(a) Chromoplast

• Chromoplasts are plastids and contain carotenoids.
• They lack in chlorophyll.
• Chromoplasts may develop from green chloroplasts. Chlorophyll and thylakoid membranes disappear and carotenoids are accumulated, e.g. during ripening of fruits.

Chloroplast

• Chromoplasts is a name given to an area for all the pigments to be kept and synthesized in the plant. 
• They have a high concentration of chlorophyll.
• Chloroplast has a structure called chlorophyll which functions by trapping the solar energy and used for the synthesis of food in all green plants.

(b) Ribosome

• Helps in protein synthesis.
• Found in both plants and animals.
• Ribosomes are scattered everywhere inside the cell.

Centrosome

• Plays major role in cell division.
• Found in only plants.
• Centrosome found inside nucleus only.