TREE DISEASES AND PESTS
COMMON TREE DISEASES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Some plants have thorns-what type of defence mechanism is this?
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Physical
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Chemical
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Mechanical
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None of the above
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Explanation:
Detailed explanation-1: -Examples of mechanical defenses include thorns on the leaf or stem, bark on a tree, and trichomes or barbs on the leaf. In some instances, a plant will protect its seeds with a tough shell (think of a coconut, a jackfruit or a pineapple).
Detailed explanation-2: -Mechanical Defenses The first line of defense in plants is an intact and impenetrable barrier composed of bark and a waxy cuticle. Both protect plants against herbivores. Other adaptations against herbivores include hard shells, thorns (modified branches), and spines (modified leaves).
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