A team of scientists has devised a new chemical fertilizer that its members believe will increase crop yields. The team planted three garden plots with corn. The soil was similar in each, and equal amounts of water were applied to each plot. One plot was treated with a common commercial fertilizer, another was treated with the new fertilizer, and the third plot was not given any fertilizer. The experimenters measured yields as bushels of corn from each plot. The plot that did not receive fertilizer was the __________.
Fill in the blank(s) with the appropriate word(s).
Answer: control plot
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Which layer of the endometrium is the functional layer and what does it do?
A. the outermost layer, basal layer of reproducing cells B. the innermost layer, grows in thickness during the uterine cycle C. the outermost layer, grows in thickness during the uterine cycle D. the middle layer, sheds frequently to maintain a healthy lining for implantation E. the innermost layer, basal layer of reproducing cells
The organism that Mendel used for his experiments was
A) E. coli. B) the fruit fly. C) maize. D) yeast. E) the pea plant.
Although all of the cells in your body contain a complete set of DNA, different types of cells arise because__________.
a) different genes are switched on and off in each type of cell b) the contain different chromosomes c) they contain different genes d) none of the above
The pores through which leaves exchange gases with the atmosphere are
A. epidermal cells. B. sieve tube elements. C. guard cells. D. petioles. E. stomata.