Which of the following comparisons between the moss life cycle and fern life cycle are valid?
_____ Mosses have flagellated sperm that need water the reach the female gamete, while the sperm of ferns are unflagellated and are not dependent on water.
_____ The sporophyte generation is smaller than the gametophyte generation in mosses, but the sporophyte generation is much larger than the gametophyte generation in ferns.
_____ The spores are produced in capsules on stalks in mosses but in small structures called sori on the underside of leaves in ferns.
_____ The gametes are produced in gametangia in mosses but in specialized structures on the underside of leaves in ferns.
_____ Both kinds of plants depend on wind for dispersal of spores.
_____ Mosses have flagellated sperm that need water the reach the female gamete, while the sperm of ferns are unflagellated and are not dependent on water.
__X__ The sporophyte generation is smaller than the gametophyte generation in mosses, but the sporophyte generation is much larger than the gametophyte generation in ferns.
_____ The spores are produced in capsules on stalks in mosses but in small structures called sori on the underside of leaves in ferns.
_____ The gametes are produced in gametangia in mosses but in specialized structures on the underside of leaves in ferns.
__X__ Both kinds of plants depend on wind for dispersal of spores.
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Which of the following statements best defines cavitation?
A. Cavitation is the presence of air bubbles in the xylem. B. Cavitation is the presence of sugars in the xylem. C. Cavitation describes the process of xylem vessel collapse. D. Cavitation is the presence of ice in the xylem. E. Cavitation is the presence of pressure in the xylem.
A population grows as long as its ____
a. total fertility rate exceeds the replacement fertility rate b. replacement fertility rate exceeds the total fertility rate c. total fertility rate equals the replacement rate d. total fertility rate is at least twice the replacement fertility rate e. total fertility rate falls below the average replacement fertility rate
When Stanley Miller applied heat and electrical sparks to a mixture of simple inorganic compounds such as methane, hydrogen gas, ammonia, and water vapor, what compounds were produced?
A) only simple organic compounds such as formaldehyde and cyanide B) mostly hydrocarbons C) only simple inorganic compounds D) simple organic compounds, amino acids, and hydrocarbons
In the accompanying figure, fertilization occurs within which of the labeled structures?
a. 1 b. 2 c. 4 d. 7 e. 8