NEET BIOLOGY

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: -Apical meristem is the region at the tip of the plant body. It helps in the increase in the height of the plant. The girth of the stem and roots increases due to lateral meristem. It is present on both sides of stem and roots.

Detailed explanation-3: -Primary growth occurs at the apical meristem (a meristem located at the tip of a stem). A meristem is a region of undifferentiated cells from which new cells arise through cellular division. Secondary growth is an increase in thickness or girth of the plant body due to activity of lateral meristems.

Detailed explanation-4: -Primary growth is controlled by root apical meristems or shoot apical meristems, while secondary growth is controlled by the two lateral meristems, called the vascular cambium and the cork cambium. Not all plants exhibit secondary growth.

Detailed explanation-5: -Root apex and shoot apex are examples of the apical meristem.