A leaf primordium is initiated as a small mound of tissue on the flank of a dome-shaped shoot apical meristem. The earliest physical evidence of the site of a newly forming leaf primordium would be
a. development of chloroplasts in a surface cell of the shoot apical meristem.
b. cell division in the shoot apical meristem with the newly forming walls perpendicular to the surface of the meristem.
c. preprophase bands parallel to the surface of the meristem in subsurface cells of the shoot apical meristem.
d. elongation of epidermal cells perpendicular to the surface of the shoot apical meristem.
e. formation of stomata in the epidermal layer of the shoot apical meristem.
Ans: c. preprophase bands parallel to the surface of the meristem in subsurface cells of the shoot apical meristem.
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The Environmental Protection Agency
a. regulates the agricultural application of chemicals. b. has called for further study on the effects of atrazine on amphibians. c. now encourages farmers to minimize the runoff of atrazine-laden water from fields. d. does all of these. e. does none of these.
Suppose a population splits into two descendant populations prior to any evolution of dark coloration, then splits again after the evolution of dark coloration. What is the scientific term used for this situation?
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