You observe a sunflower that moves its leaves so that it tracks the sun across the sky through the day, and a sensitive
plant that reversibly folds up its leaflets when you touch it. These are both examples of ____.
a. phototropism
b. thigmotropism
c. stress responses
d. circadian rhythms
e. nastic movements
ANSWER: e
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Ecology is a science that can be carried out by ________.
A. learning by observing B. running experiments to test hypotheses C. both learning by observing and running experiments to test hypotheses D. neither participating in a march to demand actions on climate change
Carbohydrates have which one of the following characteristics?
A) They are composed of carbon, hydrogen, nitrogen, and oxygen. B) They release energy when their peptide bonds are broken. C) They are indigestible by most organisms. D) They contain carbon, hydrogen, and oxygen in a ratio of 1-2-1. E) They are able to store and transmit genetic information.
Field observation suggests that populations of a particular species of herbivorous mammal undergo cyclic fluctuations in density at three- to five-year intervals. Which of the following represent (a) plausible explanation(s) of these cycles?
A) Periodic crowding affects the endocrine system, resulting in increased aggressiveness. B) Increases in population density lead to increased rates of predation. C) Increases in rates of herbivory lead to changes in the nutritive value of plants used as food. D) Increases in population density lead to more proximal infestations of parasites to host animals. E) All of the above are plausible explanations of population cycling.
In the sexual selection simulation you looked at what happens if some organisms can evolve preferences for some traits, even when those traits have no intrinsic effect on the fitness of the organisms. What happened to the size of the organisms over time when you set the LEK-SIZE to 2 or even as high as 10 (really intense sexual selection)?
A. It remained unchanged B. It increased rapidly C. lt decreased rapidly