Which of the following statements about plant defenses is CORRECT? A constitutive defense reduces the effect of herbivory on a plant's fitness An induced defense reduces the effect of herbivory on a plant's fitness Induced defenses change their expression in response to damage by a herbivore The expression of constitutive defenses fluctuates over time
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Step 1: Constitutive defenses are always present in the plant, regardless of herbivory. Show more…
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Chemical Defenses: What is the benefit of having an inducible chemical defense, as opposed to a constitutive chemical defense? (an inducible defense is when the chemical is produced when herbivory is taking place as opposed to a constitutive defense where the chemical is always present) a.) Inducible chemical defense best deters herbivory. b.) With inducible defense predation will take place before a defense compound is produced which means there is damage to the plant before a defense is employed. c.) With inducible defense herbivores are deterred even if no defense compound is produced. d.) With inducible defenses energy is conserved by only producing secondary compounds when needed instead of continually.
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Plants have various induced defenses that allow them to defend against pathogen and herbivore attacks. In addition, plants have permanent defenses (e.g. thorns, toxins), which are always present. Which of the following identifies a benefit of permanent defenses over induced defenses? Induced defenses are only effective at the site of the attack, while permanent defenses can protect the whole plant. Induced defenses take time to initiate while permanent defenses provide immediate protection. Permanent defenses are more specific while induced defenses are more general. Permanent defenses require less energy and resources to produce and maintain than induced defenses.
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Which of the following would be evidence of a trade-off in plant defense? A plant that is fighting a pathogen responds more vigorously when attacked by a herbivore When two plants exchange defensive chemicals via their root system A plant that is fighting a pathogen responds less vigorously when attacked by a herbivore When plants stop growing at maturity
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