An opening in the epidermis of the leaf through which water evaporates is called a
A) stoma.
B) plasmodesmata.
C) guard cell.
D) pit.
E) sieve plate.
A
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An invertebrate statocyst contains ____, which surround movable ____; changes in body position move the latter,
triggering action potentials.
a. statoliths; sensory hair cells b. sensory hair cells; statoliths c. otoliths; sensory hair cells
d. efferent neurons; otoliths e. efferent neurons; statoliths
A(n) ____________ is a stony meteorite that contains no chondrules and no volatiles. They appear to have been melted after they formed and resemble solidified lavas
a. carbonaceous chondrite b. achondrite c. breccia d. Widmanstätten e. Kuiper belt object
The major function of a receptor is to
a. control the autonomic functions of the body. b. stabilize the internal environment to achieve homeostasis. c. produce responses to the various stimuli the body receives. d. give organisms or cells awareness of and sensitivity to their environment. e. do none of these.
Albinism is a recessive trait controlled by a single gene. If the frequency of albinos in a population is 0.25, what is the
expected frequency of heterozygotes for this trait? a. 0.25 b. 0.50 c. 0.75 d. 0.90 e. 1.00