Anatomy Of Flowering Plants Question 64
Question: Leaf primordium grows into adult lamina by means of:
Options:
A) Marginal meristem
B) Lateral meristem
C) First apical and then marginal meristems
D) Apical meristem
Show Answer
Answer:
Correct Answer: C
Solution:
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.
Growth of leaf blades occurs due to cells division but is mainly from cell elongation.
Thus, the growth of leaf is first restricted to apex of primordium and but is shortlived and is followed by intercalary growth which in turn causes growth of leaf length.
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 plant is termed as lateral meristem and is not involved in leaf formation.
BETA
