Plants need lots of light to stay healthy. The reason for this is that there are millions of cells coating the leaves and stems, which need a certain amount of light to stay a…live. The light from the sun is stored in the cells as energy or food. Inside a plant cell, there are tiny structures called chloroplasts. They are the structures that provide the cell with energy. Chloroplasts are organelles (structures within cells) that trap light energy and convert it into chemical energy, which is then stored in the cell. The process is called photosynthesis, and involves synthesizing (building) sugar molecules from the inorganic compounds carbon dioxide (CO 2 ) and water (H 2 O). Within chloroplasts there are membranes in which are embedded molecules of chlorophyll, which is essential for the trapping of light energy. Chloroplasts have their own DNA, with more than 80 genes, and are believed to be descendants of ancestral free-living prokaryotes, which formed an endosymbiotic relationship with larger cells. Chloroplasts are found in all types of plants and algae..
More detail of their responsibility: Chloroplasts are responsible for the green color of almost all plants and are lacking only in plants that do not make their own food, such as fungi and non-green parasitic or saprophytic higher plants. The chloroplast is generally flattened and lens shaped and consists of a body, or stroma, in which are embedded from a few to as many as 50 submicroscopic bodies (the grana) made up of stacked, disk-like plates. The chloroplast contains chlorophyll pigments, as well as yellow and orange carotenoid pigments. Chloroplasts are thus the central site of the photosynthetic process in plants. The chloroplasts of algae are simpler than those of higher plants and may contain special, often conspicuous, starch-accumulating structures called pyrenoids. CHLOROPLASTS ARE IMPORTANT FOR PHOTOSYNTHESIS. THEY CONSIST OF THYLAKOIDS WHICH INTURN CONTAIN CHLOROPHYLL WHICH ABSORB LIGHT AND CARRY PHOTOSYNTHESIS Chloroplast's are the organelle in which photosynthesis takes place. Photosynthesis is the chemical process in which sugar is made using water and the sun's energy. Basically without getting into all the main details chloroplasts capture energy and converts it into food that the cell can use. (MORE)