Plant roots that are in a horizontal position grow down because
A. Cells on the upper side elongate more than those on the lower side.
B. Auxins are stimulating cells on the lower side to elongate more.
C. Auxins are being pulled to the upper side.
D. Auxins are having no influence on this process.
E. Statoliths are pushing auxins to the upper side.
A. Cells on the upper side elongate more than those on the lower side.
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A. Hyperacute B. Acute C. Chronic D. Accelerated
Autotrophs typically obtain their carbon from:
A. C6H12O6. B. ATP. C. CO2. D. CH4. E. CH3OH
The activities of cells in different layers of the tubular gastrointestinal tract are regulated by clusters of nerves located in the submucosa. These nerve complexes are called
A. villi. B. serosa. C. epithelia. D. plexuses. E. muscularis.
No single species concept functions well under all situations
a. true b. false