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The length of different internodes in a culm of sugarcane is variable because of:
A
size of leaf lamina at the node below each internode
B
intercalary meristem
C
shoot apical meristem
D
position of axillary buds
Detailed Solution
The jointed stem of grasses such as sugarcane, with solid nodes and distinct internodes, is called a culm.
Intercalary meristem is the meristem that occurs between mature tissues. In grasses it is present at the base of the internodes (just above the nodes).
It is a part of the apical meristem that gets left behind during growth, and it adds to the length of the organ.
Each internode of sugarcane elongates by the activity of its own intercalary meristem.
Since the activity of this meristem differs from one internode to another, the internodes are of different lengths.
The shoot apical meristem is present only at the tip of the stem, and leaf size or the position of axillary buds does not decide the length of an internode.
Intercalary meristem is the meristem that occurs between mature tissues. In grasses it is present at the base of the internodes (just above the nodes).
It is a part of the apical meristem that gets left behind during growth, and it adds to the length of the organ.
Each internode of sugarcane elongates by the activity of its own intercalary meristem.
Since the activity of this meristem differs from one internode to another, the internodes are of different lengths.
The shoot apical meristem is present only at the tip of the stem, and leaf size or the position of axillary buds does not decide the length of an internode.