As a seed germinates, its shoot points upward toward light, and its roots grow downward into the soil. Turn the plant sideways, and the stem and roots bend according to the new direction of gravity. How do roots respond to gravity?
A. through thigmotropism
B. by the absorption of light by phytochromes
C. by sensing the photoperiod
D. by the movement of statoliths within the cell
E. through circadian rhythms
D. by the movement of statoliths within the cell
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In muscle and liver tissue, glucose consumed in the diet but not immediately used is stored as ____
Fill in the blank with the appropriate word.
An examination of the arrangement of bones in the hand is an example of a(n) ____
a. ecological study b. taxonomic study c. anatomical study d. physiological study e. homeostatic study
In pedigrees, a male individual is symbolized as a ____________________. Fill in the blank(s) with the appropriate word(s)
Two populations of organisms belong to the same biological species when they
A) cannot mate with each other because mating occurs at different times. B) use different types of behaviors or physical features to attract mates. C) have anatomical features that make it difficult for organisms from the two populations to mate with one another. D) encounter each other, mate, and produce viable, fertile offspring under natural conditions.