The chlorophyll pigment is concentrated in the leaves of plants - though it is also present in other parts such as the stems of many herbaceous plants, flower buds and certain fruits and occasionally roots. This glucose is then transported all round the plant for use as required. Some is oxidised for energy, some is stored as insoluble starch when it is not required immediately. Some is taken to fruits and accumulated there. Some is used to make proteins utilising nitrogen from the soil.
All plants live and grow by photosynthesis.
Some animals eat other animals, but if you follow the food chain back you will find that green plants are always at the base. Animals and plants die and decay, releasing minerals into the soil and CO2 into the air for green plants to use for photosynthesis. If green plants were to suddenly disappear, then so would virtually all life on Earth - including Homo Sapiens. Green leaves are thus the powerhouses - the great driving force for Life on Earth. Photosynthesis is the life generating chemical process.