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  •  Which of the following part of the plant is positively phototropic? Option: 1  Young stem 

 Which of the following part of the plant is positively phototropic? 

Option: 1

 Young stem 


Option: 2

 Old stem 


Option: 3

 Both a and b 


Option: 4

 None of these 


Answers (1)

best_answer

 

 

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 positively phototropic. 

Posted by

Kuldeep Maurya

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