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Home Q & A Board Biology-Related Homework Help Environmental and Conservation Biology
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colleen colleen
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12 years ago
Having induced, rather than constitutive, plant defences seems like a very cost-effective mechanism to protect oneself against attack. However, many plant species contain constitutive defences. Why?
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Sunshine ☀ ☼

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#1
12 years ago
The production of chemical defences require energy, and it is likely that inducing this production, and halting it, also requires an energetic investment. Plants with constitutive defences may be attacked at such high rates that it is more efficient to maintain defensive pathways at all times than to switch them on and off. Alternatively, induced defences may take time to initiate – if herbivory is intense, plants may die before their defences can be activated.
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