AP BIOLOGY

Detailed explanation-1: -The Vascular Cambium and Secondary Growth. The vascular cambium and cork cambium are secondary meristems that are formed in stems and roots after the tissues of the primary plant body have differentiated. The vascular cambium is responsible for increasing the diameter of stems and roots and for forming woody tissue.

Detailed explanation-2: -Complete answer: Option A: Plants’ secondary growth is controlled by the vascular cambium. It is a thin layer of cells that separates the xylem and phloem in plants. With the plant’s secondary growth, which increases its girth size, these cells divide and multiply.

Detailed explanation-3: -Primary growth is controlled by root apical meristems or shoot apical meristems, while secondary growth is controlled by the two lateral meristems, called the vascular cambium and the cork cambium.

Detailed explanation-4: -In many vascular plants, secondary growth is the result of the activity of the two lateral meristems, the cork cambium and vascular cambium. Arising from lateral meristems, secondary growth increases the width of the plant root or stem, rather than its length.