NEET BIOLOGY

Detailed explanation-1: -It is found in the dicot stem, dicot roots, and gymnosperms. Herbs, shrubs, and hydrophytes do not show secondary growth.

Detailed explanation-2: -The secondary growth of plants increase in stem thickness and it is due to the activity of the lateral meristems, which are absent in herbs or herbaceous plants.

Detailed explanation-3: -The increase in stem thickness that results from secondary growth is due to the activity of the lateral meristems, which are lacking in herbaceous plants. Lateral meristems include the vascular cambium and, in woody plants, the cork cambium (see Figure 1).

Detailed explanation-4: -Herbaceous plant shoots grow in length and diameter in the same way that roots do: the apical meristem at the tip of the stem produces new cells and then those new cells enlarge in length and volume in the region of elongation just behind the meristem.