What are the functions of spine in flower?

Dear Student
Please find below the solution to the asked query

Flowers do not possess spines. 
Spines are the modified leaves of some plants like Cactus. They prevent water loss and protect plant from grazing animals.

However, in some flowering plants thorns are present which protect plants and flowers from grazing animals.

Hope this information will clear your doubts about the topic.
 
 
Regards

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