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1	The "vampire weed" exhibits which type of species interaction with other plants?
	A)	commensalisms
	B)	mutualism
	C)	parasitism
	D)	all of the above
2	Based upon their research, if given the chance the "vampire weed" will preferentially grow towards:
	A)	a tomato plant
	B)	a weed
	C)	a wheat plant
	D)	it will grow towards any of these plants equally well
3	The "vampire weed" is detrimental to farmers because:
	A)	it steals valuable nutrients reducing the productivity of the crop plants
	B)	it becomes so entangled in the crop plant that it cannot be removed decreasing the value of the crop plant
	C)	it secretes a toxic compound into the crop plant that cannot be removed
	D)	a and b
	E)	all of the above
4	Based upon their research, the "vampire weed" appears to seek out its host by following:
	A)	a temperature gradient
	B)	a chemical signal
	C)	a color-based visual stimulus
	D)	none of the above