HORTICULTURE

Detailed explanation-1: -Primary growth is a result of rapidly-dividing cells in the apical meristems at the shoot tip and root tip. Subsequent cell elongation also contributes to primary growth. The growth of shoots and roots during primary growth enables plants to continuously seek water (roots) or sunlight (shoots).

Detailed explanation-2: -A: A plant grows new tissue from an apical meristem. The apical meristem is a group of cells that retain the ability to continue divisions, forming new cells continuously as the plant grows. This PRIMARY growth is responsible for growth in height.

Detailed explanation-3: -Primary growth in plants is due to apical meristems (root and shoot apical meristems)

Detailed explanation-4: -The products of the root’s primary meristems become root tissues. The products of the three primary meristems (the protoderm, ground meristem, and procambium) are the tissue systems of the mature root: the epidermis (dermal tissue), cortex (ground tissue), and stele (vascular tissue) (FIGURE 24.8B).