MICROANATOMY

Detailed explanation-1: -Plastids are the largest cell organelle in plant cells containing DNA, their plasma membrane is double layer like mitochondria. Plastids store a variety of substance and are classified into three types, this classification was given by Haeckel:-Leucoplasts: These are the largest of all plastids, they are colorless.

Detailed explanation-2: -Leucoplasts (Fig. 1.9C) are a group of plastids that include many differentiated colorless organelles with very different functions (e.g., the amyloplasts), which act as a store for starch in non-green tissues such as roots, tubers, or seeds (Chapter 9).

Detailed explanation-3: -All plastids, including chloroplasts, develop from proplastids, small (0.5 to 1 m in diameter) undifferentiated organelles present in the rapidly dividing cells of plant roots and shoots.