Explain why a food web gives a better picture of a community than does a food chain
What will be an ideal response?
A food web portrays the interactions among organisms in which many organisms eat from more than one level.
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In the experiment involving bluegill sunfish and their choice of diet, when equal numbers of small,
medium, and large Daphnia are present,
a. the sunfish prefer small Daphnia. b. the sunfish prefer medium Daphnia. c. the sunfish prefer large Daphnia. d. the sunfish show no preference. e. sunfish do not consume Daphnia.
If you expose a plant to a light that shines on the right side of a plant, which of the following best
describes why the plant grows toward the light? a. Light destroys auxin, and thus the shaded side grows faster. b. Auxin moves from the shaded side to the lighted side where it stimulates growth. c. Auxin moves from the lighted side to the shaded side where it stimulates growth. d. Light destroys auxin and thus the lighted side grows faster. e. Auxin moves from the shaded side to the lighted side where it inhibits growth.
About how long have modern humans existed?
A) 25,000 years B) 250,000 years C) 2,500,000 years D) 25,000,000 years
Scientists studying a group of related bird species on an island archipelago discover that these species are always more closely related to each other within an island than they are between any two islands. The most likely explanation for this result is that
A. many ancestral bird species colonized each island. B. each bird species became reproductively isolated by living on a different island, then later colonized the other islands and acquired new adaptations. C. each bird species evolved different adaptations in allopatry and then colonized the other islands. D. one bird species colonized each island and then evolved into distinct species on that island through character displacement.