The Jones family has a plan to encourage good behavior in their children. When a child completes daily chores, that child receives a gold star. The earning of fourteen gold stars allows the child to choose between a visit to the movie theatre or the park. This is an example of
b. operant conditioning.
c. insight learning.
d. classical conditioning.
Which of the following statements about mycorrhizae is/are true?
a. Fungi may enter the cortex of plant roots but do not enter the cytoplasm of plant cells.
b. Plants are harmed, while fungi benefit.
c. The presence of the fungi give plants a greater absorptive surface for the intake of minerals.
d. All of the above are true.
e. All statements are true except that plants are harmed, while fungi benefit.
Which of the following structures is a male reproductive structure?
c. pollen cone
The lymphoid organ in which B lymphocytes are produced is the
a. red bone marrow.
b. lymph nodes.
d. thymus gland.
e. All of these produce B lymphocytes.
A _______ consists of all the populations of multiple species interacting in a designated region.
d. None of the choices are correct.
The cell responsible for producing a rapid antibody response against a foreign protein when it is encountered years after the first encounter is a
a. memory B cell.
b. memory T cell.
c. killer T cell.
d. plasma cell.
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