DENDROLOGY

Detailed explanation-1: -ll living organisms need energy to grow and reproduce, maintain their structures, and respond to their environments; metabolism is the set of the processes that makes energy available for cellular processes.

Detailed explanation-2: -The living organism undergoes many life processes like nutrition, respiration, digestion, transportation, excretion, the circulation of blood, and also the reproduction. To perform all these life processes the organism needs energy and nutrients. The energy to the organism is mostly supplied through the food.

Detailed explanation-3: -Living organisms need energy for performing daily activities. This energy comes from food, which contains nutrients like carbohydrates, fats and proteins, which in turn provide energy to our body.

Detailed explanation-4: -Answer and Explanation: In all living organisms, the ultimate source of energy is the Sun. This is because autotrophic organisms, which are the producers in most all food chains, obtain their energy to carry out photosynthetic reactions from the Sun.