Question

A particular species of plant is able to defend itself against a species of caterpillar by producing nicotine, a nitrogen-containing alkaloid. What is TRUE about this system?

	a.	Although effective for a few specialist herbivores, alkaloids are harmless for most generalist animal herbivores.
	b.	If this caterpillar species evolves resistance to nicotine, there are no other possible options for the plant to protect itself and so this species will certainly go extinct.
	c.	Nitrogen is only used by plants for producing alkaloids.
	d.	Alkaloids are "expensive" for a plant to produce because they contain nitrogen, which is a limiting nutrient for plants.
	e.	The fitness of this plant will always be higher if it produces a larger amount of alkaloids rather than a smaller amount.

Answer 1

Ans: If this caterpillar species evolve resistance to nicotine, there are no other possible options for the plant to protect itself and so this species will certainly go extinct.( Reason-Resistance to a drug is something very common any species does to adapt itself to any condition and to survive in the process of evolution.If the caterillar has to survive then the only way is get resistant to the nicotine.)

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