DENDROLOGY

Detailed explanation-1: -The solar energy captured by the leaves is used to make food which is stored in the plant. All organisms are directly or indirectly dependent on plants for their food. Thus, the sun is the ultimate source of energy for all living organisms.

Detailed explanation-2: -The Sun is the major source of energy for organisms and the ecosystems of which they are a part.

Detailed explanation-3: -The sun is called the ultimate source of energy because it is the source of almost all energies of the earth. Plants convert light energy from the sun into chemical energy (food) by the process of photosynthesis.

Detailed explanation-4: -The correct option is A True. Sun; the ultimate source of energy: Sun is the ultimate source of energy for all the organisms on earth. The energy from the sun is directly utilized by some organisms and other organisms depend on these organisms for their energy requirement.

Detailed explanation-5: -Since, all the food on this earth is made by utilising solar energy, therefore, sun is the ultimate source of enegy for all living organisms.