An aphid is an insect that has mouthparts to sip plant sap. When placed on an herbaceous stem, it soon has its mouthparts embedded and is withdrawing plant sap. Sometimes so much plant sap is taken that it cannot use all of it and the aphid secretes droplets of the sugar to attract ants that in turn protect and care for the aphids. What layer of cells has the aphid's mouthparts tapped?
What will be an ideal response?
phloem
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It is difficult to estimate when cyanobacteria appeared on Earth using evidence from the oxidation state of the Earth's crust, because
A) several abiotic reactions could have formed Fe3+. B) there are multiple forms of anoxygenic photosynthesis. C) there are multiple groups of oxygenic photosynthetic bacteria. D) several ancient anaerobic metabolisms form Fe3+.
Receptor adaption occurs when
A) impulse transmission stops at a synapse. B) the brain ignores the incoming action potentials. C) the stimulus stops. D) the sensory neuron stops sending action potentials. E) action potentials from multiple sensory neurons cancel one another.
The "stress hormone" involved in stomatal closure during water stress is:
a. abscisic acid. b. auxin. c. cytokinin. d. ethylene. e. gibberellin
Pyelonephritis usually is caused by
A) Pseudomonas aeruginosa. B) Proteus spp. C) Escherichia coli. D) Enterobacter aerogenes. E) Streptococcus pyogenes.