AP BIOLOGY

Detailed explanation-1: -So, the correct answer is ‘Development of cambium in stele and in the cortical region’

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: -So, the correct option is ‘Secondary xylem is cut off more in quantity towards outer side’

Detailed explanation-4: -In a dicot stem, secondary growth occurs both in the stele and cortex. The process occurs simultaneously but is caused by separate strips of secondary meristem. In the stele, secondary growth is initiated by vascular cambium, while in the cortex, it is initiated by cork cambium.

Detailed explanation-5: -Gymnosperms show secondary growth. C. Periderm is a secondary tissue that helps in secondary growth.