If a poplar forest is attacked by gypsy moths, how do the trees around the infected area tend to become somewhat resistant?
What will be an ideal response?
Plants that are attacked by insects tend to release hormones into the air to "warn" neighboring plants.
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A mature monocot seed is mostly
a. endosperm. b. starch. c. embryonic tissue. d. seed coat. e. more than one of these
Rings of muscle in the digestive tract that can open and close, regulating the movement of food into or out of parts of the digestive system, are
A. rumens. B. sphincters. C. chymes. D. villi. E. uvulas.
In an unstimulated neuron, the sodium-potassium pump maintains the concentration gradient of sodium and potassium ions by transporting
A) potassium ions out of and sodium ions into the cell. B) sodium and potassium into the cell. C) sodium and potassium out of the cell. D) sodium and potassium ions in both directions across the cell membrane. E) potassium ions into and sodium ions out of the cell.
Characteristics between the branch points of a cladogram that are shared by all organisms above the branch point and are not present in any below it are called
A. ancestral characters. B. novel characters. C. homoplastic characters. D. derived characters. E. homologous characters.