You drive a nail into a tree that is 10 feet tall and come back 10 years later. The tree is now 30 feet tall, but the nail is the same distance from the ground. This is because primary growth of the tree is from the
A. lateral meristem.
B. intercalary meristem.
C. root tip.
D. node.
E. apical meristem.
E. apical meristem.
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Based on the ABC model, what would be the structure of a flower from the outermost whorl that had normal expression of genes A and C and expression of gene B in all four whorls?
A) carpelâ€"petalâ€"petalâ€"carpel B) petalâ€"petalâ€"stamenâ€"stamen C) sepalâ€"carpelâ€"carpelâ€"sepal D) sepalâ€"sepalâ€"carpelâ€"carpel E) carpelâ€"carpelâ€"carpelâ€"carpel
An earthquake decimates a ground-squirrel population, killing 98% of the squirrels. The surviving population happens to have broader stripes, on average, than the initial population. If broadness of stripes is genetically determined,
what effect has the ground-squirrel population experienced during the earthquake? A) directional selection B) disruptive selection C) a founder event D) a genetic bottleneck E) gene flow
Four of the five answers below are correct statements about gymnosperm reproduction. Select the exception
a. Pollen grains mature into mature male gametophytes. b. Sperm in gymnosperms are not flagellated. c. Sperm reach egg cells through a pollen tube. d. The zygote develops into a mature seed. e. Seed cones and pollen cones develop on separate trees.
The type of contraception that functions by preventing implantation, even after successful fertilization, is ____
a. tubal ligation b. spermicidal jelly c. birth control pills d. morning after pills e. diaphragm