Biology · Anatomy of Flowering Plants · NEET
It is a tissue made of young cells that can divide again and again. Because these cells never lose the power to divide, the plant can keep growing in length and in width. Growth in plants happens only at these small regions, not all over the body.
They are small and roughly equal in size (isodiametric), have thin walls made of cellulose, and are packed close with no gaps between them. Inside, they have dense cytoplasm (protoplasm), a large central nucleus, and very few or no vacuoles. NEET often tests these four features together.
A large vacuole would fill the cell with water and stop it from dividing quickly. Meristematic cells keep their cytoplasm dense so they are always ready to divide. When these cells later stop dividing and become permanent tissue, big vacuoles then appear.
They are always living. Dead cells cannot divide. This is why sclerenchyma (dead cells) is NOT meristematic. In NEET, remember: any cell that is dividing must be living.
Meristematic tissue keeps dividing; permanent tissue has lost the power to divide. Meristematic cells are small with thin walls, dense cytoplasm and no vacuole. Permanent cells are larger, may have thick walls and big vacuoles, and do a fixed job. Permanent tissue is formed FROM meristematic tissue.
By dividing, meristematic cells produce new cells. Some new cells stay meristematic; the rest grow, change shape, and turn into permanent tissue (parenchyma, collenchyma, sclerenchyma, xylem, phloem). This change is called differentiation.
Match List-I with List-II. List-I: (a) Cells with active cell division capacity (b) Tissue having all cells similar in structure and function (c) Tissue having different type of cells (d) Dead cells with highly thickened walls and narrow lumen. List-II: (i) Vascular Tissues (ii) Meristematic tissues (iii) Sclereids (iv) Simple Tissue
Try the real previous-year questions from this chapter — each with the answer and a full solution.
At the tips of roots and shoots (apical meristem), at the base of leaves and internodes in grasses (intercalary meristem), and along the sides of roots and stems (lateral meristem). These are the only places where cell division for growth happens.
No. Apical meristem is just one TYPE of meristematic tissue, found at root and shoot tips. Meristematic tissue is the general term that also includes intercalary and lateral meristems.
No. Meristematic cells are packed tightly together with no gaps (no intercellular spaces). This is one of their key NEET features, unlike parenchyma which often has spaces.
It is the starting point of the whole 'Anatomy of Flowering Plants' chapter. Understanding it makes apical/intercalary/lateral meristems, secondary growth, and permanent tissues easy. NEET asks direct 'features' and 'match the column' questions from it almost every year.