Which of the following is not a stem modification?

  • Option 1)

    Pitcher of Nepenthes

  • Option 2)

    Thorns of citrus

  • Option 3)

    Tendrils of cucumber

  • Option 4)

    Flattened structures of Opuntia

 

Answers (2)

As learnt

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

-

 

 Pitcher of Nepenthes is not stem modification


Option 1)

Pitcher of Nepenthes

This option is correct

Option 2)

Thorns of citrus

This option is incorrect

Option 3)

Tendrils of cucumber

This option is incorrect

Option 4)

Flattened structures of Opuntia

This option is incorrect

Picher of nepenthes

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