Which of the following choices is an example of a plant exhibiting a circadian rhythm?
a. Leaves fold tightly in response to wind
b. Leaves of bean plants move to "sleep" positions at night.
c. Toxic compounds released in response to pathogen invasion kill some of the plant's own cells.
d. Deciduous trees lose leaves in autumn.
b
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The term angiosperm refers to
A. the narrow sperm of angiosperms. B. the enclosure of the seed within a fruit. C. the presence of endosperm. D. the branching of vascular veins. E. the presence of pollen.
Spinal reflexes do not involve
a. afferent nerves. b. efferent nerves. c. interneurons. d. the spinal cord. e. the brain.
Shared homologous structures would indicate that two taxa are:a
outgroups. b. monophyletic. c. polyphyletic. d. homoplastic. e. in different clades.
Of these fossil species, which one is thought most likely the ancestor of later species of Homo?
A. Homo ergaster B. Homo habilis C. Homo rudolfensis D. Homo sapiens