Chemicals that release energy when struck by light are called ____
a. photo-optics
b. photopigments
c. opsins
d. kestrels
b
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Which of the following is an evolutionary explanation for the development of motion sickness?
a. Poisons disturb the vestibular and vision systems, resulting in nausea and vomiting to expel the poison; therefore, we react to sensory conflict of these system by vomiting. b. When humans evolved, the vestibular senses became less important, thereby degenerating. c. The brain developed an increased capacity for thought, thereby taking over some of the cortex previously used for perception of motion. d. Man evolved on land and has not developed a complex three-dimensional sense of motion that sea-born creatures have.
Fewer negative effects of adolescent employment are observed for students working as lifeguards or office clerks than students working in food services. One possible explanation is that the first category of jobs
a. provide opportunities to learn useful skills that transfer to future jobs. b. allow students less flexibility in their hours forcing them to become more self-disciplined. c. pay better, which leads to a higher sense of self-esteem. d. interfere with students’ social activities, which allows them to focus on homework in school.
How many of the 6 to 14 month old infants tested by Walk and Gibson refused to crawl over the deep side of the visual cliff to their mothers?
a. 25% of them b. none of them c. all of them d. 75% of them
When a researcher can be confident that experimental effects are actually caused by the independent variables and not some other uncontrolled factors, we say the experiment is high in
a. internal validity b. random assignment c. external validity d. real-world applicability