Q. Chloroplast dimorphism is a characteristic feature of :

Q. Chloroplast dimorphism is a characteristic feature of :

1. Plants with Calvin cycle
2. C₄ plants
3. All plants
4. Only in algae.

Solution:

Correct option: B Dimorphic chloroplasts are the chloroplasts which are concentrated into two types of cells having different size and structure. The dimorphic chloroplast is present in C₄ plants because of the presence of special leaf anatomy called Kranz anatomy. They have two types of cells i.e., mesophyll cells and bundle sheath cells, which are required for C₄ pathway. The particularly large cells around the vascular bundles of C₄ plants are called bundle sheath cells, these cells may form several layers around the vascular bundles, they are characterised by having a large number of dimorphic chloroplasts, grana are absent, thick walls impervious to gaseous exchange and no intercellular spaces. Mesophyll cells have dimorphic chloroplast having grana. Chloroplast dimorphism is characteristic feature of C₄ plants, e.g. Amaranthus, Sugarcane, Maize, etc.