The gaseous plant hormone is
a. auxin.
b. gibberellin.
c. cytokinin.
d. abscisic acid.
e. ethylene.
Answer: e
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Answer the following statements true (T) or false (F)
1. One gram of hydrogen, which has an atomic mass of 1, would have fewer atoms than 1 gram of carbon that has an atomic mass of 12. 2. Isotopes are different forms of the same element. 3. Sulfur 35 (35S) is an isotope of 32S. These elements differ in their number of neutrons. 4. Helium is an inert gas that rarely reacts with other elements because it has the maximum number of valence electrons in its outer shell.
Lizards that eat flies they catch on the ground and birds that catch and eat flies in the air are engaged in _____ competition
a. exploitative d. interspecific b. interference e. both exploitative and interspecific c. intraspecific f. both interference and intraspecific
Four of the five answers listed below are true of a neuron at resting potential. Select the exception
a. The interior of a neuron is positive. b. The interior of a neuron has a negative charge. c. There are more sodium ions outside a neuron. d. There are more potassium ions inside a neuron. e. The membrane of a neuron is polarized.
Diploblastic animals, such as cnidarians and ____, have only two germ layers, ectoderm and ____
a. sponges; ectoderm b. sponges; mesoderm c. ctenophores; mesoderm d. ctenophores; endoderm e. ctenophores; metaderm