Question

During the process of respiration
(A)Light is evolved
(B)Heat is evolved
(C)Both light and heat are evolved.
(D)Neither heat nor light is evolved

Answer 1

Hint: During the respiration process, the food is broken down by the release of energy. When there is an increase in the respiration process, the breakdown of the glucose molecule occurs which results in the evolution of energy in a different form.

Complete answer:
During the process of respiration the energy is released in the form of heat. Respiration is a process by which food is broken down into simpler substances by the release of energy. Respiration is also mentioned as a process involving the passage of air and the production of body heat.
The respiratory system is the integrated system of organs involved within the intake and exchange of oxygen and carbohydrates between an organism and therefore the environment.

Additional Information: The physiological definition of respiration is different from the biochemical definition, which refers to a biological process by which an organism obtains energy (in the form of ATP and NADPH) by oxidizing nutrients and releasing waste products. As you know that the physiologic respiration is important to sustain respiration and thus life in animals, the processes are distinct: respiration takes place in individual cells of the organism, while physiologic respiration concerns the diffusion and transport of metabolites between the organism and therefore the external environment. Further, respiration is divided into two parts i.e aerobic respiration and anaerobic respiration. Aerobic respiration takes place in presence of oxygen and anaerobic respiration takes place in the absence of respiration.
So, the correct answer is ‘Heat is evolved’.

Note: Breathing and Respiration, both are very confusing terms. Breathing is defined as a biophysical process in which the exchange of gases takes place through inhalation and exhalation. On the other hand, respiration is a biochemical process to release energy from organic compounds which are then used for performing different physical activities.