Answer :
The feature is a structural plant defense is cactus spines.
lant structural traits such as leaf surface wax, thorns or trichomes, and cell wall thickness and lignification
Which feature is a structural plant Defence?
Plant structural traits such as leaf surface wax, thorns or trichomes, and cell wall thickness and lignification form the first physical barrier to feeding by the herbivores, and the secondary metabolites such act as toxins and also affect growth, development.
Thus, option "B" is correct.
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