Ovules develop within the ovary, which is located in the swollen lower portion of which floral organ?
A. Stamen
B. Pistil
C. Anther
D. Filament
E. Stigma
Answer: B
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What is the approximate size of the human population today?
A. 7 billion people B. 2 billion people C. 5 billion people D. 10 billion people E. 25 billion people
A high-pitched sound is characterized by
A. a short wavelength and high frequency. B. a short wavelength and low frequency. C. a long wavelength and high frequency. D. a long wavelength and low frequency. E. a very long wavelength and very low frequency.
The preferred preventative measure for polio in the United States is the
A. inactive vaccine developed by Albert Sabin. B. oral, active vaccine developed by Albert Sabin. C. oral, active vaccine developed by Jonas Salk. D. inactive vaccine developed by Jonas Salk. E. No preventative measures are used because polio has been eradicated in the United States.
The herbicides (weed killers) 2,4-D and 2,4,5-T are examples of synthetic:a
abscisic acid. b. auxins.
c. cytokinins. d. ethylene. e. gibberellins.