AP BIOLOGY

Detailed explanation-1: -The length of the plant is increased by the primary meristems present from the early life of the plant. Apical meristems that are present at the tip of the shoot and sub-terminal region of root mainly helps in the increase in the length of the plant by adding more cells as they show periclinal division.

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: -The Shoot Apical Meristem (SAM) gives rise to organs like the leaves and flowers, while the Root Apical Meristem (RAM) provides cells for future root growth.

Detailed explanation-4: -Reason: Apical and intercalary meristems always increase the height of the plants.

Detailed explanation-5: -The key to plant growth is meristem, a type of plant tissue consisting of undifferentiated cells that can continue to divide and differentiate. Meristem allows plant stems and roots to grow longer (primary growth) and wider (secondary growth).