Plants could readily develop seasonal responses for flowering based on temperature changes but have "elected" through evolution to manage their rhythms based on a comparison of daylight and darkness. Why has the day-night ratio system been selected?
A. Temperatures fluctuate widely across seasons and from year to year, but photoperiod comparisons are a more reliable indicator of season.
B. Temperature has no effect upon plant biochemistry.
C. Temperature is a gradation but day/night is all-or-nothing.
D. A plant's nervous system is tuned to light stimuli and not to temperature stimuli.
Answer: A
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In a long term study by the evolutionary biologists Endler and Reznick, they illustrated the effect of predation on life history traits by studying guppies with different predators: cichlids and killifish. The killifish preys mostly on immature, smaller guppies and cichlids pursue mature, larger guppies. They noticed that in river portions with only killifish, the guppies were larger than in
river portions with only cichlids. How did Endler and Reznick test whether these differences in life history traits were genetic? What will be an ideal response?
Which of the following flower parts does not produce female structures?
1.carpel 2.stamen 3.stigma 4.style
If it is suspected that a poison was administered orally, the ___ ___ should be analyzed first.
Fill in the blank(s) with the appropriate word(s).
What would be included under the umbrella of "inclusive fitness"? (Check all that apply.)
A. reproduction of the individual B. reproduction by nieces and nephews C. reproduction by siblings D. reproduction by unrelated colony members E. reproduction by an another individual that practices reciprocal altruism