NEET BIOLOGY

Detailed explanation-1: -So, the correct answer is option (D) “Differential action of hormones”. Note: The hormones involved in the vascular cambium activity are auxins, ethylene, gibberellins, cytokinins, abscisic acid which are vital for the regulation of these activities.

Detailed explanation-2: -Cell division by the cambium produces cells that become secondary xylem and phloem. As secondary phloem and xylem tissue accumulates, it both increases the girth of the stem and forms wood and bark.

Detailed explanation-3: -There are two primary cell types in the vascular cambium. Fusiform initials are long cells that produce the cells that make up the cells responsible for vertical growth of the phloem and xylem, and ray initials are shorter, rectangular cells that provide cells for horizontal phloem and xylem growth.

Detailed explanation-4: -Assertion : During secondary growth, the amount of secondary xylem produced is more than secondary phloem and soon forms a compact mass. <br> Reason : The vascular cambium (cambial ring) is generally more active on the inner side than on the outer side.

Detailed explanation-5: -Tyloses. On the outside of a tree trunk, we typically see a layer of mostly dead cells that were produced by the vascular and cork cambiums. Scientists use the word to indicate all the tissues outside the cambium. Bark.