In midlatitude regions, photosynthesis continues in most plants even on overcast days.
a. true
b. false
Ans: a. true
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A woman has a large garden and decides this year she will not let the pests get beyond control. At the earliest sign of insect pests, she applies an organic insecticide and continues to apply it every month throughout the growing season
The next year the woman decides not to use any insecticides, thinking that she must have eliminated the pests with the prior year's treatments. Unfortunately, the pests reappear in numbers greater than she has ever seen before, and her crops are destroyed. Investigating this phenomenon, she learns that she has just experienced a phenomenon known as A) resurgence. B) pesticide resistance. C) natural selection. D) emergence.
In addition to glaciers melting and the oceans acidifying, what other indicators are there of climate change?
A. Birds in the northern hemisphere have expanded their ranges northward. B. Birds in the southern hemisphere have expanded their ranges northward. C. Plants have expanded their range down mountain slopes. D. Bees have expanded their range in the direction of the equator.
Which of the following processes occurs during baroclinic instability?
A. reduction of wave cyclones B. no air motion C. weak wind speed shear from the surface up to at least the 500 hPa level D. temperature advection
Which of the following is true of thymine and uracil?
A) Both have a methyl group at C-5 B) Thymine has a methyl group at C-5 but uracil does not. C) Uracil has a methyl group at C-5 but thymine does not. D) Neither has a methyl group at C-5.