Q. Which of the following daily processes are examples of endothermic changes?

1. Melting of ice
2. Cooking of food
3. Respiration
4. Photosynthesis

Select the correct option from the codes given below:
Answer: 1, 2 & 4 only
Notes: Endothermic changes absorb energy. Melting of ice absorbs heat, cooking of food requires energy input, and photosynthesis uses sunlight energy to synthesize organic compounds. Respiration is an exothermic process, releasing energy during glucose breakdown. Hence, only 1, 2, and 4 are endothermic processes among the options listed.