AP BIOLOGY

Detailed explanation-1: -Primary growth in plants is initiated by the apical meristem and helps the plant to grow upwards.

Detailed explanation-2: -Whereas primary tissues allow for vertical growth, secondary tissues allow for lateral growth: they allow stems and roots to become wider.

Detailed explanation-3: -Stems grow vertically and, similarly to roots, they have meristematic tissue on their tips, where cells are constantly dividing through mitosis, allowing the stem to elongate.

Detailed explanation-4: -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-5: -Primary growth is the first phase of growth experienced in all plants. The definition of primary growth is the rapid dividing of cells, primarily in the apical meristems of plants, located at the tips of roots and stems.