LIFE SCIENCE

Detailed explanation-1: -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).

Detailed explanation-2: -Meristems are the regions of cells that are capable of growth and undergo rapid cell division, which is when cells make more cells through a process known as mitosis. Apical meristems, which control the lengthening of roots and stems, are responsible for the majority of primary growth.

Detailed explanation-3: -Primary growth in plants is initiated by the apical meristem and helps the plant to grow upwards.

Detailed explanation-4: -There are three phases of growth – meristematic, elongation and maturation.