A study finds a positive correlation between the number of spots on the tail of male peacocks and their mating success. What would be the best followup experiment?
A. Inject testosterone and observe changes in spot count.
B. Remove spots or add artificial spots to male tails and determine female responses.
C. Measure the sperm count of males and compare to spot count.
D. Count the number of spots on female tails and measure mating success.
Answer: B
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Boiling water before drinking can prevent which types of pathogens from harming the body?
A. Viruses B. Fungi C. Bacteria D. Protists E. All of the answers are correct.
A large watermelon fruit is very heavy and contains nearly 90% water. Since the skin of a watermelon is thick and lacks stomata, transpiration does not "pull" water into the watermelon. So, how does all that water get into the fruit?
A. Water enters by osmosis from the soil. B. Water is transported in the phloem along with the sugars while they are being translocated into the fruit. C. Root pressure pushes water into the watermelon. D. Water is pumped in by active transport. E. Watermelons, like other fruit, contain an abundance of xylem.
Which of the following is an increase in blood flow?
a. Ischemia b. Hyperemia c. Septicemia d. Leukocytosis
The conversion of physical or chemical stimuli into nerve impulses is known as:
A. sensory transduction B. sensory reception C. motor response D. cellular response