AP BIOLOGY

Detailed explanation-1: -The layer of tissue present in the stems and roots of plants that help in plant growth is called as the cambium. These actively dividing cells forms a layer between xylem and phloem tissues and is responsible for the secondary growth, which results in the increase in girth of the tree.

Detailed explanation-2: -Lateral meristems include the meristematic tissues that occupy the lateral regions of stems and roots. They bring about increase in the width of the plant body.

Detailed explanation-3: -cambium, plural Cambiums, orCambia, in plants, layer of actively dividing cells between xylem (wood) and phloem (bast) tissues that is responsible for the secondary growth of stems and roots (secondary growth occurs after the first season and results in increase in thickness).

Detailed explanation-4: -During secondary growth, the medullary rays adjacent to the intrafascicular cambium develop into meristematic tissue and are called interfascicular cambium. Both intrafascicular and interfascicular cambiums form a continuous ring called a cambial ring.