is then stored in the form of adenosine triphosphate (ATP), a molecule that can be easily used by cells for energy.

Energy Release in Respiration
The energy released during respiration is in the form of heat. This heat energy is a result of the breaking and formation of chemical bonds in glucose and other molecules involved in the reaction. The breaking of bonds requires energy input, while the formation of new bonds releases energy. The overall balance of these bond-breaking and bond-forming processes results in a net release of energy.

Significance of Exothermic Respiration
The exothermic nature of respiration is crucial for the survival and functioning of living organisms. The energy released during respiration is used for various vital processes, including growth, reproduction, movement, and maintaining body temperature. Without this energy, organisms would not be able to perform necessary tasks and would eventually die.

In conclusion, respiration is an exothermic reaction because it releases energy in the form of heat. The energy released during respiration is used for various cellular processes, and without it, organisms would not be able to survive.