Australopithecines often died of:
A. Old age
B. Starvation
C. Predation
D. Cannibalism
E. Infectious disease
Answer: C. Predation
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Angiosperms have a much higher water-transport capacity than that found in tracheid-only plants because:
A. the thinness of tracheids in angiosperms enhances their transport capability. B. the thin leaves of angiosperms allow them to transpire at a greater rate, moving more water. C. the specialization of cells into vessel elements and fibers allows transport and support to become separate functions. D. xylem in angiosperms is composed of living cells. E. the thin diameter of angiosperm vessels increases the rate of water flow.
____ are responsible for separating
chromosomes during cell division.
a. Microfilaments. b. Intermediate filaments. c. Actin filaments d. Microtubules e. Microfibers
Stomatal guard cells swell to create a stomata in response to ________.
A. The loss of Na+ and Cl- ions, allowing water to flow into the cells by osmosis B. The active transport of water into stomatal guard cells C. The outward flow of K+ ions, causing water to flow out of the cells by osmosis D. The inward flow of K+ ions, causing water to flow into the cells by osmosis E. Wilting in the leaf, which stimulates the uptake of water by stomatal guard cells
Chiasmata (or chiasma) provide evidence of
A) meiosis. B) chromosomal aberration. C) fertilization. D) spindle fiber formation. E) crossing over.