Why are roots essential for terrestrial plants?
A. They allow plants to obtain sun energy.
B. Roots are not essential for plants, as plants can function without roots.
C. They absorb carbon dioxide needed for photosynthesis.
D. They absorb water and minerals needed for growth.
Answer: D
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Which one of the following represents the pH of a solution with the highest concentration of hydrogen ions?
A. 1.0 B. 4.5 C. 7.0 D. 9.1 E. 11.5
An individual who responds to walking into an obstruction by pushing into it harder is exhibiting
(a) negative phototaxis. (b) positive geotaxis. (c) negative thigmotaxis. (d) positive thigmotaxis.
Substances that are contained in vaccines to help induce a better immune response are called
A. primary substances. B. secondary substances. C. adjuvants. D. adjuncts.
The final body form of an animal is generated as differentiated cells settle into their appropriate sites; this process is
called ____.
a. fertilization b. morphogenesis c. parturition d. involution e. gastrulation