C 3 plants are more efficient at conversion of sunlight to plant matter than C4 plants
What will be an ideal response?
The reverse is true. At high light levels, C4 plants are more efficient. Also, they are
more efficient users of water (corn [Zea mays], for example, is a C4 plant). Efforts are
under way to increase plant efficiency from multiple approaches for both types of plant, but
especially for C3 food crops.
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A lunar eclipse that occurs when the Moon moves completely into Earth's umbral shadow is called a _____
A) total solar eclipse B) penumbral lunar eclipse C) partial solar eclipse D) total lunar eclipse
A 1.0 kg flashlight falls to the floor. At the point during its fall when it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How fast is it moving?
A) 3.7 m/s B) 6.9 m/s C) 14 m/s D) 45 m/s E) 9.8 m/s
A 16 solar mass main sequence star is at a smaller distance than a 1solar mass mainsequence star. Which star appears brighter?
a) cannot tell with the information given b) stars are approximately the same brightness c) the 16 solar mass main sequence star d) depends on the phase of the Moon e) the 1 solar mass main sequence star
Younger stars have more heavy elements because
a. old stars destroy heavy elements as they age. b. young stars burn their nuclear fuels faster. c. the heavy elements were made in previous generations of stars. d. heavy elements haven't had time to settle to the core of these younger stars. e. all of these