The first panel of the sequence in the accompanying figure reflects:
a. trial-and-error.
b. negative reinforcement.
c. an irrelevant stimulus.
d. the conditioned response.
e. the unconditioned response.
e
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Map units correspond to fixed physical distances
Indicate whether the statement is true or false
The root apical meristem is surrounded and protected by a structure called the
a. endodermis. b. root cap. c. quiescent center. d. pericycle. e. root hairs.
The flowering plants and gymnosperms differ from other plants by ____
a. possession of vascular tissue b. presence of nonmotile gametes c. presence of two types of spores d. dominance by the diploid generation e. production of seeds
A mature ovule includes the embryo sporophyte, its reserves of food, and the seed coat. This is collectively called:
a. a fruit b. a seed c. a spore d. the endosperm e. an ovary