Which one among the following is an example of endothermic process?

An endothermic process is a chemical or physical change that absorbs energy from its surroundings [2]. Photosynthesis is a classic example of an endothermic reaction because it requires a continuous input of energy, specifically light energy absorbed by chlorophyll, to convert carbon dioxide and water into glucose and oxygen [3]. In contrast, the other options are exothermic processes that release energy. Combustion of carbon (burning of fuels) releases heat and light. Mixing an acid and an alkali is a neutralization reaction that typically results in a temperature rise as energy is released to the surroundings [3]. Respiration is also an exothermic process where glucose is broken down to provide energy for cellular activities [1][3]. Therefore, photosynthesis is the only endothermic process among the choices provided [1].

Sources

1. [2] Science , class X (NCERT 2025 ed.) > Chapter 1: Chemical Reactions and Equations > What you have learnt > p. 14
2. [3] Science , class X (NCERT 2025 ed.) > Chapter 5: Life Processes > QUESTIONS > p. 82
3. [1] Science , class X (NCERT 2025 ed.) > Chapter 1: Chemical Reactions and Equations > QUESTIONS > p. 7