Respuesta :
Photosynthesis is the base of energy flow, because it converts energy from the sun into fuel for plants and animals.
The biosphere is the combination of the all the ecosystem present on the earth.
In a biosphere the plants are the organism, which convert the energy of the sunlight in to food (usable form of energy for the consumers) by the process of photosynthesis. The food is transferred from the the producers (plants) to the animals (consumers).
In case, the photosynthesis does not occur, the organism present in the biosphere cannot utilise the energy.
