NEET BIOLOGY

Detailed explanation-1: -Vascular cambium is responsible for the secondary growth of xylem and phloem which are the vascular tissues. In the Dicot stem, a layer of cambial cells is seen in between the primary xylem and primary phloem.

Detailed explanation-2: -Secondary growth in the dicot stem involves the formation and functioning of the vascular cambium and cork cambium. Secondary growth provides the plants or trees with protection against mechanical stress and microbial activity. Secondary growth increases the girth of the stem.

Detailed explanation-3: -All the statements are correct regarding secondary growth in dicot stems. The vascular cambial ring develops as a circular ring since beginning. The vascular cambial ring is completed by both the primary (intrafascicular) strip and secondary (interfascicular) strip. The vascular rays are narrow since beginning.

Detailed explanation-4: -Gymnosperms show secondary growth. C. Periderm is a secondary tissue that helps in secondary growth.

Detailed explanation-5: -Secondary growth, or “wood”, is noticeable in woody plants; it occurs in some dicots, but occurs very rarely in monocots.