Question

Growth of leaf primordia is

• A. First apical then marginal
• B. Only apical
• C. Only marginal
• D. Lateral

Answer 1

The correct option is A First apical then marginal

Plants have two types of meristems; the apical meristem and the intercalary meristem. Leaves are derived from shoot apical meristem which swells to form undifferentiated leaf primordium which divides into two systems that develop leaf blades and leaf sheaths. The growth of leaf blades occurs due to cells division but is mainly from cell elongation. The flattened blade form is derived from the marginal meristem present at the margins of leaf axis. Meristem present at the sides and causes increase in girth of the plant is termed as lateral meristem and is not involved in leaf formation.
Thus, the correct answer is option A.