AP BIOLOGY

Detailed explanation-1: -The increase in length of the shoot and the root is referred to as primary growth. It is the result of cell division in the shoot apical meristem. Secondary growth is characterized by an increase in thickness or girth of the plant. It is caused by cell division in the lateral meristem.

Detailed explanation-2: -All plants experience primary growth, which is the lengthening of both roots and stems. This growth occurs because of cell division in apical meristems, which may continue indefinitely in plants.

Detailed explanation-3: -The primary growth in roots takes place in three main stages that include cell division, elongation, and differentiation. The primary growth in shoots occurs in the apical regions. This results in leaf primordia that are found in the older regions at the tip of plants.

Detailed explanation-4: -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-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).