Was this a pre-mating or post-mating barrier?
a. pre-mating barrier, because individuals do not mate
b. post-mating barrier, because hybrids are produced but they do not reproduce
c. pre-mating barrier, because fertilization occurs but the hybrids are not viable
d. post-mating barrier, because hybrids are sterile and unable to mate
B
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At night, the stomata of most plants will ________
a. regulate the diffusion of nitrogen b. open c. close d. close to prevent the loss of oxygen from the leaf e. regulate the diffusion of carbon dioxide
Which of the following was the likely origin of chloroplasts?
a. cyanobacteria b. mitochondria c. extremophiles d. prokaryotes
Bacteriophages decrease food safety
____________________ Indicate whether the statement is true or false.
One method plants use to obtain phosphorus when it is in limited supply is
A. by roots adhering to soil particles. B. by roots growing deeper in the ground. C. by roots binding the phosphorus. D. by roots using passive uptake methods. E. by roots associating with certain fungi.