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  • Help me please, In Bougainvillea thorns are the modifications of (1):

In Bougainvillea thorns are the modifications of (1):

  • Option 1)

    Stipules

  • Option 2)

    Adventitious root

  • Option 3)

    Stem

  • Option 4)

    Leaf

 

Answers (1)

As discussed in

Types of special stem modifications -

Phyllacodes - Flat, fleshy, green leaf like structure which has a succession of nodes and internodes at long and short intervals. Leaves are modified into spine or scale to check transpiration. Photosynthesis takes place in phyllacodes. Ex: Opuntia, cereus, Euphorbia

Cladode - Phylloclade with one internode is called cladode. Ex: Aspargus & Ruscus

Thorn - Modification of axillary bud or terminal bud of the stem. It may bear leaves, flowers & Endogenous in origin. Ex: Catissa (Karonda), pomegranate, citrus, Bougainvillae

Tendrils - Helps the plant to climb, When it comes in contact with the neighbouring object it coils round it. It is modification of axillary bud and exogenous in origin. Ex: Grapes, cucumber, pumkins, watermelon etc

-

 

 Thorns are modified stems 


Option 1)

Stipules

This solution is incorrect 

Option 2)

Adventitious root

This solution is incorrect 

Option 3)

Stem

This solution is correct 

Option 4)

Leaf

This solution is incorrect 

Posted by

Vakul

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