Root hairs grow actively in which area of the developing roots?
A. root cap
B. zone of maturation
C. zone of elongation
D. zone of cell division
E. endodermis
B. zone of maturation
Root hairs are common only in the zone of maturation. Please read section 36.3 for more information on root development.
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Human damage to Earth’s ecosystem and biodiversity will likely decrease the planet’s human:
a. age structure. b. agricultural advancements. c. potential for technological innovation. d. carrying capacity.
What type of skeleton do earthworms have?
a. exoskeleton b. endoskeleton c. hydrostatic skeleton d. segmental skeleton e. none of these
A neurophysiologist is investigating nerve reflexes in two different animals: a crab and a fish. Action potentials are found to pass more rapidly along the fish's neurons. What is the most likely explanation?
A) The fish's axons are smaller in diameter; small axons transmit action potentials faster than large axons do. B) Unlike the crab, the fish's axons are wrapped in myelin. C) There are more ion channels in the axons of the crab compared with fish axons. D) Unlike the crab, the fish's axons are wrapped in myelin, and the fish's axons are smaller in diameter; small axons transmit action potentials faster than large axons do.
The basic conceptual approach to phylogenetic tree building involves the process of:
a. selecting information about character states. b. selecting taxa for inclusion in the tree. c. the logic that species with many character states in common are more closely related than those without. d. None of the above. e. All of the above.