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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
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