Spines are modified as a defense mechanism in some plants.

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Multiple Choice

Spines are modified as a defense mechanism in some plants.

Explanation:
Spines are sharp outgrowths that are often modified leaves or leaf bases, and their main role is protection against herbivores. This makes them a direct example of a structural modification used for defense. Tendrils are for climbing, not defense. Calyx is a floral part that protects the bud, and endosperm is the nutrient tissue inside seeds, not a defensive adaptation. So the spine modification best fits the statement about defense.

Spines are sharp outgrowths that are often modified leaves or leaf bases, and their main role is protection against herbivores. This makes them a direct example of a structural modification used for defense. Tendrils are for climbing, not defense. Calyx is a floral part that protects the bud, and endosperm is the nutrient tissue inside seeds, not a defensive adaptation. So the spine modification best fits the statement about defense.

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