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- #Structural Organisation in Animals and Plants
An organ differentiated into nodes and internodes is the part of
Option: 1
Shoot system
Option: 2
Root system
Option: 3
Both a and b
Option: 4
None of these
Answers (1)
The Stem
- Stem is a major organ of the shoot system of plant body.
- It arises through the elongation of plumule of the embryo.
- Stem is negatively geotropic, negatively hydrotropic and positively phototropic.
- Stem differs from root because it shows a clear demarcation of nodes and internodes.
- Nodes are the regions of the stem where leaves are borne.
- Internode is the region between two nodes.
- Stem bears vegetative buds that are responsible for the growth of the plant.
- The apical bud adds to the height of the plant while the axillary bud allows the growth of lateral branches.
- Stem also bears floral buds.
- Young stem is generally green due to the presence of chlorophyll. Hence, young stem is photosynthetic.
- Older stem of trees becomes woody and dark brown.
-
Stem is differentiated into nodes and internodes.
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