As a seed germinates, its shoot points upward toward light, and its roots grow downward into the soil. Turn the plant sideways, and the stem and roots bend according to the new direction of gravity. How do roots and shoots grow in opposite directions as the plant is rotated?
A. The absorption of light by phytochromes only occurs in shoots.
B. The roots and shoots respond oppositely to auxin.
C. The circadian rhythms of roots and shoots are opposite.
D. Statoliths move in the opposite direction of roots and shoots.
E. through differences in thigmotropism
B. The roots and shoots respond oppositely to auxin.
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Which phylum exhibits both a teleomorph and an anamorph form?
a. Ascomycota b. Basidiomycota c. Deuteromycota d. Zygomycota
The human eye’s protective mucus membrane is the ____
a. retina b. sclera c. cornea d. conjunctiva e. aqueous humor
All living things, except bacteria and archaea, are eukaryotes
a. true b. false
The Red Queen hypothesis proposes the following relationship between taxon age and extinction:
A. Lineages become more resistant to extinction the longer they have been present. B. Rates of extinction vary substantially between different groups of organisms. C. Immediately after speciation, risk of extinction is very high, but it eventually levels out. D. Rate of extinction of taxa is fairly constant over time. E. Rates of extinction vary substantially between different groups of organisms, and lineages become more resistant to extinction the longer they have been present.