Meristematic tissue consists of cells that can divide. There are three types of primary meristems based on their position in a plant: (a) Apical meristem- This meristem is present at the tip of the shoot, root, and branches. They have the power to increase the length of the plant. Some cells of apical meristem are left behind to produce an axillary bud present at the axil of the leaf. This bud can form shoot either vegetative or reproductive but is usually remains dormant because of plant hormone effect. Apical bud is located at the top of the stem. It is the primary growth point in the plant. (b) Intercalary meristem- It derived from the apical primary meristem which is left behind and present between two mature tissue. This tissue helps in increasing the length of the plants. They are mostly present at the internode of the plants in certain monocotyledons and help these plants to regrow their stems when grazed by herbivorous. Intercalary meristem is different from other types of meristem in that it gets completely used in the formation of permanent tissues. (c) Lateral meristem- It is present at the side of the plants. It is participating in secondary growth. Only one type of primary lateral meristem present in plants. It is Intrafascicular cambium. It is present in vascular bundles.
