If you have a plant with white flowers that open at night and have a long, narrow floral tube, what kind of pollination agent would you suspect?
A. birds
B. bats
C. moths
D. butterflies
E. bees
C. moths
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A trait that is adaptive in one context and later turns out to have adaptive value in a different context is called ____
a. paedomorphic b. heterochronic c. allometric d. an exaptation e. endemic
The primary root of a seedling grows down
a. to avoid light. b. in response to gravity. c. because the cells on the upper surface of the root elongate more rapidly than those on the lower surface of the root. d. in response to different concentrations of auxin. e. because of all of these except "to avoid light."
How does brightfield microscopy allow images to be visualized?
A) Specimens are illuminated with white light. B) Electrons strike the specimen being examined. C) Specimens are fixed and have bright fluorescent molecules attached to them. D) Specimens are illuminated with blue light to visualize internal features of cells smaller than 100 nm. E) Specimens are viewed under phased light to improve magnification.
Clay in soils represents a trade-off in nutrient availability, such because
a. oxygen levels are exceptionally high, but much of the nitrogen leaches away b. nitrogen levels are exceptionally high, but much of the nitrogen leaches away c. cations are less likely to leach out of soil but are difficult for plants to extrac d. anions are less likely to leach out of soil but are difficult for plants to extract