What does the term carrying capacity mean?
a. the minimum number of offspring necessary to maintain the gene pool
b. logistic growth in a particular population
c. the maximum population an environment can support
d. birth rate minus death rate
c. the maximum population an environment can support
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Water flows into the source end of a sieve tube because _____
A) sucrose has diffused into the sieve tube, making it hypotonic B) sucrose has been actively transported into the sieve tube, making it hypertonic C) water pressure outside the sieve tube forces in water D) the companion cell of a sieve tube actively pumps in water E) sucrose has been transported out of the sieve tube by active transport
During inspiration (a.k.a. inhalation) of air into the lung of a mammal
A. the intercostal muscles relax. B. the chest cavity has a positive pressure. C. the diaphragm contracts. D. the diaphragm moves upward. E. the rib cage moves down.
In a hypothetical environment, fishes called pike-cichlids are visual predators of large, adult algae-eating fish (in other words, they locate their prey by sight). The population of algae-eaters experiences predatory pressure from pike-cichlids
Which of the following is least likely to result in the algae-eater population in future generations? A) selection for drab coloration of the algae-eaters B) selection for nocturnal algae-eaters (active only at night) C) selection for larger female algae-eaters, bearing broods composed of more, and larger, young D) selection for algae-eaters that become sexually mature at smaller overall body sizes
The kidneys help regulate blood pressure
Indicate whether the statement is true or false