| Question 1: Some modern species of domesticated ________ actually originated as weeds in cultivated fields and have been bred by people into garden plants for their flowers or foliage. | |||
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| Question 2: An example is the corncockle, Agrostemma, which was a common field weed exported from ________ along with wheat, but now sometimes grown as a garden plant. | |||
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| Question 3: These so-called "beneficial weeds" may have other beneficial effects, such as drawing away the attacks of crop-destroying ________, but often are breeding grounds for insects and pathogens that attack other plants. | |||
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| Question 4: Some have been classified as noxious weeds by governmental authorities because if left unchecked, they often dominate the environment where crop plants are to be grown or cause harm to ________. | |||
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| Question 5: ________ is common weed over much of the world, and is sometimes used to make soup and other medicine in East Asia. | |||
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| Question 6: Naturally occurring disturbed environments include ________ and other windswept areas with shifting soils, alluvial flood plains, river banks and deltas, and areas that are often burned. | |||
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| Question 7: Perennial weeds often have underground stems that spread out under the soil surface or, like ground ivy (________), have creeping stems that root and spread out over the ground. | |||
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| Question 8: (See ________.) Not all weeds have the same ability to damage crops and horticultural plants or cause harm to animals. | |||
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| Question 9: Weeds may be unwanted for a number of reasons: they might be unsightly, or crowd out or restrict light to more desirable plants or use limited ________ from the soil. | |||
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| Question 10: Weedy plants generally share similar ________ that give them advantages and allow them to proliferate in disturbed environments whose soil or natural vegetative cover has been damaged. | |||
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