Chemicals released by plants to inhibit germination and establishment of other species is known as
A) consumption.
B) allelopathy.
C) toxicopathy.
D) competitive exclusion.
B
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A student set up an experiment to test if plants give off water vapor. Fifty pea plants, growing in pots, were covered with individual glass containers and left overnight. The next morning, the inside of each lid was covered in droplets of water. The lab student concluded that plants generally give off water vapor. What critique would you make of the experimental design?
A. There was no control so the water could have come from other sources such as air in the jar or the soil. B. There was not a large enough sample of pea plants used to get adequate data. C. The student did not have a clearly stated hypothesis before beginning the experiment. D. The experiment was not precise, meaning it was not reproducible.
Which of the following statements about hydrostatic skeletons is true?
a. Compression of fluids causes movement of an animal body. b. Hydrostatic skeletons permit very precise and delicate movements. c. Fluid is moved throughout an organism due to alternating contractions of antagonistic muscles. d. Contraction of the inner circular muscles causes the body of an organism to shorten. e. Contraction of the outer longitudinal muscles causes the body of an organism to lengthen.
Homo habilis differed from australopithecines in terms of
A. brain volume. B. longer arm length than leg length. C. stature. D. skeletal structure.
The most common form of reproduction among prokaryotes is (budding/binary fission/snapping division).
Fill in the blank(s) with the appropriate word(s).