The thylakoid membranes house the light harvesting pigments and the rest of the apparatus for photosynthetic ATP and NADPH synthesis. They store food materials like carbohydrates, lipid, and protein. The internal structure of chloroplasts is dominated by the flattened green membrane sacks known as thylakoids. Structure: All green plastids, for that matter every kind of plastids are surrounded by two-unit membranes; i.e. *Under stressful conditions, mitochondria have also been observed in plastids (by intrusion). They may be rod-like or spherical in shape and are of many types: outer and inner of 7 nm thick membranes and they are … This type of plastid does not have any pigments. They are necessary for essential life processes, like photosynthesis and food storage. As noted above, chloroplasts and other plastids are enriched in galactolipids (Figure 1). They are found large numbers in the cells of fruits, seeds, tubers etc. They lack grana and photosynthetic pigments. Its function largely depends on the presence of pigment s. A plastid involved in food synthesis typically contains pigment s, which are also the ones responsible for the color of a plant structure (e.g. Plastids are found in plants and some algae. A plastid is a cytoplasmic organelle involved in the synthesis and storage of food. They are found in the sex cells and in the region of the plant that does not receive light. Chloroplasts. These are colourless plastids found in the storage organs. Also Refer: Chloroplasts.
They are variously shaped, viz., oval, rod like, or filamentous. Depending on the species (species of plant, algae etc) plastids may take up a variety of shapes ranging from discoid, spherical, dumbbell-shaped or lens-shaped among a few others. Chloroplasts are biconvex shaped, semi-porous, double membraned, permeable cell organelle found within the mesophyll of the plant cell.They are the sites for synthesis food by the process of photosynthesis. Read this lesson to … green leaf , red flower , …