chloroplast is the cell organelle which gives green colour to the leaf. It produces glucose and then it is converted into sucrose and then transported to whole the plant body or wherever required,.
what is the need of chloroplast
it prepares food
chloroplast does not prepare food. Chloroplast is a plastid and it has a green pigment chlorophyll which helps in capturing sunlight. So, chloroplast does not make food it helps in capturing sunlight for photosynthesis.
i have written it in the answer
But still did you understand the question?