In seed-bearing plants, what structure becomes the seed following fertilization?
A. The microsporangium.
B. The pollen grain.
C. The ovule.
D. The endosperm.
E. The sporophyte.
C. The ovule.
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If you placed a red blood cell in a hypotonic solution, you would predict that its volume would ____ while the solute concentration in its cytoplasm would _____.
A. increase, increase B. increase, decrease C. decrease, increase D. decrease, decrease E. decrease, not change
Fleshy fruits, such as blueberries, usually aid seed dispersal by
a. catching in the hair or feathers of animals. b. being buried by animals. c. falling directly under the parent plant. d. floating away from the parent plant. e. being eaten by animals.
One species of fish feeds in the muddy bottom of a lake. A second species eats insects that land on the water surface. This is an example of
A) mechanical incompatibility. B) behavioral isolation. C) ecological isolation. D) geographic isolation. E) temporal isolation.
Which of the following will increase the speed of an action potential moving down an axon? I) Action potentials move faster in larger diameter axons. II) Action potentials move faster in axons lacking potassium ion channels
III) Action potentials move faster in myelinated axons. A) only I and II B) only II and III C) only I and III D) I, II, and III