Stem Modifications


 
 
Concept Explanation
 

Stem Modifications

Stem : The stem is the plant axis that bears shoots, leaves, buds and flowers. Stems get modified based on the requirements of the environment . It can modify to store food, to protect plant from animals  and for the storage of food etc. 

Stem Modifications:

  • Storage of food: In some plants, underground stem is modified to store food in the form of starch. Three types of underground modifications of stem are tubers (e.g. Potato), rhizome (e.g. Ginger) and bulb (e.g. Onion).
  • Protective structures: In some plants like rose, stems are modified into spines or thorns to protect the plant from being eaten by animals.
  • Supportive structures: In climbing plants, stems are modified into tendrils  which twine around the support.
  • Storage of water: In some plants like cactus and jade, stems become fleshy and succulent to store water. 
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                                                   Different modifications of stem

    Sample Questions
    (More Questions for each concept available in Login)
    Question : 1

    In plants of gourd and cucurbita, some thread like structures arise from the stem that helps the plants to climb. These structures are called ________________________

    Right Option : A
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    Question : 2

    Find the odd out

    Right Option : C
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    Question : 3

    Which of the following are correct :

    (a) The stem is the plant axis that bears shoots, leaves, buds and flowers.

    (b)  In some plants like rose, stems are modified into spines or thorns to protect the plant from being eaten by animals.

    (c)  In climbing plants, stems are modified into tendrils  which twine around the support.

    Right Option : D
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