Q.
How many of the given structures are redifferentiated structures developed during secondary growth?
Interfascicular cambium, secondary xylem, secondary phloem, phellogen, cork, primary phloem, secondary cortex, complementary cells
Solution:
Plant growth are of two types (1) primary growth (2) secondary growth. In primary growth, length of plant part increases due to primary meristem. This activity achieved by the process differentiation. By differentiation, primary parmanent tissue are formed primary meristem. In older dicot plants, primary permanent tissue becomes meristematic and produce secondary meristem by the process dedifferentiation. Secondary parmanent tissue are formed by secondary meristem through the process redifferentiation. Redifferentiation process occurs in stelar region and extra stelar region.
Secondary meristem produce secondary permanent tissues by the process redifferentiation. In the given question, five types of tissues are formed through redifferentiation process i.e. secondary xylem, secondary phloem, cork (phellem), secondary cortex (phelloderm), and complementary cells. Redifferentiation process occurs during secondary growth in woody plant. In seconday growth girth of plant or plant part becomes increase.
Secondary meristem produce secondary permanent tissues by the process redifferentiation. In the given question, five types of tissues are formed through redifferentiation process i.e. secondary xylem, secondary phloem, cork (phellem), secondary cortex (phelloderm), and complementary cells. Redifferentiation process occurs during secondary growth in woody plant. In seconday growth girth of plant or plant part becomes increase.